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Sample records for henares river bassin

  1. The impact of waste waters released into the river Henares in the vicinity of Guadalajara-Azuqueca (Spain); Impacto de los vertidos al rio Henares en el tramo Guadalajara-Azuqueca

    Energy Technology Data Exchange (ETDEWEB)

    Loeches, J.L.; Aguilar, M.V.; Martinez Para, M.C. [Dpto. de Nutricion y Bromatologia, Facultad de Farmacia, Universidad de Alcala de Henares (Spain); Lucas, J.; Hernandez, D. [Laboratorio Delegacion Provincial de Sanidad de Guadalajara (Spain)

    1997-06-01

    This work completes a study about the impact of urban and industrial inputs on the water quality of Henares river, in the stretch Guadalajara-Azuqueca de Henares. The study was made in 1993, between February and December. In general the content of metals in inputs and collectors is low due to the most of industries have treatment system previous to empty to general collectors. Limits for these metals are not exceeded by any sample water. The data obtained prove the non influence of urban and/or industrial waste on the water quality. (Author)

  2. UN MODELO DE CUADERNO DE CAMPO PARA UNA EXCURSIÓN GEOGRÁFICA POR LA CUENCA DE LOS RÍOS JARAMA Y HENARES

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    Clemente Herrero Fabregat

    2005-12-01

    Full Text Available RESUMENLas excursiones son un instrumento para que el estudiante construya su conocimiento geográfico mediante una metodología activa en la que la observación directa constituye un factor fundamental. Esta observación debe ser encauzada mediante cuadernos de campo en los que se debe ir anotando una serie de observaciones, comparaciones, conclusiones que permitan un conocimiento activo del medio geográfico y social. En este artículo se pone como modelo un trabajo de campo sobre La cuenca del río Henaresy y el borde meridional de Somosierra, con una visita al pueblo de Patones.PALABRAS CLAVE:Excursión geográfica, Observación directa, Cuaderno de Campo, Cuenca del río Henares, Borde meridional de Somosierra, Patones. SUMMARY:Excursions are a way for the improvement of the student's geographical knowledge. Direct observation is the main factor in this active methodology. This observation should be documented using field notebooks, in which findings, comparisons and conclusions should be registered, so an active knowledge of the social and geographic media could be reached. In this paper, a model con- cerning a field work on the Henares River Basin and the southern limit of Somosierra (including a visittoPatonestown isproposed. KEY WORDS:Geographic excursion, Direct observation, Field notebook, The Henares River basin, Southern limit of Somosierra, Patones town.RESUMÉLes excursions sont un instrument pour que I'étudiant construise sa connaissance géographique par une méthodologie active dans laquelle l'observation directe constitue un facteur fondamental. Cette observation doit etre acheminée au moyen de cahiers de domaine dans lesquels elle doit annoter une série d'observations, comparaisons, conclusiones qui permettent une connaissance active du milieu géographique et social. Dans cet article on met comme modele un travail de domaine sur le bassin de la riviere Henares et et le bord méridional de Somosierra, avec une visite au

  3. Gouvernance communautaire des milieux humides du bassin ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Gouvernance communautaire des milieux humides du bassin versant de la Sand River (Afrique du Sud). La collectivité de Craigieburn, dans la province du KwaZulu-Natal, en Afrique du Sud, est située dans un milieu humide couvrant 1 200 ha et jouant un rôle de premier plan dans la régulation et le maintien de la Sand ...

  4. LOS ENTERRAMIENTOS DE “LA DEHESA” (ALCALÁ DE HENARES, MADRID. ESTUDIO ANTROPOLÓGICO

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    Elena Marinas Díez

    2017-02-01

    Full Text Available El yacimiento de “La Dehesa” (Alcalá de Henares, Madrid, excavado en la década de los 90 del siglo pasado, es un yacimiento de “campo de hoyos” datado mediante materiales en la fase Protocogotas. En él se encontraron siete enterramientos, de los que se ha podido llevar a cabo el estudio antropológico de cinco de ellos. Del estudio se han podido extraer datos relativos al sexo, la edad, la estatura y patologías de los individuos, que en alguno de los casos han sido de gran interés.

  5. Alcalá de Henares medieval. Aspectos de su geografía urbana

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    Román Pastor, Carmen

    2004-09-01

    Full Text Available The mediaeval Alcalá de Henares, some sights of its urban geography. This article shows the evolution of Alcalá de Henares from its origins to the cisneriana reform. It focuses on the old primitive of San Justo and its following expansion, foundation of the modem city. Due to plenty of evidences from XVth century, this period of time has been studied more deeply: toponymy of some streets has been documented, and town planning has been anlysed. This urban design shows the town in several quarters, according to the different religions —Christian, Islamic and Jew— of their in habitants.

    El artículo presenta la trayectoria urbana de esta antigua población, desde sus orígenes tardorromanos hasta la intervención cisneriana, destacando sobre todo la primitiva villa de San Justo y su expansión posterior, base y fundamento de la ciudad actual. Gracias a una mayor abundancia de testimonios, hemos podido realizar un estudio más extenso del siglo XV alcalaíno; habiendo documentado la toponimia de algunas de sus calles y analizado su trazado viario, en el que se ha resaltado su fragmentación en barrios como consecuencia del establecimiento de los diversos grupos que vivían en la villa, cristianos, mudéjares y judíos.

  6. Análisis multitemporal del urbanismo expansivo en el corredor del Henares. Aportación de las imágenes de satélite

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    García Rodríguez, María Pilar

    2014-12-01

    Full Text Available The aim of this study is to analyze the evolution of soil sealing in an area with high human pressure affected by the “border effect” of proximity to a big city. It is also important to analyze the type and quality of the soil that is affected by this process. We have used Landsat (TM and ETM+ and Spot satellite images, selecting those treatments that allow better discrimination of degraded soils. Soil sealing between 1989 and 2002 mainly affected the Henares River valley and the lower terraces, waterproofing soils of high and medium agricultural quality, corresponding here to fluvisoles and cambisols. Between 2002 and 2011, the sealing of soils moved to higher terraces and the surface of the plain, especially affecting cambisols and, to a lesser extent, calcic and rendsic luvisols and leptosols. Thus, in the Henares Corredor region soil sealing between 1989 and 2011 increased by 6%, at the expense of irrigated and rainfed crops. The affected soils are luvisols, cambisols, fluvisols and leptosols.El objetivo del estudio es conocer la evolución del sellado del suelo en un área con alta presión antrópica afectada por el “efecto frontera” debido a su proximidad a una gran ciudad. Es importante analizar el tipo y calidad del suelo que está siendo afectado por este proceso. Para ello se utilizan imágenes de los sensores TM y ETM+ de los satélites Landsat e imágenes del satélite Spot seleccionando aquellos tratamientos que permiten una mejor discriminación de los suelos degradados. El sellado del suelo entre 1989 y 2002 afecta fundamentalmente a la vega del río Henares y las terrazas más bajas, impermeabilizando suelos de alta y media calidad agrológica, que corresponden aquí a fluvisoles y cambisoles. Entre los años 2002 y 2011 el sellado se desplaza a las terrazas más altas y a la superficie del páramo, actuando sobre todo en cambisoles y, en menor proporción, en luvisoles cálcicos y réndsicos y leptosoles. Por tanto, en

  7. Arquitectura y paisaje de la industria moderna en Alcalá de Henares

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    M. Ángeles Layuno Rosas

    2017-07-01

    Full Text Available El acelerado crecimiento industrial de municipios como Alcalá de Henares durante las décadas de los años 50 y 60 provocará radicales transformaciones en su morfología y paisaje urbanos, pero, a su vez, la identidad del municipio como ciudad industrial estimulará la aparición de una arquitectura moderna de la industria, símbolo del progreso industrial de la política económica del desarrollismo. Complejos fabriles cuya arquitectura sintetiza los debates internacionales sobre el proyecto industrial moderno en su doble vertiente formal y técnica. En este sentido, la arquitectura industrial de las décadas del desarrollismo supondrá una contribución realista y funcional a la recuperación de la arquitectura moderna en la España del momento.

  8. economía local: el corredor de Henares, España

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    Rubén Garrido Yserte

    2007-01-01

    Full Text Available Los impactos económicos de la Universidad de Alcalá de Henares son variados y de gran alcance, y se derivan tanto de la creación de conocimiento, investigación y desarrollo (efectos desde el lado de la oferta o bien de los efectos directos e indirectos de los flujos de gastos en el entorno local (efectos desde el lado de la demanda. Este documento sintetiza los resultados de un estudio del impacto económico de la Universidad de Alcalá en la economía local. En otras palabras, muestra las cifras principales que ilustran sobre cuál ha sido el incremento de la actividad económica local/regional –en términos de gastos locales y empleos locales generados- atribuible a la presencia de la Universidad de Alcalá

  9. Miami, capitale du Bassin caraïbe?

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    Christian Girault

    2003-12-01

    Full Text Available La métropole de Miami est devenue en l’espace de deux décennies la principale porte d’entrée des États-Unis vers le Bassin caraïbe. Elle a largement supplanté quelques villes rivales. Mais elle devra encore franchir quelques étapes avant d’être sacrée «capitale du Bassin caraïbe».

  10. Spatial dimension changes in second hand housing prices in Alcalá de Henares and León (Spain

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    María J. González González

    2014-06-01

    Full Text Available The objective of this study is to show different recent trends (2001-2009 in second-hand housing prices in Spain and in different neighbourhoods in Alcala de Henares and León, both of which are cities with very diverse economic and demographic characteristics. The first is a city in the metropolitan area of Madrid, with high land prices. The increasing demand for housing in Alcala de Henares is a good alternative for households, in view of high prices in Madrid. The second is Léon, the capital of the province of León, which is undergoing a depopulation process. We will demonstrate that house price dynamics is a local phenomenon and national or regional level data conceal interesting differences within cities (districts and neighbourhoods. The latest rise and decline in housing prices is clearly visible on the outskirts and sometimes non-existent in the town centre area.

  11. Long term variations measurement of electromagnetic field exposures in Alcalá de Henares (Spain).

    Science.gov (United States)

    Sánchez-Montero, R; Alén-Cordero, C; López-Espí, P L; Rigelsford, J M; Aguilera-Benavente, F; Alpuente-Hermosilla, J

    2017-11-15

    Electromagnetic radiowave exposure is a major concern in most countries due to possible adverse health effects. Over the last 10years, many technological changes (digital television, mobile technologies, wireless networks…) have led to variations in the electromagnetic field (EMF) levels. A large number of studies devoted to the analysis of EMF levels with personal dosimeters or computer models of the exposure of mobile stations have been conducted. However, the study of the exposure values, taking into account all the existing sources, and their evolution in a wide area, using measurements, has rarely been performed. In this paper, we provide a comparison of the EMF exposure levels for the city of Alcalá de Henares (Spain) over a ten-year period using a broadband isotropic probe in the range from 100kHz to 3GHz. A statistical and spatial analysis of the measurements and their variations are also presented for the study of the global and local variations. The measured values in the period from 2006 to 2015 were ranging from 0.02 to 2.05V/m. Our global results show a moderate increase from 2006 to 2010 and they are almost invariant from 2010 to 2015. Although the whole dataset does not have relevant statistical difference, we have found marked local differences. In the city areas where the population density has remained unaltered, we have measured lower exposure levels. Conversely, new urban and industrial developments have demanded new resources, which have potentially contributed to the observed increase in the measured electric field levels within these areas. Copyright © 2017. Published by Elsevier B.V.

  12. La cogestion des bassins versants transfrontaliers, pour favoriser la ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Les chercheurs feront fond sur l'expérience d'Agua Sustentable afin d'élaborer des méthodes rigoureuses et novatrices pour consigner l'utilisation et la gestion de l'eau par les autochtones et pour anticiper les conséquences des décisions politiques sur les populations vivant sur le territoire du bassin versant du río Mauri, ...

  13. Rehabilitación integrada de Alcalá de Henares. El patrimonio histórico como impulsor social y urbano. (España

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    Clemente San Román, Carlos

    1988-10-01

    Full Text Available Alcalá de Henares, 1988 International Price of the European Community in the Year of the Environment for its recuperation concerning territory, urbanism, balanced architecture and society, is getting also the recuperation and restoration of several important buildings, following here the programs and works already done, which reassure the definite recuperation of historic and present University City of Alcalá.

    Alcalá de Henares, Premio Internacional 1988 de las Comunidades Europeas en el Año del Medio Ambiente por su equilibrada recuperación entre territorio, urbanismo, arquitectura y sociedad, está consiguiendo además la recuperación y restauración de numerosos e importantes edificios de los que aquí se exponen la programación y obras ya realizadas, que aseguran la recuperación definitiva de la histórica y actual Ciudad Universitaria de Alcalá.

  14. Gestion de l'eau de consommation et de la pollution dans le bassin ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Gestion de l'eau de consommation et de la pollution dans le bassin versant de Yitenga, Burkina Faso - Phase II. La première phase de ce projet, 102474 Collectif de praticiens en écosanté (Afrique subsaharienne), portait sur l'étude des risques de maladies diarrhéiques ou leur recrudescence dans la zone du bassin ...

  15. Annual and seasonal variability of metals and metalloids in urban and industrial soils in Alcalá de Henares (Spain)

    Energy Technology Data Exchange (ETDEWEB)

    Peña-Fernández, A. [Departamento de Ciencias Biomédicas, Unidad de Toxicología, Universidad de Alcalá, Crta. Madrid-Barcelona Km, 33.6, 28871 Alcalá de Henares, Madrid (Spain); Lobo-Bedmar, M.C. [Instituto Madrileño de Investigación y Desarrollo Rural Agrario y Alimentario (IMIDRA), Finca el Encín, Crta. Madrid-Barcelona Km, 38.2, 28800 Alcalá de Henares, Madrid (Spain); González-Muñoz, M.J., E-mail: mariajose.gonzalez@uah.es [Departamento de Ciencias Biomédicas, Unidad de Toxicología, Universidad de Alcalá, Crta. Madrid-Barcelona Km, 33.6, 28871 Alcalá de Henares, Madrid (Spain)

    2015-01-15

    Contamination of urban and industrial soils with trace metals has been recognized as a major concern at local, regional and global levels due to their implication on human health. In this study, concentrations of aluminum (Al), arsenic (As), beryllium (Be), cadmium (Cd), chromium (Cr), manganese (Mn), nickel (Ni), lead (Pb), tin (Sn), thallium (Tl), vanadium (V) and zinc (Zn) were determined in soil samples collected in Alcalá de Henares (Madrid, Spain) in order to evaluate the annual and seasonal variation in their levels. The results show that the soils of the industrial area have higher metals concentrations than the urban area. Principal component analysis (PCA) revealed that the two principal sources of trace metal contamination, especially Cd, Cu, Pb, and Zn in the urban soils of Alcalá can be attributed to traffic emissions, while As, Ni and Be primarily originated from industrial discharges. The seasonal variation analysis has revealed that the emission sources in the industrial area remain constant with time. However, in urban areas, both emissions and emission pathways significantly increase over time due to ongoing development. Currently, there is no hypothesis that explains the small seasonal fluctuations of trace metals in soils, since there are many factors affecting this. Owing to the fact that urban environments are becoming the human habitat, it would therefore be advisable to monitor metals and metalloids in urban soils because of the potential risks to human health. - Highlights: • Anthropogenic activities may affect the seasonal metal variation in Alcalá's soils. • Weather characteristics may also influence the seasonal metal variation in soils. • Alcalá's continual urban growth may have increased the levels of metals in its soils. • Metal variability in Alcalá's industrial soils might be dependent on their sources. • High soil metal content might make it difficult to identify temporal variation.

  16. Gestion intégrée des ressources en eau dans le bassin versant du ...

    African Journals Online (AJOL)

    Le développement des ressources en eau du sous-bassin du lac municipal de Dschang suscite un intérêt croissant. En prélude à l'élaboration d'une stratégie de gestion durable de l'eau du sous-bassin, un état de lieux a été réalisé et les effets des variations climatiques sur les ressources en eau analysés. Les données ...

  17. Alcázar-Palacio Arzobispal de Alcalá de Henares : pasado, presente y futuro de un Monumento Nacional en una Ciudad Patrimonio de la Humanidad

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    Abraham Consuegra Gandullo

    2011-01-01

    Full Text Available El Alcázar Arzobispal es uno de los edificios más importantes del casco antiguo de Alcalá de Henares, declarado éste último Conjunto Histórico-Artístico desde el 10 de junio de 1968 y Patrimonio de la Humanidad desde el 2 de diciembre de 1998. El palacio se convirtió en uno de los mayores exponentes del arte medieval, renacentista, barroco y contemporáneo español, lo cual conllevó a su declaración como Monumento Nacional desde el 4 de junio de 1931. Este artículo incluye una mirada a su glorioso pasado, a su incendio y destrucción acaecida el 11 de agosto de 1939, a su posterior restauración y rehabilitación para comprobar la puesta en valor de un monumento único, y a su futuro para proseguir en la tarea de recuperación con su musealización e interpretación.Archiepiscopal Fortress is one of the most important buildings in Alcala de Henares city centre, which was designated a Historic-Artistic Grouping in June 10, 1968, and a World Heritage Site in December 2, 1998. Palace is one of the best examples of Middle Age, Renaissance, Baroque and Contemporary Spanish Arts, which led to its designation as a National Monument in June 4, 1931. This article provides a view of its glorious past, its fire and destruction occurred on August 11, 1939, and its further restoration and renovation. It is currently an unique monument with a solid future based on the continuous efforts to turn it into a museum and provide an interpretation center.

  18. Les effets du changement climatique dans le bassin du Congo : la ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    22 avr. 2016 ... Dans le bassin du fleuve Congo, plus de 80 % des habitants vivent exclusivement de l'agriculture, de la pêche, de l'élevage et de la cueillette, qui sont des activités largement tributaires du climat.

  19. Gestion de l'eau de consommation et de la pollution dans le bassin ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Gestion de l'eau de consommation et de la pollution dans le bassin versant de Yitenga, Burkina Faso - Phase II. La première phase de ce projet, 102474 Collectif de ... Management of Water for Consumption and Pollution in the Yitenga Basin, Burkina Faso - Phase II. The first phase, funded under the project, 102474 ...

  20. 66 Le remplissage sédimentaire du bassin de Timgad et aquifères ...

    African Journals Online (AJOL)

    PR BOKO

    Afrique SCIENCE 09(3) (2013) 66 – 76. 66. Djaiz FOUAD et al. Le remplissage sédimentaire du bassin ... économique (eau, hydrocarbures et matériaux de construction). Il représente un potentiel hydrique important. ... utilisant des moyens d'investigations plus appropriés. Les nouvelles techniques dans les sciences de la.

  1. Modelización de la contaminación difusa por nitratos en las aguas subterráneas de la cuenca del río Henares

    OpenAIRE

    Díaz Lezcano, Maura Isabel

    2011-01-01

    El Modelo Henares, es un modelo de simulación compuesto por dos módulos: CONTASUB e HIDROSUB. Ha sido programado para determinar la evolución de la contaminación difusa en las aguas subterráneas de la cuenca del río Henares, efecto de la aplicación de fertilizantes nitrogenados en los usos agrícolas de los terrenos de la cuenca. Además, podría ser adaptado en el futuro a otras condiciones geográficas, climatológicas, geológicas, hidrogeológicas, de uso de la tierra, como las presentes en el á...

  2. La construcción con cerámica armada. Iglesia de San Juan de Ávila, en Alcalá de Henares/España

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    de Dios de la Hoz, J.

    1998-02-01

    Full Text Available San Juan de Avila, in Alcalá de Henares, Spain, is among the first buildings in Europe built by Eladio Dieste. It is a temple constructed with the technique of reinforced ceramics where the compression strength is bore by the brick masonry, while the reinforcement of the Joints allows bearing the traction strength and even favors the constructive system.

    La iglesia de San Juan de Ávila, en Alcalá de Henares, es uno de los primeros edificios construidos por Eladio Dieste en Europa. Se trata de un templo levantado con la técnica de cerámica armada en la cual se confía la resistencia a compresión a la fábrica de ladrillo, mientras que las armaduras de las juntas permiten resistir las tracciones e, incluso, favorecer el sistema constructivo.

  3. Le bassin transfrontalier du fleuve Zambèze en Afrique australe: des eaux conflictuelles?

    OpenAIRE

    Maupin, Agathe

    2012-01-01

    L’accord de 2004 sur la création de la commission de bassin transfrontalier du Zambèze devait obtenir les six ratifications des huit États riverains qui sont requises pour son entrée en vigueur dans le bassin du fleuve Zambèze. Le Zimbabwe, la Tanzanie et le Malawi ont fait durer cet événement durant six ans. La Zambie, qui n’a ni signé, ni ratifié l’accord, risque aujourd’hui d’être contrainte par cette majorité. Il est intéressant de revenir sur les tensions autour de la gestion des ressour...

  4. 35 Typologie des eaux de surface du bassin du Sebou par multi ...

    African Journals Online (AJOL)

    PR BOKO

    Résumé. L'étude consiste en l'utilisation de la démarche biologique, particulièrement les indices IBGN et IBG-RCS, pour montrer l'évolution de la qualité biologique des eaux de surface du bassin du Sebou dans la période. 2009-2011. La caractérisation physicochimique/microbiologique de la qualité des eaux de surface ...

  5. THE UNIVERSITY OF ALCALA DE HENARES (MADRID, SPAIN, AS A DYNAMIC EXAMPLE AND LABORATORY OF THE RECOVERY, REHABILITATION, AND CONSERVATION OF THE CULTURAL HERITAGE

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    E. Echeverría Valiente

    2013-07-01

    Full Text Available Cardinal Cisneros launched in 1499 a major universitary project, that was located in Alcala de Henares (Madrid, Spain. It bestowed recently the recognition of the Council of Europe as a World Heritage Site in 1998 by UNESCO. Cisneros created the new university in the vicinity of the Roman town of Complutum. This site had two qualities which were particularly important: it was placed at a safe distance from the power of the Crown at Toledo, and it was well connected with other main Spanish cities, through the Roman road or calzada that crossed the Iberian peninsula from South to North going along some important settlements as Mérida, Toledo, Zaragoza, and Barcelona. Thus the old town of Alcala de Henares still keeps the remains of the Visigothic, Roman, Muslim and Hebrew cultures. Since the end of the fifteenth century the built Renaissance complex has gone through three clear stages, where lots of relevant architects developed their work. Among them, Pedro Gumiel and Rodrigo Gil de Hontañón can be cited for their first drawings, but other anonymous architects have also contributed to build such an interesting project. In a second stage some repairs were needed on the former structures, in order to adapt them to their new functions due to deterioration or even to changes in ownership or uses (as happened to the Colegio Mayor de San Ildefonso. Finally, at the latest stage at the end of the 20th and the early 21st centuries a new regeneration project took place in order to introduce the modern technologies and energy-efficient standards the old universitary buildings. An interesting example of this modern practices on dynamic conservation of the historical heritage is the new Learning and Research Center (LRC on the ruins of San Diego headquarter built in 1859 on the site of the Franciscan convent of Santa Maria de Jesus, founded in 1445 by Archbishop Alonso Carrillo (which in turn it replaced an earlier one. The aims of the new LRC are to

  6. The University of Alcala de Henares (madrid, Spain), as a Dynamic Example and Laboratory of the Recovery, Rehabilitation, and Conservation of the Cultural Heritage

    Science.gov (United States)

    Echeverría Valiente, E.; da Casa Martín, F.; Celis D'amicoa, F.; Navarro, P. C.

    2013-07-01

    Cardinal Cisneros launched in 1499 a major universitary project, that was located in Alcala de Henares (Madrid, Spain). It bestowed recently the recognition of the Council of Europe as a World Heritage Site in 1998 by UNESCO. Cisneros created the new university in the vicinity of the Roman town of Complutum. This site had two qualities which were particularly important: it was placed at a safe distance from the power of the Crown at Toledo, and it was well connected with other main Spanish cities, through the Roman road or calzada that crossed the Iberian peninsula from South to North going along some important settlements as Mérida, Toledo, Zaragoza, and Barcelona. Thus the old town of Alcala de Henares still keeps the remains of the Visigothic, Roman, Muslim and Hebrew cultures. Since the end of the fifteenth century the built Renaissance complex has gone through three clear stages, where lots of relevant architects developed their work. Among them, Pedro Gumiel and Rodrigo Gil de Hontañón can be cited for their first drawings, but other anonymous architects have also contributed to build such an interesting project. In a second stage some repairs were needed on the former structures, in order to adapt them to their new functions due to deterioration or even to changes in ownership or uses (as happened to the Colegio Mayor de San Ildefonso). Finally, at the latest stage at the end of the 20th and the early 21st centuries a new regeneration project took place in order to introduce the modern technologies and energy-efficient standards the old universitary buildings. An interesting example of this modern practices on dynamic conservation of the historical heritage is the new Learning and Research Center (LRC) on the ruins of San Diego headquarter built in 1859 on the site of the Franciscan convent of Santa Maria de Jesus, founded in 1445 by Archbishop Alonso Carrillo (which in turn it replaced an earlier one). The aims of the new LRC are to, preserve and

  7. Políticas públicas y factores que determinan la competitividad turística de Morelia, México y de Alcalá de henares, España

    OpenAIRE

    Rubén Molina Martínez; Melissa Ochoa Galván; Casimiro Leco Tomás

    2014-01-01

    En este artículo se aborda el análisis de la competitividad turística para las ciudades de Morelia, México y Alcalá de Henares, España, partiendo de los aspectos conceptuales sobre turismo, competitividad turística, políticas públicas, inversión extranjera directa y marketing turístico. Se consideran los recursos culturales y los recursos humanos como factores determinantes de la competitividad turística para estas ciudades. Se exponen las principales teorías sobre competitividad turística y ...

  8. Dynamique de l'occupation du sol dans le bassin versant de l ...

    African Journals Online (AJOL)

    Les résultats de la dynamique d'occupation du sol dans le bassin en 1978, 1998 et 2010 a permis de constater une régression de la savane arborée et arbustive (-140094), de la forêt claire et de la savane boisée arborée (-443706), de la forêt galerie (-3071) et de la forêt dense(-20640) d'une part et une progression des ...

  9. River

    Directory of Open Access Journals (Sweden)

    Morel Mathieu

    2016-01-01

    Full Text Available The OECD report “Boosting Resilience through Innovative Risk Governance” examines the efforts of OECD countries to prevent or reduce future disaster impacts, and highlights several key areas where improvements can be made. International collaboration is insufficiently utilised to address shocks that have increasingly global consequences. Institutional design plays a significant role in facilitating or hampering the engagement and investments of governmental and non-governmental stakeholders in disaster risk prevention and mitigation. To inform the design of “better” institutions, the OECD proposes the application of a diagnostic framework that helps governments identify institutional shortcomings and take actions to improve them. The goal of the case study on the Rhone River is to conduct an analysis of the progress, achievements and existing challenges in designing and implementing disaster risk reduction strategies through the Rhone Plan from a comparative perspective across a set of selected countries of this study, like Austria and Switzerland, will inform how to improve institutional frameworks governing risk prevention and mitigation. The case study will be used to identify examples of successful practice taking into account their specific country contexts, and analyse their potential for policy transfer.

  10. Assurer la sécurité alimentaire et hydrique dans le bassin de l'Indus ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    L'Indus traverse le coeur du Pakistan, sillonnant montagnes, forêts et désert pour ensuite former un delta imposant. Ce bassin fluvial, l'un des principaux d'Asie du Sud, est aussi sujet aux inondations.

  11. Bassins – versants et décentralisation administrative : esquisse de comparaison France/Espagne

    Directory of Open Access Journals (Sweden)

    Sylvie Clarimont

    2004-10-01

    Full Text Available En France comme en Espagne, le bassin-versant devient le territoire de gestion de l’eau avant la mise en œuvre de mesures de décentralisation administrative. Son institutionnalisation est beaucoup plus précoce en Espagne (1926 qu’en France (1964. Confédérations hydrographiques et agences de bassin sont des établissements publics, placés sous tutelle ministérielle. Les premières sont créées pour améliorer la mobilisation de la ressource et son allocation dans un contexte d’augmentation de la demande. Les secondes doivent répondre aux problèmes croissants de pollution des eaux. Depuis les années 80, toutes deux sont confrontées à l’affirmation de collectivités territoriales dotées de compétences nouvelles en matière de gestion des eaux.

  12. Medicinal Plants Used for Neuropsychiatric Disorders Treatment in the Hauts Bassins Region of Burkina Faso

    Directory of Open Access Journals (Sweden)

    Prosper T. Kinda

    2017-05-01

    Full Text Available Background: In Burkina Faso, phytotherapy is the main medical alternative used by populations to manage various diseases that affect the nervous system. The aim of the present study was to report medicinal plants with psychoactive properties used to treat neuropsychiatric disorders in the Hauts Bassins region, in the western zone of Burkina Faso. Methods: Through an ethnobotanical survey using structured questionnaire, 53 traditional healers (TH were interviewed about neuropsychiatric disorders, medicinal plants and medical practices used to treat them. The survey was carried out over a period of three months. Results: The results report 66 plant species used to treat neuropsychiatric pathologies. Roots (36.2% and leaves (29% were the main plant parts used. Alone or associated, these parts were used to prepare drugs using mainly the decoction and the trituration methods. Remedies were administered via drink, fumigation and external applications. Conclusions: It appears from this study a real knowledge of neuropsychiatric disorders in the traditional medicine of Hauts Bassins area. The therapeutic remedies suggested in this work are a real interest in the fight against psychiatric and neurological diseases. In the future, identified plants could be used for searching antipsychotic or neuroprotective compounds.

  13. Políticas públicas y factores que determinan la competitividad turística de Morelia, México y de Alcalá de henares, España

    Directory of Open Access Journals (Sweden)

    Rubén Molina Martínez

    2014-12-01

    Full Text Available En este artículo se aborda el análisis de la competitividad turística para las ciudades de Morelia, México y Alcalá de Henares, España, partiendo de los aspectos conceptuales sobre turismo, competitividad turística, políticas públicas, inversión extranjera directa y marketing turístico. Se consideran los recursos culturales y los recursos humanos como factores determinantes de la competitividad turística para estas ciudades. Se exponen las principales teorías sobre competitividad turística y se abordaran las políticas públicas para el desarrollo del turismo. Para la obtención de los resultados se construyó un instrumento utilizando la escala Likert y posterior a su aplicación se muestra que la competitividad turística de Morelia, México está determinada particularmente por los recursos humanos, marketing turístico, políticas públicas e inversión extranjera directa; mientras que para la ciudad de Alcalá de Henares, España, la competitividad turística se encuentra determinada por el marketing turístico, políticas públicas, recursos culturales e inversión extranjera directa.

  14. Le Bassin caraïbe: interface et relais entre production et consommation de drogues

    Directory of Open Access Journals (Sweden)

    Olivier Dollfus

    2003-12-01

    Full Text Available Le développement accéléré de l’économie des drogues est un des aspects de la mondialisation des activités. Dans le Bassin caraïbe, au rôle essentiel dans l’approvisionnement du marché états-unien, l’espace des stupéfiants s’organise en réseaux complexes, cohérents, solidement structurés et contrôlés par un grand nombre d’acteurs, institutionnels et privés. La collusion entre les organisations criminelles et les pouvoirs établis favorise la déstructuration des

  15. Henares prawns: echoes and borders

    Directory of Open Access Journals (Sweden)

    Ángel Gómez Moreno

    2011-12-01

    Full Text Available Although its title focuses on one single verse of the Libro de Buen Amor, this note also pays attention to several ornithological and ichthyological species alluded by Juan Ruiz. Not by chance, those passages count among the most difficult for both editors and exegetes.

  16. Les nouvelles hiérarchies du système portuaire dans le Bassin Caraïbe

    Directory of Open Access Journals (Sweden)

    Colette Ranély Vergé-Dépré

    2008-04-01

    Full Text Available IntroductionDéfini comme l’ensemble des territoires qui bordent la Mer des Caraïbes et le Golfe du Mexique, le Bassin Caraïbe présente une densité portuaire élevée qui s’explique notamment par l’éclatement géographique de cet espace et par un fort degré d’extraversion de ces économies continentales et insulaires. Situé à proximité des grandes routes maritimes internationales qui relient les trois pôles de la Triade, le Bassin Caraïbe espère tirer profit d’une situation de carrefour redécouver...

  17. Analyse comparée de bassins sédimentaires transtensionnels : le bassin de Santa Rosalia (Basse Californie du Sud, Mexique et de Mendibelza (Pyrénées, France

    Directory of Open Access Journals (Sweden)

    Bourrouilh- Le Jan, F.

    2005-12-01

    Full Text Available Cet article présente un analyse comparée de bassins sédimentaires liés a l’ouverture en cours du Golfe de Californie, avec le bassin d’ouverture ancien, jurassico-crétacés de Mendibelza dans les Pyrénées occidentales par l’ouverture du Golfe de Gascogne. Ce travail est une contribution à la compréhension de la sédimentation et des contrôles de bassins transtensionnels situés sur des marges divergentes obliques actuelles, dans le but d’utiliser ces modèles et de les comparer, pour mieux comprendre et interpréter les bassins anciens créés dans des contextes géodynamiques analogues, mais qui sont tectonisés. Le fil directeur est l’analyse comparée de ces bassins : - dans leur évolution tectonique, leur modélisation géométrique et les contraintes auxquelles ils ont été soumis, - dans l’enregistrement sédimentaire (séquences des épisodes d’ouverture, des forçages tectoniques, climatiques et sédimentaires qui ont accompagné la naissance, l’évolution et la tectonisation de ces bassins (Mendibelza. Ainsi, le bassin de Santa Rosalia a enregistré les étapes d’évolution parallèles à la formation du rift oblique du Golfe de Californie depuis le Miocène supérieur suivant 3 séquences : T1 (Miocène supérieur-Pliocène inférieur représente la phase syn-rift constituée de faciès de fan-delta; T2 (Pliocène inférieur à moyen représente la transition du rifting-drifting, marquée par une rupture brusque de la sédimentation et constitué de faciès de fan-delta passant à plate forme; T3 (Pliocène supérieur-Pléistocène est un cortège de haut niveau marin, marquant une deuxième pulsation de la subsidence du bassin de Santa Rosalia pendant l’ouverture généralisée du Golfe de Californie. La formation de Mendibelza est constituée de 3 séquences : - la séquence inférieure K1 de l’Albien inférieur, formée de faciès de front-delta et pro-delta déposés pendant la phase Syn-rift. K2

  18. Géochimie organique du bassin de Paris Organic Geochemistry of the Paris Basin

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    Espitalie J.

    2006-11-01

    Full Text Available On présente ici les principaux résultats de l'étude géochimique réalisée, dans le bassin de Paris, à partir des déblais et des carottes provenant de 100 sondages pétroliers ou miniers, et des huiles prélevées dans les réservoirs du Mésozoïque (Trias, Bathonien supérieur, Néocomien. Les différentes méthodes géochimiques utilisées sont la pyrolyse, particulièrement bien adaptée à l'étude des nombreux échantillons de déblais recueillis, la chromatographie en phase gazeuse pour l'analyse détaillée des huiles et des extraits de roche, la spectrométrie de masse pour l'étude des biomarqueurs. Les époques principales de formation de l'huile et du gaz ont été déterminées par simulation sur ordinateur d'un modèle mathématique de genèse des hydrocarbures. Les méthodes de pyrolyse ont permis de dresser des logs géochimiques des forages étudiés et de déterminer, par le calcul, les paramètres de pyrolyse initiaux des roches-mères, avant leur enfouissement. On a pu ainsi établir, dans le périmètre étudié, des cartes de carbone organique initial, de potentiels pétroliers totaux et de quantités d'HC migrés. L'ensemble de ces résultats montre que les roches-mères de la grande majorité des huiles du Mésozoïque sont situées dans le Lias, s'échelonnant depuis le Toarcien jusqu'à l'Hettangien et que les meilleures zones de potentiel pétrolier du Bassin sont localisées à l'emplacement des régions de forte subsidence à l'époque du Lias. L'étude détaillée des hydrocarbures et celle des biomarqueurs ne permettent pas de distinguer les différentes huiles entre elles, quelle que soit leur profondeur, ni de leur attribuer une origine précise à partir des différents niveaux du Lias. Les cartes de migration mettent en évidence des déplacements latéraux des hydrocarbures dans certaines roches-mères (cas du Toarcien inférieur. Elles montrent aussi un déficit important en hydrocarbures à la base du

  19. Qualité chimique et biologique du bassin de la Semois (partie Belge

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    LECLERCQ L.

    1996-04-01

    Full Text Available Les eaux du bassin de la Semois belge ont été étudiées, en 25 stations, sous différents aspects complémentaires : chimie, diatomées et invertébrés benthiques. Les méthodes utilisées sont l'indice de pollution organique (IPO, LECLERCQ et VANDEVENNE, 1987, un indice diatomique (ID, LECLERCQ, non publié et l'indice biologique global normalisé (IBGN, AFNOR, 1992. Grâce aux analyses chimiques et diatomiques, nous décrivons différents types d'eaux naturelles, à minéralisation croissante, et différents niveaux de pollution et d'eutrophication. Nous présentons une carte d e qualité détaillée, à l'usage des gestionnaires. Les diatomées apparaissent comme les bioindicateurs les plus fiables pour ces paramètres. Les invertébrés sont moins intéressants à utiliser. Ils sont pratiquement insensibles au type de minéralisation de l'eau (tout au moins au niveau de la famille, qui est le seul niveau d'identification possible en routine, mais ces organismes peuvent être plus sensibles au facteur substrat qu'à la pollution organique, conduisant alors à des estimations erronées.

  20. Le Bassin caraïbe: lac états-unien ou méditerranée américaine?

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    Henry Godard

    2003-12-01

    Full Text Available Organisé autour du pôle majeur des États-Unis, le Bassin caraïbe se caractérise par des contrastes marqués entre ses rives septentrionale et méridionale et par l’intensité des flux qui le traversent. L’analyse des données relatives au tourisme de croisière et à l’évolution du trafic aérien dans le Bassin permet de confirmer ou d’infirmer la validité de ces deux concepts, lac ou méditerranée.

  1. Financial evaluation of the integration of satellite technology for snow cover measurements at a hydroelectric plant. (Utilization of Radarsat I in the La Grande river basin, Quebec); Evaluation financiere de l'integration de technologies satellitaires, pour le suivi du couvert nival, au sein d'une entreprise hydroelectrique. (Le cas de l'utilisation du satellite Radarsat I dans le bassin de la riviere La Grande, Quebec)

    Energy Technology Data Exchange (ETDEWEB)

    Martin, D.; Bernier, M.; Sasseville, J.L. [INRS-Eau, Sainte-Foy, Quebec (Canada) ; Charbonneau, R. [Hydro-Quebec, St. Hilaire, Quebec (Canada)

    1999-07-01

    The emergence, on the markets, of new technologies evokes, for the potential users, a lot of questions concerning the implementation and operation costs associated with these technologies. Nevertheless, for a lot of users, costs should be considered with the benefits these technologies are able to generate. The benefit-cost analysis is a useful tool for a financial evaluation of the transferability of the technology. This method has been selected to evaluate the eventual implementation of remote sensing technologies for snow cover measurements in the La Grande river basin (Quebec, Canada). Indeed, a better assessment of the snow water equivalent leads to a better forecasting of the water inputs due to the snowmelt. Thus, the improvement of the snow cover monitoring has direct impact on hydroelectric reservoir management. The benefit-cost analysis was used to compare three acquisition modes of the satellite Radarsat 1 (ScanSAR, Wide and Standard). The costs considered for this project are: R and D costs and operations costs (the purchase of images and costs of ground truth measurements). We evaluated the raw benefits on the basis of reducing the standard deviation of predicted inflows. The results show that the ScanSAR mode is the primary remote sensing tool for the monitoring of the snow cover, on an operational basis. With this acquisition mode, the benefit-cost ratios range between 2.3:1 and 3.9:1, using a conservative 4% reduction of the standard deviation. Even if the reduction is only 3%, ScanSAR remains profitable. Due to the large number of images needed to cover all the territory, the Standard and Wide modes are penalized by the purchase and the processing costs of the data and with delays associated to the processing. Nevertheless, with these two modes, it could be possible to work with a partial coverage of the watershed, 75% being covered in 4 days in Wide mod. The estimated B/C ratios (1.5:1 and 2:1) confirm the advantages of this alternative

  2. Potentialites hydrogeologiques du synclinal de kourimat (Bassin D'essaouira, Maroc

    Directory of Open Access Journals (Sweden)

    Laftouhi, N.

    2001-04-01

    Full Text Available The synclinal basin of Kourimat, situated in the oriental part of Essaouira basin, shelters an aquiferous carbonate. This aquiferous represents the unique resource in water for the region. The study undertaken on this aquiferous has allowed us the characterize it viewpoint hydrodynamically, hydrogeologically and hydrogeochimically. The piezometric map of the system shows a senses of water flow underground of the southeast to the northwest. The hydraulic gradient varies from the upstream to the downstream. The evolution of the piezometry at one time watch of annual and seasonal fluctuations in connection with variations of precipitations. The results of chemical analyses have allowed to distinguish two aquiferious: the first is Cenomanian, the second is Turonian. Theses aquiferious were diffrenciated by there chemical facies and the origine of chemicals elements.La cuvette synclinale de Kourimat, située dans la partie orientale du bassin d'Essaouira, abrite un aquifere carbonaté constituant l'unique ressource en eau de la région. L'étude entreprise sur cet aquifere a permis de le caractériser de point de vue hydrodynamique, hydrogéologique et hydrogéochimique. La carte piézométrique du systeme montre un sens d'écoulement global du sud-est vers le nord-ouest. Le gradient hydraulique varie de l'amont vers l'aval. Les fluctuations piézométriques montrent une bonne corrélation avec les aléas climatiques. Les résultas de l'étude hydrochimique ont permis de mettre en évidence l'existence de deux nappes: la premiere dans le Cénomanien et l'autre dans le Turonien. Ces deux nappes se différencient par leurs facies chimiques et par l'origine des éléments en solution.

  3. Sulfur bacteria in sediments of two coastal ecosystems: the Bassin d'Arcachon and the Etang du Prévost, France

    NARCIS (Netherlands)

    Schaub, B E M; van Gemerden, H

    1996-01-01

    Enumeration of the functional groups of sulfur bacteria was performed in the sediments in the Bassin d'Arcachon, a mesotidal lagoon with strong tidal currents and dominant populations of seagrass (Zostera noltii), and in the Etang du Prevost, a shallow lagoon with moderate tidal fluctuations and

  4. The buffering capacity towards free sulphide in sediments of a coastal lagoon (Bassin d'Arcachon, France) - the relative importance of chemical and biological processes

    NARCIS (Netherlands)

    Heijs, SK; Jonkers, HM; van Gemerden, H; Schaub, BEM; Stal, LJ

    The Bassin d'Arcachon (south-west France) was chosen as a model ecosystem to study the chemical and microbiological buffering towards free sulphide. Data were collected on the vertical distribution of oxygen, sulphur and iron compounds and the vertical distribution of colourless sulphur bacteria and

  5. The buffering capacity towards free sulphide in sediments of a coastal lagoon (Bassin d'Arcachon, France) - the relative importance of chemical and biological processes

    NARCIS (Netherlands)

    Heijs, S.K.; Jonkers, H.M.; van Gemerden, H.; Schaub, B.; Stal, L.J.

    1999-01-01

    The Bassin d'Arcachon (south-west France) was chosen as a model ecosystem to study the chemical and microbiological buffering towards free sulphide. Data were collected on the vertical distribution of oxygen, sulphur and iron compounds and the vertical distribution of colourless sulphur bacteria and

  6. UN OUTIL D’AIDE Á LA GESTION DE L’ANGUILLE : LE TABLEAU DE BORD ANGUILLLE DU BASSIN LOIRE

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    BAISEZ A.

    2005-10-01

    Full Text Available L’anguille européenne (Anguilla anguilla, L. est longtemps apparue comme une espèce commune, représentant une composante majeure des milieux littoraux et des eaux continentales. La prise de conscience de la diminution de son abondance est réelle et engendre l’émergence de processus de gestion. Ce constat situe l’enjeu du Tableau de Bord Anguille du Bassin Loire mis en place en avril 2002 sous l’égide du COmité de GEstion des POissons MIgrateurs du Bassin de la Loire, des Côtiers Vendéens et de la Sèvre Niortaise. Son objectif in fine est de contribuer à une gestion et à un développement durable de l’espèce et de ses habitats. Il vise à surveiller les caractéristiques des stocks locaux présents et des habitats disponibles au moyen d’une collecte régulière et objective de données synthétisées sous forme d’indicateurs de population et de milieu. Le concept, le fonctionnement actuel et les applications de ce tableau de bord sont ici présentés.

  7. Sédimentation et tectonique dans le bassin marin Eocène supérieur-Oligocène des Alpes du Sud Sedimentation and Tectonics in the Upper Eocene-Oligocene Marine Basin in the Southern Alps

    Directory of Open Access Journals (Sweden)

    Riche P.

    2006-11-01

    'exprime nettement moins que précédemment. Le toit des grès est marqué par une surface de discontinuité fortement érosive correspondant à des canyons sous-marins de direction NE-SO. Cette surface peut être mise en relation avec l'écoulement des olistostromes qui termine le remplissage du bassin. La mise en place de ces olistostromes et des olistolithes qui les accompagnent n'est pas paléontologiquement datée : elle débute avec la fin de la sédimentation gréseuse. L'ensemble est encore affecté par une distension E-O ce qui tend à montrer que cette mise en place est antérieure à la phase de serrage miocène. La confrontation entre les observations de terrain, les expériences de sédimentation en canal et l'interprétation sismique de bassins offshore argumente les interprétations proposées. This paper is based on local field surveys performed recently by Institut Français du Pétrole (IFP and Ecole Nationale Supérieure du Pétrole et des Moteurs (ENSPM in the western part of the southern Alps nummulitic basin, to help interpret seismic data. It underlines the role of extensional tectonics during sedimentation. It questions the geodynamic interpretation of the basin as a foredeep basin in the Alpine orogenic belt. On a Mesozoic basement folded by the Pyreneo-Provençale orogeny, as early as the Lutetian the nummulitic transgression flooded the eastern area, which was subsequently obscured by the Pennine main fault during Mio-Pliocene times. It spread westward during the Upper Eocene. In the meantime, an E-W extension, shown clearly along the Var River faults and along the edge of the Pelvoux range, fragmented the fringes of the basin with blocks tilted during sedimentation. The result is fast changes of facies within the basal carbonates, which pass from platform types to slope types and to thin gravitational sediments farther into the basin. The overlying marls correspond to slope facies wrapping the inherited topography. The Gres d'Annot s. l

  8. Rites corporatifs et stratégies d’entreprises dans le Bassin sidérurgique de Longwy

    OpenAIRE

    Charrasse, David

    2015-01-01

    Communication écrite Le sujet global de l’étude tel qu’il se présentera sous une forme achevée aura pour titre « Rites de la crise, crise des rites dans le Bassin sidérurgique lorrain ». Quel intérêt à introduire le concept de rite là où tout le monde perçoit celui de crise (monstre de boulimie sémiotique) ? D’une part parce que les deux termes se correspondent intimement, le rite étant toujours renvoyé à une crise possible, sa justification dernière étant en quelque sorte de la résoudre symb...

  9. La périurbanisation singulière de l’immobilier logistique du Bassin parisien

    Directory of Open Access Journals (Sweden)

    Nicolas Raimbault

    2012-08-01

    Full Text Available L'article présente les formes et les ressorts territoriaux de l'urbanisation produite par la construction d'immobilier logistique à l'échelle du Bassin parisien. L'anamorphose permet de représenter les zones d'accueil d'entrepôts et celles de tensions territoriales inhérentes à cet immobilier. La comparaison du cumul des constructions d'entrepôts avec celui des constructions de logements résidentiels individuels, entre 1999 et 2008, révèle une périurbanisation logistique caractérisée par un front urbain particulier. Cela conduit à l'hypothèse de l'existence de systèmes territoriaux spécifiques à l'accueil des entrepôts, à l'interface de logiques marchandes, sociales et politiques.

  10. Réponse équilibrée aux besoins en eau dans le bassin du Saïss au ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    21 avr. 2011 ... Pour ce faire, ils tentent de renforcer les échanges d'information et le dialogue entre les agriculteurs commerciaux, les petits exploitants, les gestionnaires des ressources en eau et les chercheurs eux-mêmes. L'équipe entend également, dans le cadre de discussions axées sur la gestion durable du bassin ...

  11. Le Bassin caraïbe: des contrastes nuancés au sein du tiers monde le plus développé

    Directory of Open Access Journals (Sweden)

    Thierry Hartog

    2003-12-01

    Full Text Available L’analyse des marqueurs démographiques et socio-économiques montre que le Bassin caraïbe, singulier par sa fragmentation physique, sociale, économique et politique, jouit d’une situation « privilégiée » par rapport aux autres sous-ensembles latino-américains. Les contrastes socio-spatiaux sont marqués.

  12. Caractérisation spatio-temporelle du régime pluviométrique du haut bassin du fleuve Sénégal dans un contexte de variabilité climatique

    Directory of Open Access Journals (Sweden)

    Alain Dezetter

    2011-07-01

    Full Text Available Les écoulements et par conséquent les ressources en eau constituent la réponse des bassins versants aux impulsions pluviométriques. En Afrique de l'Ouest et Centrale, on assiste depuis les années 1970 à une sécheresse sans précédent, ainsi qu'à une grande variabilité spatiale et temporelle des pluies, caractéristique du domaine tropical. L'objectif de ce travail est de définir la variabilité spatio-temporelle des précipitations à l'échelle du haut-bassin du fleuve Sénégal à partir des données de dix stations de référence. Le choix des stations obéit à des critères de qualité des données (lacunes peu nombreuses et de proximité avec le bassin versant. Dans un premier temps, des tests statistiques d'homogénéité ont été appliqués aux séries de pluies annuelles de l'origine des stations à 2005. Les séries analysées présentent toutes des ruptures. Sur les dix stations étudiées, huit présentent une rupture comprise entre 1960 et 1970 et les déficits ultérieurs varient entre 12 et 24 %. À l'échelle mensuelle, après reconstitution des données manquantes, il apparaît que les précipitations ont diminué significativement pour presque tous les mois entre les deux périodes. À l'échelle journalière, l'analyse des fractions pluviométriques journalières met en évidence une tendance à la diminution du cumul annuel moyen des pluies supérieures à 40 mm (qui sont considérées comme les grosses pluies à partir des années de rupture. Nous avons ensuite caractérisé la variabilité spatiale des précipitations annuelles moyennes sur 30 et 10 ans, puis les écarts par rapport à la décennie de référence 1961-1970. Il apparaît ainsi que le sud du bassin présente les excédents les plus forts durant les périodes excédentaires, mais aussi les déficits les plus élevés en périodes déficitaires.Runoff and consequently water resources constitute the response of watersheds to pluviometric impulses

  13. Evolution tectono-sédimentaire du bassin de Talara (nord-ouest du Pérou

    Directory of Open Access Journals (Sweden)

    1987-01-01

    Full Text Available Le bassin pétrolier de Talara, dans le nord-ouest du Pérou, est rempli par des séries terrigènes fluvio-deltaïques du Campanien à l'Eocène Supérieur. Cinq cycles de sédimentation (A, B, C, D, E sont définis par des séquences grano-décroissantes d'approfondissement du bassin, à l'exception du cycle B qui résulte de la progradation du système fluviatile. L'activité tectonique distensive qui domine l'évolution du bassin et contrôle la nature et la répartition des sédiments est interrompue, pendant l'Eocène Moyen, lorsque des chevauchements vers le sud-est se mettent en place dans la série tertiaire décollée du socle. Au front des chevauchements actifs, se forment des olistolithes ainsi que des brèches syntectoniques. L'analyse de la déformation en avant des failles inverses montre que les chevauchements se faisaient vers le sud-est et qu'ils affectaient des sédiments peu lithifïés. La cuenca sedimentaria y petrolera de Talara, en el noroeste del Perú, está rellena por secuencias fluvio-deltaicas del Campaniano al Eoceno Superior. Cinco ciclos de sedimentación (A,B,C,D,E están definidos por secuencias grano-decrecientes de hundimiento, excepto el ciclo B que representa una secuencia grano-creciente de progradación fluvial. La tectónica en distensión domina la evolución de la cuenca y también controla el tipo y la distribución de los sedimentos. Sin embargo, durante el Eoceno Medio, suceden cabalgamientos hacia el sureste, dentro de la cubierta sedimentaria terciaria despegada sobre el basamento paleozoico. Olistolitos y brechas tectónicas se forman en la parte frontal de los cabalgamientos donde el análisis de la deformación muestra que éstos se desarrollaron hacia el sureste y que afectaron sedimentos aún no litificados. Talara oil-basin in NW Peru is filled by fluvio-deltaic series of Campanian to Upper Eocene age. Five sedimentation Cycles (A,B,C,D,E are defined by fining-upward sequences resulting from

  14. Corps gras non conventionnels du Bassin du Congo : Caractérisation, biodiversité et qualité

    Directory of Open Access Journals (Sweden)

    Silou Thomas

    2014-03-01

    Full Text Available Cent trente échantillons d’huiles et graisses extraites de 77 espèces oléagineuses du Bassin du Congo, appartenant à 35 familles botaniques, font l’objet de cette revue. Les familles Annonaceae, Burseraceae, Cucurbitaceae, Irvingiaceae, Mimosaceae et Palmaceae sont les mieux représentées, avec au moins cinq espèces examinées pour chacune d’elles. La teneur en matière grasse varie de 13 à 87 % avec 30 % de plantes faiblement oléagineuses, 42 % de plantes moyennement oléagineuses et 33 % de plantes fortement oléagineuses. Les matières grasses extraites de ces plantes sont essentiellement constituées des acides gras (AG courants (C12 à C24 avec une prédominance nette des acides gras en C16 et C18. Un classement de ces matières grasses comme source de 1, 2 ou 3 acides gras majeurs a été proposé. Il distingue des huiles et graisses sources d’acides gras individuels (acides stéarique, oléique et linoléique, mais également des huiles et graisses sources des couples d’acides gras (laurique-mystique et stéarique-oléique. La situation la plus fréquente est celle du trio d’acides palmitique, oléique, linoléique, avec des teneurs individuelles en AG de l’ordre de 20 % et une teneur cumulée des trois AG au moins égale à 90 %. La représentation « radar-plots », en faisant ressortir les ressemblances et les différences entre les huiles et graisses étudiées, permet de faire un regroupement et éventuellement un classement de ces matières grasses par pôle d’intérêt. Un regroupement en fonction du profil des TAG majeurs a également été envisagé. Cette étude, qui regroupe une quantité importante de données obtenues sur une quarantaine d’années, met en évidence la grande diversité des espèces oléagineuses du Bassin du Congo et permet d’identifier, sur la base de leur composition chimique, les domaines potentiels d’utilisation des huiles et graisses examinées.

  15. Hydraulic Fracturing At Sedimentary Basin Scale Fracturation hydraulique à l'échelle des bassins sédimentaires

    Directory of Open Access Journals (Sweden)

    Schneider F.

    2006-12-01

    domain and then may initiate some fracturing. In other cases, the sediment changes its loading path but stay at the elastoplastic yield surface. In this case the theoretical considerations are not valid anymore and fracture criteria should be defined in the plastic domain. Fracturation hydraulique à l'échelle des bassins sédimentaires Fracturation hydraulique à l'échelle des bassins sédimentaires Le calcul du tenseur des contraintes est déterminant pour pouvoir simuler la fracturation hydraulique à l'échelle des bassins sédimentaires. Ce calcul n'est généralement pas abordé dans les modèles de bassins en raison de la complexité du problème. Pour pouvoir estimer le tenseur des contraintes, nous sommes alors amenés à formuler les hypothèses suivantes: - une des contraintes principales est verticale et égale, en module, au poids des terrains sus-jacents ; - la contrainte horizontale se déduit de la contrainte verticale à partir d'un coefficient de report K0 qui est une fonction de la profondeur et du contexte géodynamique. La consolidation est supposée être le résultat à la fois de la compaction mécanique et de la compaction chimique. La compaction mécanique est principalement due au réarrangement mécanique des grains pendant l'enfouissement. Elle peut se simuler, à l'échelle macroscopique, par une rhéologie élasto-plastique. La compaction chimique est le résultat des mécanismes de pression-dissolution. Elle peut être simulée, à l'échelle macroscopique, par une rhéologie viscoplastique. La surface de charge est complètement définie par l'union de la surface de consolidation avec les différentes limites de rupture. Cette surface de charge est alors définie par six surfaces élémentaires qui représentent la compaction verticale, la compaction horizontale, la rupture verticale en traction, la rupture horizontale en traction, la rupture subverticale en cisaillement, et la rupture subhorizontale en cisaillement. En raison du

  16. Estimation des quantités d'émissions azotées et des courbes de coût marginal d'épuration associées dans les secteurs et les régions du bassin d'un cours d'eau : une application pour le bassin rhénan

    OpenAIRE

    Saulnier, J.

    2008-01-01

    Dans cet article, nous nous intéressons aux questions liées à l'estimation des quantités d'émissions azotées et des courbes de coût marginal d'épuration dans le bassin d'un cours d'eau. L'application et les calculs empiriques sont réalisés pour les secteurs d'activité et les régions du bassin rhénan. Dans un premier temps, nous revenons sur les objectifs environnementaux formulés par la Commission Internationale pour la Protection du Rhin. L'intégration des contraintes de régulation existante...

  17. Quelques aspects de l'évolution géomorphologique quaternaire du haut bassin du Magdalena (Colombie

    Directory of Open Access Journals (Sweden)

    1974-01-01

    Full Text Available Le bassin supérieur du Rio Magdalena présente les caractéristiques suivantes: 1 L'allure générale du bassin montre une influence très nette de la tectonique. Il s'est développé grâce à la présence d'un ensemble de blocs affaissés relativement les uns par rapport aux autres et entourés de blocs soulevés qui forment les limites du bassin. Dans certains cas des édifices volcaniques se superposent à ces blocs (Nevado del Huila, parâmes de Las Papas, par exemple. 2 Dans certaines parties du bassin (Nevado del Huila, environs du rio Mazamoras, et de Pitalito, le volcanisme s'est développé durant tout le Quaternaire. De la sorte, en général on observe un paroxysme volcanique durant la période d'accumulation de QIII dont la position géomorphologique est très semblable à celle du Mindel européen (Nebraska d'Amérique du Nord. Les matériaux volcaniques ont ainsi contribué à la mise en place de l'accumulation QIII mais cette accumulation n'est pas un produit du volcanisme car on l'observe bien développée dans des vallées ou il n'y eut aucune activité volcanique à cette époque. Ainsi, la mise en place du remplissage QIII provient d'une oscillation climatique. La granulométrie très grossière du matériel QIII provient de la combinaison du volcanisme et de cette oscillation climatique. 3 Dans le bassin, les événements morphogénétiques les plus saillants sont les suivants: - une incision extrêmement profonde des talwegs des avant l'accumulation de QIII cette incision a atteint au moins le niveau des rivières actuelles - la fossilisation des cañons incisés durant cette phase par l'accumulation très épaisse du matériel QIII. - postérieurement, a fonctionné une tendance très générale à l'incision uniquement interrompue par les phases d'accumulation QI et QII. Actuellement, cette incision n'est toujours pas arrivée au niveau atteint avant l'accumulation de QIII. Durant cette période d'incision des rivi

  18. A chacun ses sciences participatives : Les conditions d’un observatoire participatif de la biodiversité sur le Bassin d’Arcachon

    OpenAIRE

    Salles, D.; Bouet, B.; Larsen, M.; Sautour, B.

    2014-01-01

    Cet article analyse les conditions préalables à la création d’un observatoire de sciences participatives de la biodiversité sur le Bassin d’Arcachon. L’enquête sociologique révèle les tensions entre finalités utilitaristes de recueil de données, nouveau mode collaboratif de construction des savoirs, instrument de communication politique, et démarche de vigilance citoyenne ; entre définition concertée de principes d’organisation des dispositifs et contrôle de positions de pouvoir sur le territ...

  19. Geology and Petroleum Systems of the Offshore Benin Basin (Benin Géologie et système pétrolier du bassin offshore du Benin (Benin

    Directory of Open Access Journals (Sweden)

    Kaki C.

    2012-12-01

    Full Text Available This paper summarizes the tectonosedimentary development and petroleum system of the Offshore Benin Basin (OBB. In accordance with structural development, the stratigraphic succession of this basin was divided into 4 sequences: pre-rift (up to Late Jurassic; rift (Neocomian to Lower Cretaceous; transitional (Cenomanian to Santonian and post-rift (Maastrichtian-Holocene sequences. Only one Upper Cretaceous petroleum system is well known within this basin. Source rocks of this system contain Type II-III kerogens with a TOC (Total Organic Carbon average of 2.9%. Oil is produced from sandstone facies within Abeokuta formation. Currently exploration data and geochemical characteristics of bituminous sands which outcrop in some onshore areas of the Dahomey Embayment point to the existence of another petroleum system of Lower Cretaceous age (Neocomian to Albian in this basin. Cet article résume l’évolution tectono-sédimentaire et le système pétrolier du Bassin Offshore du Bénin (BOB. Conformément à l’évolution structurale, la succession stratigraphique de ce bassin a été divisée en quatre séquences : anté-rift (allant jusqu’à la fin du Jurassique; rift (Néocomien-Crétacé inférieur; transitionnelle (Cénomanien-Santonien et post-rift (Maastrichtien-Holocène. Un seul système pétrolier d’âge Crétacé supérieur a été identifié avec certitude dans ce bassin. Les roches mères de ce système contiennent du kérogène de Type II-III, avec un COT (Carbone Organique Total moyen de 2,9 %. L’huile est produite à partir des faciès gréseux de la formation d’Abeokuta. Les données actuelles d’exploration et les caractéristiques géochimiques des sables bitumineux qui affleurent par endroits dans la partie continentale de la baie du Dahomey mettent en évidence l’existence d’un autre système pétrolier d’âge Crétacé inférieur (Néocomien à Albien dans ce bassin.

  20. Assessing human exposure to aluminium, chromium and vanadium through outdoor dust ingestion in the Bassin Minier de Provence, France.

    Science.gov (United States)

    Reis, A P; Patinha, C; Noack, Y; Robert, S; Dias, A C

    2014-04-01

    The Western part of the "Bassin Minier de Provence", a former coal mining area, is still occupied by old polluting industries such as a coal-fired power plant and an alumina factory. The identified pollution sources that raise more concern in the population are the emission of gases and dusts, as well as the storage of raw and transformed materials. In 2011, a preliminary survey was carried out in the area as the first step to an exposure and health risk-assessment study. This first survey intends to assess human exposure through ingestion and health risk associated with potentially harmful elements (PHEs) in ground-level dusts collected in recreational areas used by children. Dust samples were taken at 19 sites distributed across the study area, depending on the location of public parks, public gardens, playgrounds and schools. Pseudo-total concentrations of 53 elements were determined by ICP-MS. Bioaccessible concentrations were estimated using the unified bioaccessibility method. This study presents the results obtained for Al, V and Cr, which seem to be related with industry and show similar distribution patterns. PHEs presumably related to traffic or other urban pollution sources are not discussed in this study. The highest total concentrations occur in dusts near the alumina plant that have significant amounts of Al mineral phases (gibbsite and alumina). However, in these dusts only small fractions of the elements under study are in bioaccessible forms. The highest bioaccessible fractions occur in dusts collected near the coal-fired power plant. Further investigation is required to assess potential pathways of exposure and health risk in this area.

  1. Le « bassin des carènes » et le service technique des constructions navales à Balard : un exemple de cité scientifique à Paris

    Directory of Open Access Journals (Sweden)

    Valérie Gaudard

    2009-05-01

    Full Text Available Le « bassin des carènes » à Balard abrite un ensemble cohérent d’édifices techniques, scientifiques et administratifs destinés à l’étude du comportement des navires et de leur propulsion en toutes situations. Créé à l’initiative de l’ingénieur Bertin et inauguré en 1906, le premier bassin, en béton, comptait alors parmi les quatre plus grands bassins du monde. À partir de 1932, Perret frères édifient une véritable cité scientifique : bâtiment administratif (IMH 1965, laboratoires, plusieurs bassins sont élevés en béton armé, avec un même soin accordé à l’ensemble.The ‘bassin des carènes’, the ship testing tank situated at Balard, in Paris, comprises a coherent ensemble of technical , scientific and administrative buildings devoted to the study of ships and their propulsion in different situations. The facility was first created in 1906 at the instigation of the engineer Bertin. At this date, the towing tank, constructed in reinforced concrete, was one of the four largest in the world. From 1932, the Perret brothers were commissioned to provide other constructions, completing an authentic scientific complex or ‘city’. This included the administrative building (given historic monument protection in 1932 and several other tanks, all constructed in reinforced concrete and with the same attention to detail.

  2. Le remplissage synrift au permien et au trias du bassin de Tahanaout (Haut Atlas de Marrakech, Maroc géodynamique et organisation sédimentaire

    Directory of Open Access Journals (Sweden)

    Nassili, M.

    2004-12-01

    Full Text Available The perno-triasic basin of Tahanaout reflects a tectono-sedimentary organization typical of synrift basins. The genetic modes of its replenishment, reviewed in light of the sedimentary heterogeneity and the position of the sediments reveal an evolution in 3 episodes: individualization, differentiation and homogenization. The tectonics expresses itself every time, by a reorganization of the deposit areas, a dissymmetry of the syntectonic gutters and structures in the tilled blocks, within a NS extensional regime (episode 1 and NW-SE even (episode 11 and 111. The intermediate sequences follow each other in sequences of deposit that reflect and evolve in fluvio-deltaic environments, since the cone toward the alluvial or deltaic plain according to a topographic gradient. The sedimentary model suggests the existance basins in vertical relays in severa1 lateral progradation phases interrupted by phases of silt-clay sedimentary aggradations. The generalized semi-arid climate and the closed country environment plays an important role in the configuration of this type of basins, whose borders are essentially clastics, of an extended alluvial plain.Le bassin permo-triasique de Tahanaout reflète une évolution typique des bassins synrifts. Les modalités génétiques de son remplissage, révèlent une organisation en 3 épisodes tectonosédimentaires: l’individualisation, la différenciation et l’homogénéisation du bassin. La tectonique s’exprime par la création de gouttières syntectoniques et de structures en blocs basculés et s’inscrit dans un régime extensif N-S (épisode I puis NW-SE (épisodes II et III. La sédimentation continentale s’organise en plusieurs cycles de progradation – rétrogradation; dans laquelle, les séquences du milieu retracent toute la dynamique des environnements fluvio-deltaïques, depuis le cone vers la plaine alluviale ou deltaïque selon un gradient topographique décroissant. Le modèle s

  3. Metodología para la intervención en elementos históricos: el caso de la espadaña del convento de Nuestra Señora de la Consolación (Alcalá de Henares-Madrid-España

    Directory of Open Access Journals (Sweden)

    Martínez, E.

    2013-09-01

    Full Text Available The purpose of this paper is the study of damage detected in the belfry of the convent of “Nuestra Señora de la Consolación”, Alcalá de Henares, as well as the materials analysis to establish both the current state of the structure as the nature and extent of the deterioration of the original materials. For a good detection of defects in the structure were the application of a methodology of previous studies in historical buildings, in which were used, among other techniques, the element Thermographic Analysis, to then proceed to the experimental determination of the emissivities of the different inspected materials. The use of supplementary techniques of analysis as porosimetry of mercury, x-ray diffraction, electron microscopy of scanning and thermogravimetry, as well as mechanical characterization of materials, has made it possible to delve into the characteristics of the Union mortar and employed; evaluate comprehensively current degradation status and facilitating the rehabilitation.El objeto del presente trabajo es el estudio de daños detectados en la espadaña del Convento de Nuestra Señora de la Consolación, Alcalá de Henares, así como el análisis de los materiales para establecer, tanto el estado actual de la estructura, como la naturaleza y grado de deterioro de los materiales originales. Para ello se aplicó una metodología de estudios previos en edificaciones históricas, en la que se utilizaron, entre otras técnicas, el análisis termográfico del elemento, para posteriormente proceder a la determinación experimental de las emisividades de los diferentes materiales inspeccionados. El uso de técnicas complementarias de caracterización y análisis como porosimetría de intrusión de mercurio, difracción de rayos X, microscopía electrónica de barrido y termogravimetría, así como la caracterización mecánica de los materiales, ha permitido ahondar en las características del mortero de unión y las piezas de f

  4. De l’olivier à l’oléastre : origine et domestication de l’Olea europaea L. dans le Bassin méditerranéen

    OpenAIRE

    Breton, Catherine; Médail, Frédéric; Pinatel, Christian; Berville, Andre

    2006-01-01

    De l’olivier à l’oléastre : origine et domestication de l’Olea europaea L. dans le Bassin méditerranéen Keywords : VEGETAL PRODUCTIONS, NATURAL RESOURCES AND ENVIRONMENTRésumé : L’olivier occupe la 24 e place des 35 espèces les plus cultivées dans le monde. La diversité phénologique des cultivars est remarquable et l’intérêt économique de l’espèce est majeur. Pourtant peu d’études ont porté sur la domestication de l’olivier et sur les relations entre l’olivier et sa forme sauvage, l’oléastre....

  5. Retour sur la révolte du bassin minier. Les cinq leçons politiques d’un conflit social inédit

    OpenAIRE

    Chouikha, Larbi; Geisser, Vincent

    2012-01-01

    Lorsqu’elle a éclaté au début de l’année 2008, personne ne soupçonnait l’ampleur qu’allait prendre la révolte du bassin minier de Gafsa. Limitée au départ à des revendications socioprofessionnelles, elle a progressivement revêtu une dimension politique et protestataire qui fait d’elle un mouvement social emblématique de la crise du « système Ben Ali ». Sur le plan sécuritaire d’abord, où les modes d’encadrement autoritaires habituels se sont rapidement avérés incapables de contenir la contest...

  6. Bilan de la surveillance microbiologique du bassin de Marennes-Oléron et de la rive droite de la Gironde (Avril 1989 - Décembre 1992)

    OpenAIRE

    Faury, Nicole; Ratiskol, Jacqueline; Ratiskol, Gilles

    1993-01-01

    La surveillance bactériologique de 1989 à 1992 du bassin de Marennes-Oléron et de la rive droite de la Gironde met en évidence la bonne qualité du milieu. Les dépassements de la norme (>300 coliformes fécaux/100 g de chair et liquide intervalvaire) sont peu fréquents. Quelques pollutions sporadiques peuvent apparaître, le plus souvent en été, et sont liées au dysfonctionnement passager des systèmes d'assainissement (postes de relèvement, stations d'épuration) ou aux infiltrations d'eaux usées...

  7. Revision sistematique des Leptodirinae souterrains des Monts Apuseni. VI Les sous-genre Pholeuon (s.str. du Bassin du Someşul Cald (Monts du Bihor

    Directory of Open Access Journals (Sweden)

    Gheorghe Racoviţă

    2009-01-01

    Full Text Available Des mesures biométriques entreprises sur 746 mâles et 760 femelles de Pholeuon (s. str. angusticolle collectés de neuf grottes ont fourni les données brutes pour un traitement statistique réalisé par les mêmes méthodes multifactorielles que celles employées dans nos précédentes études régionales. Il est ainsi démontré qu’aux sous-espèces connues jusqu’à présent dans le bassin de Someşul Cald s’ajoutent trois autres, nouvelles pour la science: P. a. alunensis, P. a. longicornis et P. a. gujai.

  8. Hydrogéologie et pollution des eaux : exemple du bassin versant du Mazafran, Mitidja (Algérie)

    OpenAIRE

    Messaoud Nacer, Nasreddine

    1987-01-01

    Mazafran river basin forms a sublittoral plain of the western Mitidja. The Quaternary mantle is formed with gravels incillding Clay lenses. The impervious bedrock is made of blue plaisancien marls, of miocene marls or of certaceous miocene limestones. We can distinguish two aquifer reservoirs, the sandstone astien reservoir and the quaternary alluvial deposits reservoirs. The river basin receives a 740 mm height of water a year, that is to say an average volume of 1,4 millions of cube meter ,...

  9. Les caractéristiques du bassin des australopithèques (A. robustus, A. africanus et A. afarensis) sont-elles liées à une bipédie de type humain?

    OpenAIRE

    Berge, Christine; Ponge, Jean-François

    1983-01-01

    International audience; Deux bassins (STS 14, AL 288) et cinq os coxaux d'Australopithèques (SK 50, SK 3155. MLD 7), ainsi qu'un os coxal de Homo erectus (OH 28) ont été étudiés biométriquement à l'aide d'un programme d'analyse des correspondances, en comparaison avec la totalité des Simiens catarrhiniens (367 individus adultes appartenant à 19 genres). 16 mesures ont été prises sur le bassin, dont 11 sur l'os coxal seul. Les Australopithèques forment un groupe de Bipèdes avec le genre Homo (...

  10. Evaluation du logiciel CANOE sur un bassin versant nantais : Etude de sensibilité et capacité du modèle à reproduire des débits de période de retour

    OpenAIRE

    MOSINI, ML; RODRIGUEZ, F; ANDRIEU, H

    2003-01-01

    Le modèle pluie-débit CANOE est évalué sur un bassin versant nantais instrumenté par le LCPC depuis 1998 (bassin versant des Gohards). Deux objectifs sont visés. Une étude de sensibilité est tout d'abord menée. Celle-ci analyse l'influence des paramètres d'entrée du modèle sur les résultats de la modélisation, et permet au concepteur de définir ces valeurs. Cette étude montre l'importance des paramètres de la fonction de production comme, par exemple, le type de coefficient de ruissellement. ...

  11. Retraitement sismique d’anciens profils pétroliers pour imager les structures profondes de la Manche et de la bordure septentrionale du bassin de Paris : projet GEONORMER.

    OpenAIRE

    Toqeer, Muhammad; Capar, Laure; Paquet, Fabien; Thinon, Isabelle; Bitri, Adnand

    2016-01-01

    International audience; Dans le cadre de la reconnaissance géologique du sous-sol des domaines immergés français, le BRGM a retraité en 2012 d’anciennes données sismiques pétrolières des années 70 et 80 (Projet GEONORMER). Ces données recouvrent le domaine offshore de la Baie de Seine au bassin de Dieppe-Hampshire, bordure septentrionale du Bassin de Paris. Le Projet GEONORMER s’intègre dans un ensemble de différents projets scientifiques régionaux focalisés sur la géologie de la Manche et de...

  12. Pollution by psychoactive pharmaceuticals in the Rivers of Madrid metropolitan area (Spain).

    Science.gov (United States)

    González Alonso, Silvia; Catalá, Myriam; Maroto, Raúl Romo; Gil, José Luis Rodríguez; de Miguel, Angel Gil; Valcárcel, Yolanda

    2010-02-01

    There are a number of reports in the literature which describe the occurrence of so-called emerging pollutants, such as pharmaceuticals, in surface water. Few of these studies have reported values from large cities in relatively arid areas, such as in Spain. The persistence of some pharmaceuticals to usual wastewater treatments allows their discharge into surface waters. It is increasingly evident that mental health problems are of special concern for public health since psychiatric drugs are used in large amounts. Compared to other countries, Spain has a high pharmaceutical consumption rate, and Madrid metropolitan area is one of the most densely populated areas in Europe. The aim of the present study was to determine the presence of different psychoactive pharmaceuticals and metabolites in the main rivers of Madrid metropolitan area: Jarama, Manzanares, Guadarrama, Henares and Tajo. Sampling was done downstream of ten sewage treatment plants (STP) discharging into these rivers. Control points upstream of STPs discharge points were also sampled. Pharmaceutical compounds and metabolites for analysis were selected according to human consumption and prescription rates in Madrid, and the availability of valid techniques for detection. We observed residues of the antidepressants fluoxetine (80% of the sampling sites), citalopram (60%) and venlafaxine (100%), the anxiolytics nordiazepam (90%), oxazepam (80%) and 7-aminoflunitrazepam (10%) and the anticonvulsant carabamazepine (70%). Measured concentrations equalled or exceeded those reported for other geographical areas, although there is a pronounced lack of information for the anxiolytics and venlafaxine. This is of special concern given that Wyeth-Ayerst's venlafaxine, Effexor, was the 10th greatest selling pharmaceutical worldwide in 2006. We conclude that the origin of pharmaceutical pollution in the rivers of Madrid is mainly the discharge of sewage treatment plants in Madrid's metropolitan area and a

  13. The hydroelectric dam impacts on the Kompienga river basin (Burkina Faso); Les impacts du barrage hydro-electrique sur le bassin versant de la komoienga (Burkina Faso)

    Energy Technology Data Exchange (ETDEWEB)

    Dipama, J.M.

    1997-07-01

    This study takes stock on the physical and social environment negative impacts of the hydroelectric dam built in 1985 in the Burkina Faso. Th electric power of the country have been improved but the hydrocarbons consumption did not decrease. The vegetation decreased in the area of the dam from 15 km{sup 2} to 7,6 and soils are now more exposed to the erosion phenomena. Biological modifications of the ecosystem appeared as human diseases. (A.L.B.)

  14. Modèle de compaction élasto-plastique en simulation de bassins Elastoplastic Compaction Model for Basin Simulation

    Directory of Open Access Journals (Sweden)

    Schneider F.

    2006-11-01

    Full Text Available Cet article présente un modèle de compaction des sédiments pour simulateurs de bassins sédimentaires. Dans ce modèle, les concepts précédemment utilisés dans le modèle TEMISPACK sont généralisés et décrits en s'inspirant des formalismes propres à la mécanique des roches et à la mécanique des sols. La compaction des sédiments est décrite, à l'échelle des temps géologiques, par un modèle élasto-plastique où les modules d'incompressibilité et d'écrouissage croissent lorsque la déformation augmente et où le seuil de plasticité est variable. La rhéologie est définie par une relation qui lie la porosité (ou le volume du sédiment à la contrainte effective moyenne en se plaçant dans l'hypothèse de déformation oedométrique. Ce modèle à rhéologie volumiquea été testé sur le logiciel COMP1D qui simule, en 1D, l'histoire géologique d'une colonne sédimentaire. Ce modèle ne doit être considéré que comme un premier pas vers un formalisme plus complet. This article describes a sediment compaction model for sedimentary basin simulators. In this model, the concepts previously used in the TEMISPACK model are generalized and described on the basis of formalisms inherent in rock mechanics and soil mechanics. Sediment compaction is described on the geologic time scale by an elastoplastic model (Fig. 1 in which the moduli of incompressibility and strain hardening increase as deformation increases and in which the plasticity threshold varies. The rheology is defined by an equation connecting the porosity (or volume of the sediment to the mean effective stress by situating itself within the hypothesis of consolidometric deformation. This model is quite similar to the ones used in soil mechanics. It differs only by the choice of the equations linking the volumic variation of the porous medium to the variation of the mean effective stress likewise, in this part coefficient alpha introduced in the definition of effective

  15. Modelisation de l'erosion et des sources de pollution dans le bassin versant Iroquois/Blanchette dans un contexte de changements climatiques

    Science.gov (United States)

    Coulibaly, Issa

    Principale source d'approvisionnement en eau potable de la municipalite d'Edmundston, le bassin versant Iroquois/Blanchette est un enjeu capital pour cette derniere, d'ou les efforts constants deployes pour assurer la preservation de la qualite de son eau. A cet effet, plusieurs etudes y ont ete menees. Les plus recentes ont identifie des menaces de pollution de diverses origines dont celles associees aux changements climatiques (e.g. Maaref 2012). Au regard des impacts des modifications climatiques annonces a l'echelle du Nouveau-Brunswick, le bassin versant Iroquois/Blanchette pourrait etre fortement affecte, et cela de diverses facons. Plusieurs scenarios d'impacts sont envisageables, notamment les risques d'inondation, d'erosion et de pollution a travers une augmentation des precipitations et du ruissellement. Face a toutes ces menaces eventuelles, l'objectif de cette etude est d'evaluer les impacts potentiels des changements climatiques sur les risques d'erosion et de pollution a l'echelle du bassin versant Iroquois/Blanchette. Pour ce faire, la version canadienne de l'equation universelle revisee des pertes en sol RUSLE-CAN et le modele hydrologique SWAT ( Soil and Water Assessment Tool) ont ete utilises pour modeliser les risques d'erosion et de pollution au niveau dans la zone d'etude. Les donnees utilisees pour realiser ce travail proviennent de sources diverses et variees (teledetections, pedologiques, topographiques, meteorologiques, etc.). Les simulations ont ete realisees en deux etapes distinctes, d'abord dans les conditions actuelles ou l'annee 2013 a ete choisie comme annee de reference, ensuite en 2025 et 2050. Les resultats obtenus montrent une tendance a la hausse de la production de sediments dans les prochaines annees. La production maximale annuelle augmente de 8,34 % et 8,08 % respectivement en 2025 et 2050 selon notre scenario le plus optimiste, et de 29,99 % en 2025 et 29,72 % en 2050 selon le scenario le plus pessimiste par rapport a celle

  16. Gestion des ressources hydriques adaptee aux changements climatiques pour la production optimale d'hydroelectricite. Etude de cas: Bassin versant de la riviere Manicouagan

    Science.gov (United States)

    Haguma, Didier

    Il est dorenavant etabli que les changements climatiques auront des repercussions sur les ressources en eau. La situation est preoccupante pour le secteur de production d'energie hydroelectrique, car l'eau constitue le moteur pour generer cette forme d'energie. Il sera important d'adapter les regles de gestion et/ou les installations des systemes hydriques, afin de minimiser les impacts negatifs et/ou pour capitaliser sur les retombees positives que les changements climatiques pourront apporter. Les travaux de la presente recherche s'interessent au developpement d'une methode de gestion des systemes hydriques qui tient compte des projections climatiques pour mieux anticiper les impacts de l'evolution du climat sur la production d'hydroelectricite et d'etablir des strategies d'adaptation aux changements climatiques. Le domaine d'etude est le bassin versant de la riviere Manicouagan situe dans la partie centrale du Quebec. Une nouvelle approche d'optimisation des ressources hydriques dans le contexte des changements climatiques est proposee. L'approche traite le probleme de la saisonnalite et de la non-stationnarite du climat d'une maniere explicite pour representer l'incertitude rattachee a un ensemble des projections climatiques. Cette approche permet d'integrer les projections climatiques dans le probleme d'optimisation des ressources en eau pour une gestion a long terme des systemes hydriques et de developper des strategies d'adaptation de ces systemes aux changements climatiques. Les resultats montrent que les impacts des changements climatiques sur le regime hydrologique du bassin de la riviere Manicouagan seraient le devancement et l'attenuation de la crue printaniere et l'augmentation du volume annuel d'apports. L'adaptation des regles de gestion du systeme hydrique engendrerait une hausse de la production hydroelectrique. Neanmoins, une perte de la performance des installations existantes du systeme hydrique serait observee a cause de l'augmentation des

  17. Developing Rivers

    Directory of Open Access Journals (Sweden)

    Abhik Chakraborty

    2013-10-01

    Full Text Available This article explores the reasons behind the continuation of contentious dam projects in Japanese river basins. Though the River Law of the country was reformed in 1997, and subsequent sociopolitical developments raised hopes that river governance would progress toward a more environment-oriented and bottom-up model, basin governance in Japan remains primarily based on a utilitarian vision that sees rivers as waterways. This article reviews the Achilles heel of the 1997 River Law by examining some most contentious river valley projects, and concludes that a myth of vulnerability to flooding, short-sightedness of river engineers, and bureaucratic inertia combine to place basin governance in a time warp: as projects planned during postwar reconstruction and economic growth continue to be top priorities in policymaking circles while concerns over environment remain largely unaddressed.

  18. Les Territoires de l’eau et la décentralisation. La gouvernance de bassin versant ou les limites d’une évidence

    Directory of Open Access Journals (Sweden)

    Stéphane Ghiotti

    2006-02-01

    Full Text Available La mise en place progressive en France d’une politique territoriale de l’eau, propulse la gestion de la ressource au cœur des enjeux liés à l’aménagement et au développement du territoire. Le vaste mouvement de recomposition organisationnelle et politique en cours favorise cette approche fonctionnaliste par bassin. Cependant, il contribue également à asseoir la légitimité d’autres constructions territoriales – dont les logiques relèvent davantage de l'opportunisme stratégique des collectivités territoriales que de la dimension géographique et environnementale de l'eau. A côté DU territoire de l’eau (ré ? émergent ou se constituent DES territoires de l’eau.The progressive implementation of territorial water policy in France, raises the stakes for water management in land planning and territorial development. The current vast movements in organisational and political reshuffling, support an operational approach by basin. However, it also contributes to establish the legitimacy of other territorial constructions - whose logic derives more from the strategic opportunism of local authorities than from the geographical and environmental dimensions of water. By side of “a” water territory, sits in fact, “many” water territories.

  19. Églises et temples en bassins industriels : Belfort-Héricourt-Montbéliard (Franche-Comté (1944-2008

    Directory of Open Access Journals (Sweden)

    Yves-Claude Lequin

    2009-11-01

    Full Text Available Si l’on en juge par l’exemple de Belfort-Montbéliard, nombreux furent les lieux de culte - catholiques et luthériens - construits dans les bassins industriels français entre 1950 et 1968. Étapes : églises modernes « en majesté » vers 1950, églises sobres aux formes arrondies dans les ZUP vers 1960, préfabriqués après 1964, quasi arrêt en 1968, reconversion du bâti à partir de 1990. Raisons de cet essor puissant et du rapide déclin : les tensions sociales et les évolutions mentales des paroissiens.From the example of Belfort-Montbéliard, a fair number of places of worship - Catholic and Lutheran - were built in French industrial basins between 1950 and 1968. Stages: modern “in majesty” churches around 1950, sober buildings with curved shapes in priority development areas around 1960, prefabricated buildings after 1964, hardly any construction in 1968, conversion of buildings as from 1990. Reasons for this marked growth and for the swift decline: social tensions and evolution of parishioners ‘minds.

  20. River nomads

    DEFF Research Database (Denmark)

    2016-01-01

    River nomads is a movie about people on the move. The documentary film explores the lifestyle of a group of nomadic fishermen whose mobility has been the recipe of success and troubles. Engaged in trade and travel, twice a year the river nomads form impressive convoys of majestic pirogues and set...... and liberated lifestyle and the breath-taking landscapes and vistas offered by the Niger River. River Nomads is also a personal account of the Kebbawa’s way of life and their current struggles as nomadic folk living in a world divided by borders and ruled by bureaucrats....

  1. River Piracy

    Indian Academy of Sciences (India)

    . Asiatic Soc. o/Bengal., 55:322-343.1886. C F Oldham. The Saraswati and the lost river of the Indian desertJ. R. Asiatic. Soc., 34:49-76. 1893. S C Sharma. The description of rivers in the Rigveda, The Geographical. Observer, 10:79-85. 1974.

  2. L’évolution des pratiques agricoles face aux enjeux de la qualité de l’eau : le bassin de l’Oudon (France)

    OpenAIRE

    Laurent, François

    2015-01-01

    L’alimentation en eau et la protection des milieux aquatiques sont confrontées aux pollutions diffuses d’origine agricole dans le nord-ouest de la France. Les politiques de gestion des ressources en eau s’appuient à présent sur la participation des agriculteurs afin de concevoir des solutions adaptées aux territoires. En effet, si la réglementation est nécessaire, elle n’est pas suffisante pour atteindre une qualité satisfaisante sur de nombreux bassins versants fortement pollués par les nitr...

  3. Carte géologique et Structurale des bassins tertiaires du domaine méditerranéen : commentaires Geological and Structural Map of Tertiary Basins in the Mediterranean Domain : Comments

    Directory of Open Access Journals (Sweden)

    Biju-Duval B.

    2006-11-01

    Full Text Available Cette note est destinée à commenter la représentation adoptée sur la « Carte géologique et structurale des bassins tertiaires du domaine méditerranéen » publiée par l'IFP, le CNEXO et l'INAG. On y précise les principes de réalisation, le but principal étant de situer les informations marines disponibles dans leur cadre géologique s les données en mer sont principalement relatives aux séries quaternaires et tertiaires récentes : seules celles-ci ont été détaillées sur la carte et inscrites dans le cadre structural des bassins. Dans une première partie, des commentaires techniques précisent les différentes représentations utilisées à terre et en mer, situent les simplifications effectuées et donnent un aperçu sur la bibliographie et l'évolution des connaissances. La seconde partie permet de survoler rapidement les problèmes des bassins tertiaires méditerranéens par quelques commentaires géologiques qui donnent une esquisse de l'histoire de ces bassins. En conclusion, on essaie de faire ressortir les points importants qui se dégagent après lecture attentive de la carte. The aim of this article is ta comment on the representation adopted for the « Geological and Structural Map of Tertiary Basins in the Mediterranean Domain » published by IFP, CNEXO and INAG. The main goals are shaded, with the principal one being to situate available marine data in their geological setting. Offshore data mainly have ta do with recent Quartenary and Tertiary series which are the only cries itemized on the map and included within the structural setting of the basins. The first part contains technical comments on the different representations used, both onshore and offshore, to situate the simplifications used and to give some insight into the bibliography and how our understanding has evolved. The second part makes a brief review of problems relating to Mediterranean Tertiary basins with the help of various geological comments

  4. La mécanique des fluides numérique appliquée à l'optimisation du transfert d'oxygène dans les bassins d'aération

    OpenAIRE

    FAYOLLE, Yannick ; COCKX, Arnaud ; HÉDUIT, Alain ; GILLOT, Sylvie

    2012-01-01

    L’optimisation des dispositifs d’aération équipant les bassins aérobies des stations d’épuration est essentielle pour garantir la qualité du traitement des eaux résiduaires, mais aussi pour limiter les coûts de construction et énergétiques des installations. À l’aide de la mécanique des fluides numérique, Irstea développe des modèles pour améliorer la conception et le fonctionnement de ces dispositifs.

  5. Implementation of Theeuropeanwater Framework Directive In France: New Challenges For River Basin Organisat Ion, Planning and Participation

    Science.gov (United States)

    Allain, S.

    The European Water Framework Directive (2000/60/EC) establishes a system of participatory river basin planning for national and international basins. The French institutional framework for water management is already very close to this system: the 1964 Water Law actually set up basin bodies, the Agences de l'Eau ("Water Agencies"), at the level of large river basins, and multipartite basin commissions, the Comités de Bassin ("River Basin Authorities"), in order to monitor the Agences de l'Eau's policies; besides, the 1992 Water Law created a planning procedure at this level, the Schéma Directeur d'Aménagement et de Gestion des Eaux (SDAGE : "General Water Management Plan"), aiming to determine general orientations for the management of water resources and having to be defined by the Comités de Bassin. At first glance therefore, the implementation of the European Water Framework Directive should not raise a lot of problems in France. However, a quick analysis of the current situation shows that it is not so obvious : if the French Water Policy set up two basin organisations, neither of them deals concretely with the management of the water resources, and the implementation of water management plans depends on many stakeholders; the SDAGE itself only partially meets the demands of the Directive, regarding e. g. the economic analysis; finally, in spite of the creation of multipartite basin commissions, the public participation is very restricted. Such an analysis leads to pay more attention to the relations to establish between organisation, planning and participation at the level of large river basins. An analysis of other elements of the French institutional framework can help us in this way : another planning procedure was actually created by the 1992 Water Law, the Schéma d'Aménagement et de Gestion des Eaux (SAGE : "Water Management Plan"), aiming to fix general objectives to manage the water resources at the level of small river basins, and having to be

  6. Evaluation des taux de recapture et de retour de la truite de mer sur le bassin de la Bresle (Haute-Normandie/Picardie

    Directory of Open Access Journals (Sweden)

    FOURNEL F.

    1990-07-01

    Full Text Available Plusieurs campagnes de marquage ont été réalisées de 1982 à 1988 sur le bassin de la BRESLE visant à définir, en conditions naturelles, les taux de recapture et de retour de la truite de mer, dans le cadre de l'étude fonctionnelle des populations en cours sur ce bassin. Les poissons sont marqués : • soit au stade smolt : cinq campagnes de marquage réalisées de 1982 à 1986, 17.410 poissons marqués au total • soit au stade adulte bécard : trois campagnes réalisées, 481 truites de mer marquées. Deux types de marquage sont utilisés : • marquage de groupe par tatouage à l'azote liquide, accompagné d'une ablation de la nageoire adipeuse, pour la plus grande partie des smolts • marquage individuel par étiquette Carlin avec attache par fil polyéthylène. pour les smolts restants et pour tous les bécards. Une attention particulière est portée à la récupération des poissons marqués (piègeage et captures par pêche, en milieu fluvial et maritime côtier. Les retours de marques sont issus d'une vaste zone géographique mais proviennent pour l'essentiel de la Bresle et de la zone maritime environnante (dispositif de piègeage et filets fixes côtiers. Pour les smolts, les taux de recapture (chiffres bruts sont corn pris entre 4,4 et 12,3 %, les taux de retour entre 5,5 et 20 %. Les valeurs observées sont toujours plus élevées pour les poissons cryomarqués que pour ceux marqués Carlin (taux de retour à la zone de départ de 15 % en moyenne pour les premiers, de 9,2 % pour les seconds. Les taux de recapture et de retour "truite de mer" sont toujours supérieurs, d'un facteur 1,7 à 2,2 selon le taux considéré, aux taux "saumon" obtenus dans les mêmes conditions. Les taux observés chez les bécards (taux de retour à la zone de départ compris entre 31 et 50 % témoignent de l'excellente survie post-frai des géniteurs de truite de mer. Les travaux réalisés ont permis d'obtenir les premiers chiffres fran

  7. Analyse territoriale du régime institutionnel des ressources en eau : le cas du bassin versant de l’Audomarois

    Directory of Open Access Journals (Sweden)

    Iratxe Calvo-Mendieta

    2006-02-01

    Full Text Available Les approches économiques traditionnelles développées pour analyser la gestion des ressources naturelles demeurent a-historiques et non-situées, ignorant ainsi l’influence de la variable « territoire ». Dans cet article, nous présentons un cadre analytique, le régime institutionnel de ressource, qui tente de dépasser les limites des approches traditionnelles en combinant, d’une part, le système des droits de propriété et d’usage d’une ressource et, d’autre part, les politiques publiques de protection et/ou d’usage de celle-ci. L’analyse du régime institutionnel de l’eau dans le bassin versant de l’Audomarois nous permet de mieux comprendre et d’identifier les leviers du changement et les mécanismes par lesquels l’évolution vers un régime intégré de l’eau est possible.Traditional economic approaches developed to analyze natural resources management remain unhistorical and non-situated and thereby ignore the influence of the territorial specificities. In this article, we present an analytical framework, the institutional resource regime, which tries to overstep the limits of traditional approaches by combining the property and use rights system with the resource-specific protection and/or use policy. The analysis of the institutional water resource regime in the Audomarois water basin allows us a better identification and gives us an improved understanding of change levers as well as of mechanisms leading to an integrated water regime.

  8. Gestion des externalités environnementales dans le bassin minier du Nord – Pas de Calais : une approche en termes de proximité

    Directory of Open Access Journals (Sweden)

    Gwénaël Letombe

    2006-05-01

    Full Text Available Cet article a pour objet l’application des catégories conceptuelles de la proximité à la problématique de gestion des externalités environnementales. Le cas d’étude est celui d’une zone d’ancienne industrialisation en reconversion – le bassin minier du Nord – Pas de Calais – soumise à un passif environnemental spécifique. Nous tentons de montrer que l’incertitude inhérente aux externalités induit, en premier lieu, une certaine faiblesse des proximités organisées, puis la construction de formes de proximités particulières, passant par des dispositifs régulatoires innovants. Le contenu de ces proximités, leur efficacité, leur lien avec la dynamique économique territoriale, sont analysés successivement.Managing the environmental externalities of the Nord – Pas de Calais coal field : a tentative approach in terms of proximity. The purpose of this article is to explore how the conceptual categories used in the proximity approach can be applied to such issues as the management of environmental externalities. The case study is the Nord – Pas de Calais coal field, a formerly industrial area. Consequently, we focus on the specific environmental damages in this area which is currently undergoing reconversion. The aim of this paper is to show that the uncertainty which is inherent to externalities induces some degree of weakness on the part of “organised proximities” at first, then the setting-up of specific forms of proximity via innovative regulatory tools. The contents of those proximities, their efficiency and their relevance to the local economic dynamics will be analysed successively.

  9. Analyse séquentielle de l'Eocène et de l'Oligocène du bassin Parisien (France Sequence Analysis of the Eocene-Oligocene Paris Basin, France

    Directory of Open Access Journals (Sweden)

    Gely J. P.

    2006-11-01

    Full Text Available Dans le Bassin parisien pendant l'Eocène et l'Oligocène, on dénombre vingt-deux discontinuités issues d'émersions correspondant aux périodes de bas-niveaux marins. La présence de fleuves est décelée dans les prismes de bordure de plate-forme et dans les prismes de haut niveau, remobilisant des stocks sableux anciens à partir des anticlinaux actifs et des bordures du bassin. Ainsi, indépendamment du volume disponible pour les sédiments, se succèdent des séquences dominées soit par des formations détritiques, soit par des formations carbonatées. La plate-forme parisienne a enregistré toutes les variations eustatiques connues, bien que les mouvements tectoniques syn-sédimentaires locaux puissent influencer fortement les conditions de sédimentation. Mieux encore, la plate-forme parisienne a subi des fluctuations marines d'ordre supérieur de très courte durée qui, si elles sont retrouvées dans d'autres domaines, pourront être attribuées à des phénomènes eustatiques. The Paris Basin (Map 1 is a classic example of a stable platform such as has been known throughout the World for a long time now. Aside from the Bartonian and Priabonian, all Eocene and Oligocene stages have been defined in the form of the following four international stratotypes : Sparnacian, Cuisian, Lutetian and Stampian. It should also be noted that the substages of the Bartonian (Auversian, marinesian and the Ludian, the equivalent of the Priabonian, are also Parisian. Even though gaps have recently been redefined (C. Pomerol, 1989, though the correlations between the different formations in the basin and those of the surrounding areas (D. Curry, 1967; et al. 1969, 1978; C. Pomerol, 1977; C. Cavelier, 1979; C. Cavelier and C. Pomerol, 1986 have now been determined, and though the worldwide eustatic sea level curve was partly plotted with the help of stratotype sections (B. U. Haq et al. , 1988, the Eocene and Oligocene sequence analysis of the paris Basin

  10. Contested Rivers

    DEFF Research Database (Denmark)

    Gorm Hansen, Louise Lyngfeldt

    explores translocal connections through ethnographic fieldwork at a global water conference and preliminary fieldwork at chosen locations on China's Nu River. The Nu River is one of the last undammed rivers in Asia and runs through China close to the Chinese-Burmese border, then flows into the Andaman Sea...... policy making, decision drivers and framing of large hydropower projects in China. Hydropower is a complex and interesting field to explore as the consequences go beyond the immediate locality and interacts with local as well as the global contexts. Inspired by Tsing (2003) and Zhan (2008) the paper...... and natural scientists and Chinese hydropower companies (to name a few). The paper maps different actors’ framing of the issue to gain a deeper understanding of the complexities of hydropower policymaking in China, as well as map the local consequences of global policymaking about large hydropower...

  11. Analyse des statistiques de pêche aux engins dans le bassin du Rhône. Deuxième partie : étude des captures

    Directory of Open Access Journals (Sweden)

    CHANGEUX T.

    1993-07-01

    Full Text Available En confrontant les captures déclarées et les autorisations délivrées sur le Rhône et la Saône en 1988 et 1989, on estime pour ces deux années les prélèvements de la pêche aux engins à 238 t/an et 273 t/an. Les captures sont essentiellement constituées de grands cyprinidés (Abramis brama, Blicca bjoerkna, Rutilus rutilus et Chondrostoma nasus et de poissons amphihalins comme les muges (Liza ramada en majorité ou l'anguille (Anguilla anguilla. La pêche professionnelle fluviale représente en moyenne 72 % des captures. Pour certaines espèces comme les aloses (Alosa fallax en majorité, le brochet (Esox lucius, le sandre (Stizostedion lucioperca et le poisson-chat (ictalurus mêlas, les pêcheurs amateurs aux engins et filets prélèvent des quantités comparables à celles des professionnels. De plus, les amateurs sont majoritaires dans les productions de la Saône amont. La biomasse totale des captures du Rhône deltaïque arrive en seconde position derrière celle de la Saône aval, située au centre du bassin. Ce secteur apparaît comme une zone de première importance pour la pratique de la pêche aux engins strictement fluviale en France. Les captures déclarées suivent un rythme saisonnier en relation avec le cycle de l'effort de pêche mis en évidence dans la première partie de l'article (CHANGEUX et ZYLBERBLAT, ce numéro. Les aloses sont capturées pendant la fermeture des autres pêches, au mois de mai. Les muges sont capturés pendant la saison "froide" et la friture de petits cyprinidés (Alburnus alburnus, en majorité pendant la "saison chaude". Dans la Saône aval, l'analyse des Captures par Unité d'Effort (CPUE valide la distinction des métiers définis dans la première partie de l'article. L'utilisation des CPUE est envisagée pour suivre les stocks des principales captures du secteur.

  12. Cartographie de l’érosion hydrique en zone montagneuse : cas du bassin versant des Aït Bou Goumez, Haut Atlas, Maroc

    Directory of Open Access Journals (Sweden)

    Abaoui, J.

    2005-04-01

    Full Text Available Ce travail présente la cartographie de l’érosion hydrique en zones montagneuses (Haute Atlas, Maroc en se basant sur trois facteurs principaux : la friabilité du substratum rocheux, le degré de pente et la densité du couvert végétal. La carte du potentiel érosif est obtenue par la somme d’indices attribués aux couches thématiques (la friabilité du substratum rocheux, le degré de la pente et la densité du couvert végétal multipliés par le pourcentage de contribution de chaque facteur. Dans un environnement de SIG, les pourcentages de contribution ont été obtenus par itération en se référant à la réalité de terrain. Les pourcentages 50%, 30% et 20% retenus correspondent respectivement à la friabilité du substratum, le degré de la pente et la densité du couvert végétal. Ce travail peut être utilisé pour cartographier le potentiel érosif dans d’autres bassins versant du Haut Atlas central qui présentent des faciès géologiques, une topographie et un couvert végétal similaires à la zone des Aït Bou Goumez.El objetivo de este trabajo es la realizacion de la cartografía de erosión hídrica en zonas montañosas (Alto Atlas, Marruecos, basándose sobre tres principales factores: la friabilidad del sustrato litológico, el buzamiento y la densidad de la coberteza vegetal. El mapa del potencial erosivo se obtiene por la suma de índices relativos a las capas temáticas (la friabilidad del sustrato litológico, el buzamiento y la densidad de la coberteza vegeta multiplicado por los porcentajes de contribución de cada factor. Estos porcentajes se han obtenido por iteración refériéndose a la realidad del terreno. Los porcentajes 50%, 30% y 20% retenidos corresponden respectivamente a la friabilidad del sustrato litológico, el buzamiento y la densidad de la coberteza vegetal. Este trabajo puede ser utilizado para cartografiar el potencial erosivo en otras cuencas de drenaje del Alto Atlas central que

  13. River Piracy

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 1; Issue 5. River Piracy Saraswati that Disappeared. K S Valdiya. General Article Volume 1 Issue 5 May 1996 pp 19-28. Fulltext. Click here to view fulltext PDF. Permanent link: http://www.ias.ac.in/article/fulltext/reso/001/05/0019-0028. Author Affiliations.

  14. Applying electrical resistivity tomography and biological methods to assess the surface-groundwater interaction in two Mediterranean rivers (central Spain)

    Science.gov (United States)

    Iepure, Sanda; Gómez Ortiz, David; Lillo Ramos, Javier; Rasines Ladero, Ruben; Persoiu, Aurel

    2014-05-01

    Delineation of the extent of hyporheic zone (HZ) in river ecosystems is problematic due to the scarcity of spatial information about the structure of riverbed sediments and the magnitude and extent of stream interactions with the parafluvial and riparian zones. The several existing methods vary in both quality and quantity of information and imply the use of hydrogeological and biological methods. In the last decades, various non-invasive geophysical techniques were developed to characterise the streambed architecture and also to provide detailed spatial information on its vertical and horizontal continuity. All classes of techniques have their strengths and limitations; therefore, in order to assess their potential in delineating the lateral and vertical spatial extents of alluvial sediments, we have combined the near-surface images obtained by electrical resistivity tomography (ERT) with biological assessment of invertebrates in two Mediterranean lowland rivers from central Spain. We performed in situ imaging of the thickness and continuity of alluvial sediments under the riverbed and parafluvial zone during base-flow conditions (summer 2013 and winter 2014) at two different sites with distinct lithology along the Tajuña and Henares Rivers. ERT was performed by installing the electrodes (1 m spacing) on a 47 m long transect normal to the river channel using a Wener-Schlumberger array, across both the riparian zones and the river bed. Invertebrates were collected in the streambed from a depth of 20-40 cm, using the Bou-Rouch method, and from boreholes drilled to a depth of 1.5 m in the riparian zone. The ERT images obtained at site 1 (medium and coarse sand dominated lithology) shows resistivity values ranging from ~20 to 80 ohm•m for the in-stream sediments, indicating a permeable zone up to ~ 0.5 m thick and extending laterally for ca. 5 m from the channel. These sediments contribute to active surface/hyporheic water exchanges and to low water retention in

  15. Variabilité des processus hydrologiques entrant dans le mécanisme de la genèse des crues sur les bassins à cinétique rapide

    OpenAIRE

    Le, Xuan Kham

    2008-01-01

    Le logiciel MARINE développé à l’Institut de Mécanique des Fluides de Toulouse, est un modèle pluie – débit distribué, événementiel, temps réel, à base physique dédié aux crues à cinétique rapide. Il fournit des informations distribuées et des hydrogrammes de crue qui permettent aux prévisionnistes d’estimer en temps réel la dangerosité d’une crue. Chaque paramètre du modèle est issu de cartographies de données. Il est ajusté par un coefficient multiplicatif unique pour l’ensemble du bassin t...

  16. Modèle d'étude et de gestion de la teneur en azote des eaux de surface dans un bassin-versant sous culture

    Science.gov (United States)

    Caussade, B.; Pierre, D.; Prat, M.

    1984-07-01

    A numerical model is proposed which simulates nitrogen transformations and transport for river basins with various fertilized crops, acting as non-point sources. It simulates nitrogen transformations and the transport towards the river outlet. The validation of the model was based on experimental data from a small basin in southwest France. The model is used to show the influence of various phenomena on water quality such as: leaching, temperature, fertilizer use and crop type.

  17. Sedimentary Basins of the Republic of Yemen : Their Structural Evolution and Geological Characteristics Evolution structurelle et caractéristiques géologiques des bassins sédimentaires de la république du Yemen

    Directory of Open Access Journals (Sweden)

    Beydoun Z. R.

    2006-11-01

    rejuvenation of the ancient NW-SE Najd fault system with subordinate strike-slip motion. The Tertiary basins are related to separation of Arabia from Africa in the Neogene along the Gulf of Aden and Red Sea trends. The principal uplifts are of equal antiquity, the oldest and most persistent being the Hadhramawt Arch. All the tectonic activity is linked to Gondwanan fragmentation and breakup from the initial closure of the paleo-Tethys and opening of the neo-Tethys in late Carboniferous to Permian times, and the development of the African Karoo system, through separation of India from Afro-Arabia in the Cretaceous to ultimate separation of Arabia from Africa in the Neogene. Within individual basins, compartmentalisation by sub-parrallel highs into graben-like and half-graben sub-basins or sectors is related to local adjustments to this continuing motion within the overall structural framework. Il y a peu de temps encore, on ne disposait que de peu d'informations sur la distribution et l'évolution des bassins sédimentaires au Yemen, puisque les données existantes reposaient entièrement sur la géologie de surface et les corrélations des formations stratigraphiques anciennes étudiées uniquement dans les redressements situés en bordure du golfe d'Aden et de la mer Rouge, ou sur le haut plateau au nord-ouest où l'on a réalisé des coupes en profondeur. Partout ailleurs, la couche tabulaire de sédiments du Tertiaire et de laves du groupe volcanique du Tertiaire masquait les principaux éléments structurels précénozoïques sous-jacents ainsi que les diverses successions sédimentaires. Les premières tentatives de délinéation de la structure des sols du pays furent donc rudimentaires et/ou ne pouvaient être que partiellement correctes. La découverte de champs de pétrole et de gaz rentables dans plusieurs fossés d'effondrement mesozoïques, à l'intérieur du Yemen, à la fin des années quatre-vingt et au début des années quatre-vingt-dix après l

  18. Antecedent Rivers

    Indian Academy of Sciences (India)

    far north of the high NandaDevi (7,817 m) - Api Nampa. (7,132 m) range of the Himadri. The Sindhu flows northwestwards, the Satluj goes west, the Karnali takes the southerly course and the Tsangpo flows east. These rivers flow through their pristine channels, carved out at the very outset about 50 to 55 m.y (million years) ...

  19. Les affaissements miniers dans le bassin ferrifère lorrain : quand le territoire re-politise la gestion du risque

    Directory of Open Access Journals (Sweden)

    François Duchêne

    2008-10-01

    Full Text Available Avec la fin de l’extraction et la vente des cités minières, les affaissements miniers, de risques liés au travail se sont transformés en risques environnementaux. Les dégâts miniers étaient traités jusque-là en interne par les exploitants, et ils sont donc devenus une affaire des services de l’Etat lors de la remise des concessions minières. Ce transfert a été particulièrement vif dans le bassin ferrifère lorrain, aux couches peu profondes et donc plus propice que d’autres aux phénomènes d’affaissement. Les réactions locales à ces effondrements ont été d’autant plus virulentes qu’elles touchaient un territoire en crise. Les services de l’Etat ont avant tout cherché à apporter des réponses techniques et sectorielles pour prévenir les risques. Or les affaissements ont fait bouger bien plus que les maisons. Ils ont mis en mouvement des acteurs locaux issus d’une histoire politique, économique et sociale née des mines et de la sidérurgie et meurtries par la désindustrialisation. Au final, c’est précisément parce qu’il y avait un contexte territorial spécifique, avec la mobilisation de forces sociales encore chargées d’une histoire toute proche, qu’une dimension politique s’est imposée dans la gestion et le traitement de ces risques.With the end of mining activity and the sale of miners’ dwellings, the question of subsidence, hitherto an industrial hazard, became an environmental risk. The damage caused by mining, an issue previously addressed privately by the owners, became the responsibility of government services when mining concessions were handed over to the State. The handover was particularly delicate in the iron-ore basin of Lorraine, where the closeness of the ore to the surface made this area more liable to subsidence than others. Local reactions to the phenomenon were all the more heated as the territory was already in the throes of an economic crisis. The solutions sought by

  20. L' évaluation du risque géomorphologique dans le bassin hidrographique Suha Mică (droit affluent de la riviere Moldova

    Directory of Open Access Journals (Sweden)

    Francisca Anca CHIRILOAEI

    2010-02-01

    Full Text Available La cartographie des aires qui présentent un risque géomorphologique est devenue une nécessité sociale. Dans le domaine de la recherche des processus concernant le versant et le canal (le lit de la rivière des éléments indicateurs ont été signalés, et qui peuvent conduire à faire l’inventaire des facteurs de risque locaux. Parmi les nombreuses ossibilités de combinaison des facteurs géomorphologiques qui déterminent la susceptibilité au risque d’un territoire, on a considéré comme étant édifiants pour la zone ’étude les suivants : géologie, pente, l’exposition des versants, l’utilisation des terrains. La carte à risque montre le niveau de l’exposition des certaines aires à un grand dangeret implique une évaluation quantitative stricte. Un niveau élevé de prédisposition au risque d’un territoire s’identifie en plan physique par une susceptibilité accrue aux processus géomorphologiques actuels spécifiques. Sur la base de plusieurs éléments cartographiques on a réalisé la carte de l’expansion des aires avec les processus géomorphologiques actuels dominants, et puis, sur la base des paramètres géographiques mentionnés antérieurement (ci-dessus, on a réalisé la carte du sque géomorphologique pour le bassin hydrographique Suha Mică. Notre étude est originale parce que, par la cartographie géomorphologique détailléeui a été réalisée avant la carte à risque, on a eu la possibilité de vérifier sur le terrain quel facteur est plus important pour l’exposition au risque des différentes unités des aires dansa zone étudiée. Par rapport aux autres réalisations de ce type, où la lithologie a un pourcentage maximum, dans notre cas, le facteur déterminant est la pente du versant. Cefait a mené à une réalisation cartographique plus véridique, fait qu’on a pu voir lors de la vérification de la carte à risque géomorphologique, sur la base de la carte de l

  1. Étude palynologique du Dévonien terminal et du Carbonifère inférieur du bassin d'Illizi (Fort-Polignac, Algérie Palynological Study of the Uppermost Devonian and Lower Carboniferous in the Illizi Basin (Fort-Polignac, Algeria

    Directory of Open Access Journals (Sweden)

    Attar A.

    2006-11-01

    Full Text Available L'étude de la microflore des formations Djebel llleréne, Issendjel, Assekaïfaf, Oubarakat et El Adeb Larache du bassin d'Illizi (Sahara algérien a permis d'établir, depuis le Dévonien terminal jusqu au Namurien, six palynozones. Une comparaison est faite avec les travaux de Lanzoni et Magloire et de Massa et al. (bassin de Rhadamès, Libye occidentale. A study of microflora from the Djebel Illeréne, Issendjel, Assekaïfaf, Oubarakat und El Adeb Larache formations in the Illizi Basin (Algerian Sahara has enabled six palynozones to be identified in the interval between the uppermost Devonian and the Namurian. The findings are compared with those by Lanzoni and Magloire (Grand Erg Occidental, Algerian Sahara and Massa et al. (Rhadamès Basin, western Libya.

  2. River Corridor Easements

    Data.gov (United States)

    Vermont Center for Geographic Information — A River Corridor Easement (RCE) is an area of conserved land adjacent to a river or stream that was conserved to permanently protect the lateral area the river needs...

  3. BILAN DES ACTIONS DU PLAN MIGRATEURS CONCERNANT L’ALOSE FEINTE (ALOSA FALLAX RHODANENSIS SUR LE BASSIN RHÔNE-MÉDITERRANÉE-CORSE.

    Directory of Open Access Journals (Sweden)

    LEBEL I.

    2001-07-01

    1991 a été réalisé pour amorcer la réflexion sur l’efficacité et l’orientation à donner au plan migrateurs pour compléter les objectifs prévus ainsi qu’optimiser et étendre le programme de restauration : - mettre en place un tableau de bord des indicateurs du potentiel « migrateurs », des actions de suivi et d’aménagement, afin d’améliorer la lisibilité du programme, A l’issue des sept années d’études et de travaux, l’objectif principal sur le Rhône est d’améliorer les connaissances d’un point de vue quantitatif mais également qualitatif avec l’évaluation du stock d’aloses et du flux migratoire sur le premier obstacle. Parallèlement, une extension du volet aloses du plan migrateurs aux autres bassins méditerranéens français a été engagée sur l’Aude, l’Hérault, le Vidourle, l’Argens et le Tavignano en Corse.

  4. Nouvelles précisions stratigraphiques concernat les bassins tertiaires du sud de la Turquie (Antalya, Mut, Adana New Statigraphic Dta on Tertiary Basins in Southern Turkey (Antalya, Mut, Adana

    Directory of Open Access Journals (Sweden)

    Bizon G.

    2006-11-01

    Full Text Available Cette étude stratigraphique, réalisée dans les bassins tertiaires du sud de la Turquie ouverts sur la Méditerranée, a permis de caractériser les différentes biozones du Tertiaire méditerranéen de l'Éocène inférieur au Pliocène. A l'ouest du bassin d'Anlalya la continuité des dépôts depuis le Crétacé terminal jusqu'au Langhien n'est pas interrompue par des lacunes importantes. Par contre à l'est (Antalya, Mut, Adana la transgression néogène (Burdigalian à Langhien est très nette sur les séries tectonisées, la série y est plus complète, comportant les niveaux évaporitiques du Miocène supérieur puis les marnes de Pliocène inférieur. Ces résultats sont complétés par une analyse micropoléontologique de quelques niveaux fossilifères du bassin de Mut où une espèce voisine de Globigerina ciperoensis Bolli (Oligocène se trouve associée en très grand nombre à une microfaune d'àge burdigalien supérieur à la population observée ici est très similaire à celle de la, Paratéthys mais rend difficile l'utilisation stratigraphique de l'espèce Globigerina ciperoensis dans le domaine méditerranéen. This stratigraphic survey made in the Tertiary basins in southern Turkey (all opening out into the Mediterranean served to characterize the différent Mediterranean Tertiary biozones from the early Eocene to the Pliocene. To the West of the Antalya Basin, the continuity of the deposits from the terminal Cretaceous to the Langhian is not interrupted by any large gaps. In the East, however (Antalya, Mut, Adana, the Neogene transgression (Burdigalian to Langhian is very clearcut on the tectonized bosement where the series is more complete and contains evaporitic levels from the laie Miocene and then early Pliocene marls. These findings are completed by a micropaleontological analysis of some fossiliferous horizons in the Mut Basin where a species similarto Globigerina ciperoensis Bolli (Oligocene is found in association

  5. 33 CFR 162.90 - White River, Arkansas Post Canal, Arkansas River, and Verdigris River between Mississippi River...

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01 false White River, Arkansas Post Canal... White River, Arkansas Post Canal, Arkansas River, and Verdigris River between Mississippi River, Ark... apply to: (1) Waterways. White River between Mississippi River and Arkansas Post Canal, Ark.; Arkansas...

  6. Andean contributions to the biogeochemistry of the amazon river system

    Directory of Open Access Journals (Sweden)

    1995-01-01

    Full Text Available LA CONTRIBUTION ANDINE A LA BIOGEOCHIMIE DE L’AMAZONE. Les fleuves andins ont vraisemblablement un rôle déterminant sur la biogéochimie de l’Amazone au Brésil. Les données disponibles sur le C organique, le NO3- et le PO43- des fleuves andins montrent des concentrations très variables et ne révèlent aucune relation avec leur altitude ou leur position dans le bassin. En général, les concentrations des fleuves andins sont semblables à celles du chenal principal et de ses principaux affluents. L’explication des phénomènes d’altération du matériel provenant des Andes ne peut être que spéculative. Cependant, l’atténuation du signal andin est liée à la décomposition et à l’ajout de matériel en aval des Andes. Les analyses de 13C sur la matière organique particulaire ou soluble du chenal principal de l’Amazone mettent en évidence qu’une fraction andine persiste dans le système fluvial qui se jette dans l’océan Atlantique. En 1994, un nouveau programme international de recherche a commencé pour mieux caractériser la biogéochimie des fleuves andins. CONTRIBUCIÓN ANDINA A LA BIOGEOQUÍMICA DEL RÍO AMAZONAS. Los ríos andinos podrían ejercer una influencia significativa sobre la biogeoquímica del Río Amazonas. Las concentraciones en C orgánico, NO3- y PO43- de los ríos andinos son altamente variables y no presentan claros patrones geográficos o altitudinos. En general, las concentraciones presentan valores similares a aquéllos observados en el Río Amazonas. Actualmente sólo existen explicaciones especulativas de los procesos que modifican el material de origen andino sin embargo, la atenuación de la señal andina es una consecuencia del proceso de descomposición y de la añadidura de materiales provenientes de las planicies bajas. El contenido de 13C en el material orgánico del Río Amazonas constituye una evidencia concreta de que cierta fracción del material andino persiste y es transportado hacia el

  7. One-dimensional Modeling of Macrobyte growth : part of the study Macrophytes and nutriments Dynamics in the upperreaches of the Scheldt Bassin

    OpenAIRE

    Strömbom, Susan

    2004-01-01

    Massive macrophyte development in the Flemish running waters in the northern part ofBelgium is a result of the improved water quality regarding organic loads in combination witha continuous high nutrient input. Since the macrophytes, higher aquatic plants with roots andstems, are contributing to the flooding problem in the Flemish regions by raising the waterlevel in rivers where the water level already is high, the macrophyte management is animportant issue in the Flemish areas. There are fe...

  8. Simulation de la sédimentation dans un bassin évaporitique à niveau d'eau sous influence eustatique. Application au bassin paléogène de Mulhouse (Alsace, France Simulation of Sedimentation in an Evaporitic Basin At Water Level under Eustatic Influence. Application to the Paleogene Mulhouse Basin (Alsace, France

    Directory of Open Access Journals (Sweden)

    Carpentier B.

    2006-11-01

    Full Text Available Le programme SIMSALT permet, à partir de fonctions sinusoïdales simulant des variations climatiques et eustatiques, de modéliser la sédimentation dans une maille élémentaire d'un bassin évaporitique en communication restreinte permanente avec l'océan, les arrivées d'eau marine se faisant par l'intermédiaire d'un seuil topographique. En fonction des salinités calculées, le programme détermine s'il y a précipitation de sels ainsi que les épaisseurs sédimentées. Les principaux résultats fournis sont représentés par des colonnes lithologiques en fonction des épaisseurs cumulées et en fonction du temps. Ce programme renferme également un module permettant de tester des fonctions simulant la production-dégradation de la matière organique. Ce modèle a été appliqué à une partie de la série évaporitique d'âge Eocène supérieur - Oligocène inférieur du bassin de Mulhouse. L'application du modèle aux cyclothèmes carottés du sondage Max montre que la sédimentation évaporitique et organique peut être contrôlée principalement par des variations climatiques résultant de la somme de trois sinusoïdes, respectivement de période de l'ordre de 13000, 500 et 100 ans, associées à des variations eustatiques de période 13000 ans déphasées par rapport aux variations climatiques de même période. Avec le modèle SIMSALT, il est donc possible de reconnaitre les influences respectives de l'eustatisme et du climat sur la sédimenation évaporitique et organique dans un bassin en communication restreinte avec le domaine marin. The SIMSALT program takes sinusoidal functions simulating climatic and eustatic variations and uses them to model sedimentation in an elementary mesh of an evaporitic basin in permanent restricted communication with the ocean, with arrivals of seawater being determined via a topographic threshold (Fig. 1. For this, the mesh is assumed to be made up of several superposed elements (Fig. 2, i. e. a

  9. Imagerie sismique d'un réservoir carbonaté : le dogger du Bassin parisien Seismic Imaging a Carbonate Reservoir: the Paris Basin Dogger

    Directory of Open Access Journals (Sweden)

    Mougenot D.

    2006-11-01

    Full Text Available Dans le cadre des mesures incitatives de relance de l'exploration en France prises par la Dhyca(1, six partenaires industriels(2 se sont réunis (Projet Dogger, 1991-93 pour développer une méthodologie d'acquisition, de traitement et d'interprétation sismique, adaptée à la description du réservoir à huile du Dogger du Bassin parisien et utilisant des techniques déjà industrialisées : vibrosismique à contenu fréquentiel élevé (10-130 Hz, sismique réflexion à 3 dimensions ou à 3 composantes, émissions P et S, traitement élaboré du signal et des statiques, préservation des amplitudes, calage aux puits, inversion stratigraphique, interprétation 3D par pointé automatique et attributs d'horizon. L'utilisation conjointe de toutes ces techniques sur les champs de Villeperdue (Total opérateur et de Fontaine-au-Bron (EAP opérateur montre l'adaptation de la sismique de surface à décrire certaines caractéristiques du réservoir mince (30 m situé au toit du Dogger carbonaté, à 1900 m de profondeur. L'élargissement du contenu fréquentiel de la sismique se heurte aux limites imposées par l'atténuation des hautes fréquences lors de leur propagation dans le sous-sol. L'évaluation de cette atténuation par un PSV indique un filtrage terrain jusqu'au Dogger (1,3 s td fortement amplifié au-delà de 90 Hz. La sismique 2D dite haute résolution (HR permet d'atteindre au niveau de l'objectif cette fréquence charnière qui fournit une résolution verticale suffisante pour que les réflexions situées au sommet et à la base du réservoir n'interfèrent pas (lambda/2 = 26 m. L'amplitude de ces réflexions est alors représentative des contrastes d'impédance de part et d'autre du réservoir et leurs variations latérales permettent de détecter des hétérogénéités, comme les variations de porosité, qui s'expriment bien acoustiquement. Le contenu en hautes fréquences de la sismique 3D (70 Hz a été plus difficile à am

  10. Assessing the human health risk for aluminium, zinc and lead in outdoor dusts collected in recreational sites used by children at an industrial area in the western part of the Bassin Minier de Provence, France

    Science.gov (United States)

    Reis, A. P.; Patinha, C.; Noack, Y.; Robert, S.; Dias, A. C.; Ferreira da Silva, E.

    2014-11-01

    The Western part of the “Bassin Minier de Provence”, a former coal mining area, is still occupied by old polluting industries such as a coal-fired power plant and an alumina factory. In 2011 a preliminary outdoor dust survey was carried out in the area as the first step to an exposure and health risk assessment study. Dust samples were taken at 19 sites distributed across the study area, depending on the location of recreational areas used by children to play outdoors. Pseudo-total concentrations of Al, Zn and Pb were determined by ICP-MS and bioaccessible concentrations were estimated using the Unified BARGE Method. Exposure was calculated according to a scenario evaluation approach for dust ingestion and dermal contact routes. Estimation of health risk for exposure to Al, Zn and Pb in outdoor dust was based on the summation of individual risks for the oral and dermal routes. Results show that Al occurs in very high concentrations but mainly innon-bioaccessible forms, especially near the alumina plant. Zinc and Pb occur in low-average levels but mainly in bioaccessible forms. The estimated potential risk decreases according to Pb ≫ Al > Zn and is lower for the ingestion route. The preliminary results presented in this study indicate that, for Al and Zn, the outdoor dusts of the BMP represent an acceptable risk to children's health. However, the estimated hazard quotients suggest that there is some health risk associated to environmental Pb.

  11. L'enregistrement géomorphologique de la tectonique quaternaire par les nappes alluviales : l'exemple du bassin de la Têt (Roussillon, France)

    Science.gov (United States)

    Carozza, Jean-Michel; Delcaillau, Bernard

    1999-11-01

    In a low sismo-tectonic activity zone, the geometry of a Quaternary alluvial body can be used as a neotectonic tracer tool. Geometry characteristics of individualized terrace levels are extracted from a Digital Elevation Model by superposing elevation and geological data. The longitudinal profile of each terrace is compared to the best fitting exponential theoretical profile, deduced from hydrodynamic parameters. This analysis, applied to the Têt river terraces (Mediterranean southern France) shows the splitting of a sedimentary body, corresponding to hydrodynamic break interpreted as morphostructural segmentation of the Roussillon basin.

  12. River pollution control

    National Research Council Canada - National Science Library

    Stiff, M.J

    1980-01-01

    Readers will gain an insight into the problems of other countries, particularly those with trans-frontier rivers, the measures adopted to improve river quality, and how the World Health Organization...

  13. Allegheny County Major Rivers

    Data.gov (United States)

    Allegheny County / City of Pittsburgh / Western PA Regional Data Center — This dataset contains locations of major rivers that flow through Allegheny County. These shapes have been taken from the Hydrology dataset. The Ohio River,...

  14. Illinois River NWFR HMP

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The Illinois River National Wildlife and Fish Refuges Complex stretches along 124 miles of the Illinois River in west central Illinois. The Complex includes three...

  15. Iowa's Sovereign Meandered Rivers

    Data.gov (United States)

    Iowa State University GIS Support and Research Facility — This data set depicts Iowa's Meandered Rivers. These rivers are deemed sovereign land & therefore require any person wishing to conduct construction activities...

  16. Measuring River Pollution

    Science.gov (United States)

    Ayyavoo, Gabriel

    2004-01-01

    The Don River watershed is located within Canada's most highly urbanized area--metropolitan Toronto. Many residential and commercial uses, including alterations to the river's course with bridges, have had a significant impact on the Don's fauna and flora. Pollutants have degraded the river's water quality, a situation exacerbated by the…

  17. River basin administration

    Science.gov (United States)

    Management of international rivers and their basins is the focus of the Centre for Comparative Studies on (International) River Basin Administration, recently established at Delft University of Technology in the Netherlands. Water pollution, sludge, and conflicting interests in the use of water in upstream and downstream parts of a river basin will be addressed by studying groundwater and consumption of water in the whole catchment area of a river.Important aspects of river management are administrative and policy aspects. The Centre will focus on policy, law, planning, and organization, including transboundary cooperation, posing standards, integrated environmental planning on regional scale and environmental impact assessments.

  18. ÉVOLUTION SPATIO-TEMPORELLE DE LA CONTRIBUTION DU REPEUPLEMENT EN TRUITE (SALMO TRUTTA L. RÉALISÉ A DES STADES PRÉCOCES DANS LE BASSIN AMONT DU FIER (74.

    Directory of Open Access Journals (Sweden)

    CAUDRON A.

    2002-04-01

    Full Text Available Les pratiques de repeuplement en truite à des stades précoces (alevins nourris et truitelles 3-5 cm ont été évaluées par la technique de fluoromarquage des otolithes sur le bassin amont du Fier pour trois cohortes (1995, 1996, 1997. La contribution du repeuplement et du recrutement naturel a été suivie à la fois dans la population en place et dans les captures par pêche à la ligne. Au stade 0+ en place à l’automne, la contribution des poissons alevinés est relativement importante pour les trois cohortes considérées. Cependant, l’analyse du rapport entre le nombre d’alevins introduits au printemps et le nombre de truitelles recapturées à l’automne fait apparaître un taux d’implantation très faible des 0+ marqués quelle que soit la densité alevinée. La contribution des marqués chute brutalement au stade 1+ en place (cohorte 95 et 96 et devient très faible. Cette tendance se poursuit au stade 2+ en place pour la cohorte 95 avec des taux de marqués qui diminuent encore. Dans les captures par pêche à la ligne le taux de 2+ marqués est supérieur à celui observé dans la population en place à l’automne mais la contribution du recrutement naturel reste toujours dominante. Ensuite, la contribution de repeuplement suit la même dynamique que dans la population en place puisqu’il diminue avec l’âge. Elle devient négligeable au stade 3+ et nulle à partir de 4+.

  19. Rivers: Nature's Wondrous Waterways.

    Science.gov (United States)

    Harrison, David L.

    Rivers play a vital role in the life of the planet. They provide water for wildlife, plant life, and people, and they help to fertilize fields where corn and other crops grow. But how were these rivers made? This children's book takes readers/students on a journey down a river from its source at the top of a mountain to its mouth where it meets…

  20. Evolution of river dolphins.

    OpenAIRE

    Hamilton, H.; Caballero, S.; Collins, A. G.; Brownell, R. L.

    2001-01-01

    The world's river dolphins (Inia, Pontoporia, Lipotes and Platanista) are among the least known and most endangered of all cetaceans. The four extant genera inhabit geographically disjunct river systems and exhibit highly modified morphologies, leading many cetologists to regard river dolphins as an unnatural group. Numerous arrangements have been proposed for their phylogenetic relationships to one another and to other odontocete cetaceans. These alternative views strongly affect the biogeog...

  1. Down to the River

    DEFF Research Database (Denmark)

    Wessels, Josepha Ivanka

    2015-01-01

    Currently there is no coherent or sustainable water cooperation among the five states—Israel, Jordan, Lebanon, Palestinian territories and Syria—that share the Jordan River. Why do people not cooperate on sustainable river basin management, even if it seems the most rational course from...... to illustrate hydropolitics in praxis, because the political future of this particular area in many respects affects the sustainable future of the Jordan River Basin and the entire Levant....

  2. Continuité ou discontinuité de sémentation marine mio-pliocène en Méditerranée occidentale. L'example du bassin de vera (Espagne méridionale Continuity Or Discontinuity of Io-Pliocene Marine Sedimentation in the Western Mediterranean. Example of the Vera Basin (Southern Spain

    Directory of Open Access Journals (Sweden)

    Montenat C.

    2006-11-01

    Full Text Available L'étude du bassin néogène de Vera apporte des données fort instructives pour l'interprétation du a phénomène Mio-Pliocène » en Méditerranée occidentale. a Au point de vue biostratigraphique La coupe de Cuevas del Almanzora permet d'observer, pour la première fois en Méditerranée, une succession continue de foraminifères planctoniques du Messinien au Pliocène inférieur. Les biozones à G. acostaensis, G. humerosa-G. duterérei, G. mediterranea-G. conomiozea et G. margaritae se succèdent sans hiatus évolutif. b Au point de vue géodynamique Le bassin de Vera montre une grande variété dans les modalités du passage Miocène-Pliocène, depuis des discordances à la périphérie du bassin jusqu'à une sédimentation vaseuse continue en son centre. L'étude des profils sismiques offshore montre de nombreux exemples comparables, en relation avec le comportement structural du substratum fragmenté en horst et graben mobiles. Des mouvements tectoniques distensifs ont eu lieu à la limite Miocène-Pliocène. Ils ont eu pour résultat un approfondissement relatif des bassins méditerranéens mais ceci ne représente qu'un épisode parmi d'autres d'un processus de distension inauguré au Miocène supérieur et qui s'est prolongé jusqu'au début du Quaternaire. II semble prudent en tous cas, de ne pas exagérer cet approfondissement de la mer au Pliocène. c Au point de vue paléogéographique L'exemple du bassin de Vera prouve la pérennité des conditions marines durant le Messinien du moins dans certaines parties de la Méditerranée. Ceci implique naturellement des liaisons continues avec l'Atlantique, et exclut un dessèchement général du bassin méditerranéen durant les temps messiniens. La paléogéographie de la zone bétique durant le Miocène supérieur est caractérisée par une extrême compartimentation du domaine marin constitué de bassins subsidents, communiquant par des seuils. Cette compartimentation s

  3. Utilisation du foncier agricole à des fins de culture de Jatropha dans le Bassin arachidier sénégalais: une démarche controversée et des gains pas à la hauteur des attendus du programme

    Directory of Open Access Journals (Sweden)

    Aminata Ndour

    2017-10-01

    Full Text Available Durant les années 2000, le secteur énergétique mondial a connu un tourment décisif du fait de la diminution des réserves, de la demande importante et surtout de la fluctuation des prix du pétrole. Le Sénégal, pays dépendant encore des énergies fossiles, s’est engagé dans une politique de diversification énergétique. Par conséquent, un programme biocarburant est initié. Le Bassin Arachidier est un des espaces sollicités pour l’application des politiques de promotion des biocarburants. Une zone du production agricole a accueilli une innovation énergétique. Ce fait marquant a guidé nos interrogations sur les problèmes énergétiques qui ont incité la culture de Jatropha dans le Bassin Arachidier. De façon spécifique, notre analyse de la filière Jatropha précise les stratégies déployées. Il est questions dans ce cas d’étudier les effets de Jatropha sur l’espace de production et les conditions de vie des agriculteurs, des risques de réduction des superficies de cultures traditionnelles.

  4. Mise en évidence de Provinces géochimiques dans les schistes bitumeux du Toarcien de l'est du bassin de Paris Geocheminical Provinces Revealed in Toarcien Oil Shales in the Eastern Paris Basin. Analysis of the Soluble Organic Fraction

    Directory of Open Access Journals (Sweden)

    Huc A. Y.

    2006-11-01

    Full Text Available L'étude de la matière organique soluble dans le chloroforme des schistes du Toarcien de la partie orientale du bassin de Paris met en évidence l'existence d'une province géochimique nord et d'une province géochimique sud dont la frontière commune se trouve dans la région de Fécocourt. La province septentrionale se caractérise par une influence du domaine continental (massif des Ardennes au niveau de l'apport organique. Alors que la province méridionale se révèle exempt d'apport terrestre. Ces résultats sont en accord avec les indications sédimentologiques fournies par la littérature et apportent une dimension géochimique à la paléogéographie de ce bassin. An anaalysis of soluble organic motter in the chloroform from Toarcian shales from the eastern part of the Paris Basin reveals the existence of a northern geochemical province and a southern geochemical province whose commun boundary lies in the Fecocourt region. The northern province is characterized by the influence of the continental domain (Ardennes range with regard to organic influx, whereas no terrestrial influx is found in the southern province. These findings agree with the sedimentological indications supplied by the literature and add a geochemical dimension to the paleogeography of this basin.

  5. Characterisation of the hydrogeology of the Augustus River catchment, Western Australia

    Science.gov (United States)

    Wilkes, Shane M.; Clement, T. Prabhakar; Otto, Claus J.

    Understanding the hydrogeology of weathered rock catchments is integral for the management of various problems related to increased salinity within the many towns of Western Australia. This paper presents the results of site characterisation investigations aimed at improving the overall understanding of the hydrogeology of the southern portion of the Augustus River catchment, an example of a weathered rock catchment. Site data have highlighted the presence of both porous media aquifers within the weathered profile and fractured rock aquifers within the basement rocks. Geophysical airborne surveys and other drilling data have identified a large number of dolerite dykes which crosscut the site. Fractured quartz veins have been found along the margins of these dolerite dykes. Detailed groundwater-level measurements and barometric efficiency estimates indicate that these dolerite dykes and fractured quartz veins are affecting groundwater flow directions, promoting a strong hydraulic connection between all aquifers, and also influencing recharge mechanisms. The hydrogeological significance of the dolerite dykes and fractured quartz veins has been assessed using a combination of high-frequency groundwater-level measurements (30-min sampling interval), rainfall measurements (5-min sampling interval) and barometric pressure fluctuations (30-min sampling interval). A conceptual model was developed for describing various hydrogeological features of the study area. The model indicates that fractured quartz veins along the margins of dolerite dykes are an important component of the hydrogeology of the weathered rock catchments. Comprendre l'hydrogéologie des bassins en roches altérées est essentiel pour la gestion de différents problèmes liés à l'augmentation de la salinité dans de nombreuses villes d'Australie occidentale. Cet article présente les résultats d'études de caractérisation de sites conduites pour améliorer la compréhension de l'hydrogéologie de la

  6. River Corridors (Jan 2, 2015)

    Data.gov (United States)

    Vermont Center for Geographic Information — River corridors are delineated to provide for the least erosive meandering and floodplain geometry toward which a river will evolve over time. River corridor maps...

  7. Organiser la proximité entre usagers de l’eau : le cas de la Gestion Volumétrique dans le Bassin de la Charente

    Directory of Open Access Journals (Sweden)

    Céline Granjou

    2006-05-01

    Full Text Available Depuis les années 90 en Charente, la Gestion Volumétrique (GV vise à réduire les conflits liés au poids de l’irrigation sur la ressource en eau. Nous proposons ici de recourir au cadre d’analyse des proximités afin de formuler une évaluation sociologique du dispositif de gestion concertée de l’eau que constitue la GV. À partir d’entretiens auprès des acteurs de l’eau (irrigants, pêcheurs, riverains, acteurs du tourisme…, nous montrons que si la GV instaure une nouvelle proximité autour de règles d’organisation, celle-ci demeure asymétrique (privilégiant une proximité sectorielle autour de l’irrigation, instrumentale (absence d’un projet partagé de développement territorial, et enfin partielle au sens où n’est pas prise en compte la diversité des interdépendances de proximité autour de l’eau.Since the 90’s in the French region watered by the river Charente water resources have been weighed down with irrigation. In order to reduce conflicts which are linked to this situation, «Volumetric Management » introduces some new rules for irrigation practices including consultation. We propose to make a sociological assessment of the Volumetric Management basing on the notion of proximity with its different meanings. Several interviews with water users (farmers which use or don’t use water, fishers, residents, actors responsible for tourism… show that a new proximity due the share of organisation rules has been developed, but that this proximity is: asymmetric because it privileges links between partisans of irrigation; instrumental because it lacks a commune long-term vision of territorial development; at last partial because the different interdependencies induced by the same water resource are not considered.

  8. Modelling river dune development

    NARCIS (Netherlands)

    Paarlberg, Andries; Weerts, H.J.T.; Dohmen-Janssen, Catarine M.; Ritsema, I.L; Hulscher, Suzanne J.M.H.; van Os, A.G.; Termes, A.P.P.

    2005-01-01

    Since river dunes influence flow resistance, predictions of dune dimensions are required to make accurate water level predictions. A model approach to simulate developing river dunes is presented. The model is set-up to be appropriate, i.e. as simple as possible, but with sufficient accuracy for

  9. Evolution of river dolphins.

    Science.gov (United States)

    Hamilton, H; Caballero, S; Collins, A G; Brownell, R L

    2001-03-07

    The world's river dolphins (Inia, Pontoporia, Lipotes and Platanista) are among the least known and most endangered of all cetaceans. The four extant genera inhabit geographically disjunct river systems and exhibit highly modified morphologies, leading many cetologists to regard river dolphins as an unnatural group. Numerous arrangements have been proposed for their phylogenetic relationships to one another and to other odontocete cetaceans. These alternative views strongly affect the biogeographical and evolutionary implications raised by the important, although limited, fossil record of river dolphins. We present a hypothesis of river dolphin relationships based on phylogenetic analysis of three mitochondrial genes for 29 cetacean species, concluding that the four genera represent three separate, ancient branches in odontocete evolution. Our molecular phylogeny corresponds well with the first fossil appearances of the primary lineages of modern odontocetes. Integrating relevant events in Tertiary palaeoceanography, we develop a scenario for river dolphin evolution during the globally high sea levels of the Middle Miocene. We suggest that ancestors of the four extant river dolphin lineages colonized the shallow epicontintental seas that inundated the Amazon, Paraná, Yangtze and Indo-Gangetic river basins, subsequently remaining in these extensive waterways during their transition to freshwater with the Late Neogene trend of sea-level lowering.

  10. Nipigon River landslide, 1990

    Energy Technology Data Exchange (ETDEWEB)

    Radhakrishna, H.S.; Lau, K.C.

    1992-11-24

    On April 23, 1990, a landslide occurred on the east bank of the Nipigon River in Ontario, 8 km downstream from the Alexander Generating Station. A study was initiated to assess the impact of river level fluctuations caused by the hydropower plant operation on the downstream banks of the river. A detailed geotechnical investigation and field study of river drawdown effects on the riverbank slopes were performed. A final analysis of the failure is presented which shows that the high groundwater conditions and soft soils present in the area led to the massive landslide. The impact of the river level fluctuations on the slope stability was found to be minor compared to that of the high groundwater conditions that were produced by the rapid thaw of snow and infiltration in the recharge area. 15 refs., 16 figs., 6 tabs.

  11. L'habitat en village à l'époque préhispanique dans le bassin Shaka-Palcamayo, département de Junín - Pérou

    Directory of Open Access Journals (Sweden)

    1978-01-01

    Full Text Available Cet article expose les premiers résultats obtenus dans l'étude de l'occupation humaine à l'époque tardive (Intermédiaire récent, Xle-XVe siècle dans le bassin Shaka-Palcamayo (Andes centrales du Pérou. 38 sites, à une altitude moyenne de 4000 mètres, sont portés sur la carte, dont 25 villages, 12 sites d'enclos, de terrasses et de structures funéraires, ainsi qu'une saline. Les sites d'enclos et de terrasses permettent de voir comment cette population d'agriculteurs-éleveurs exploitait le milieu. Les villages sont étudiés du point de vue de leur insertion dans le paysage (implantation en position dominante et stratégique, de leurs aménagements défensifs (fortifications, de leur organisation interne (voies de circulation, aire de dégagement, et de leurs structures d'habitation. Este articulo expone los primeros resultados del estudio de la ocupación humana en la época tardía, o sea el Intermedio tardío (siglos XI - XV en la cuenca del río Shaka-Palcamayo (Andes centrales del Perú. 38 sitios, a unos 4000 metros de altura, son anotados en el mapa, de los cuales 25 son pueblos, 12 sitios de corrales, de andenes y de estructuras funerarias, y por fin 1 pozo salino. Los sitios de corrales y de andenes permiten ver como esta población sedentaria de agricultores-ganaderos explotaba el medio. Los pueblos son estudiados por su inserción en el paisaje (ubicación en posición dominante y estratégica, por sus instalaciones defensivas (fortificaciones, por su organización interna (caminos de circulación, eras de despejo, y por sus estructuras de vivienda.

  12. Monogènes de Clarias (Siluriformes, Clariidae au Cameroun : II. description de trois nouvelles espèces du genre Birgiellus n. gen. (Dactylogyridea, Ancyrocephalidae dans le Bassin du Nyong

    Directory of Open Access Journals (Sweden)

    Bilong Bilong C.F.

    2007-06-01

    Full Text Available L’étude des monogènes parasites branchiaux de trois espèces de poissons du genre Clarias Scopoli, 1777 (Clariidae : C. pachynema, C. jaensis et C. camerunensis, pêchés dans le bassin du Nyong (Cameroun a permis de récolter trois nouvelles espèces placées dans le nouveau genre Birgiellus, respectivement Birgiellus mutatus n. sp. chez Clarias pachynema, B. calaris n. sp. chez C. jaensis et B. kellensis n. sp. chez C. camerunensis. Le genre Birgiellus, voisin du genre Quadriacanthus, s’en distingue par la morphologie de la barre transversale ventrale formée d’une pièce unique (deux bras distincts chez Quadriacanthus et par les uncinuli IV peu différents des autres (plus grands chez les Quadriacanthus. Birgiellus calaris diffère de B. mutatus par les anchors ventraux plus longs et plus épais, la morphologie de la barre transversale ventrale, la taille des pièces sclérifiées des appareils copulateurs mâle et femelle, avec la pièce accessoire mâle munie d’un talon, un manche trapézoïdal plus long et un crochet plus épais. Birgiellus kellensis, proche de B. calaris, s’en écarte par la taille plus faible des anchors dorsaux et ventraux, des barres transversales, du pénis, et de la pièce accessoire male, sans talon, mais avec une lame mince supplémentaire. En référence à l’article 8.5.2 du Code international de nomenclature zoologique (1999, le genre Birgiellus et les espèces B. mutatus et B. calaris remplacent respectivement le genre Claridectes et les espèces C. clarisa et C. alacris, initialement décrits par Birgi (1987, mais dont les spécimens n’ont jamais été déposés dans un musée. L’étude de la spécificité parasitaire de ces trois espèces montre qu’elle est du type oïoxène.

  13. Numerical modelling of river processes: flow and river bed deformation

    NARCIS (Netherlands)

    Tassi, P.A.

    2007-01-01

    The morphology of alluvial river channels is a consequence of complex interaction among a number of constituent physical processes, such as flow, sediment transport and river bed deformation. This is, an alluvial river channel is formed from its own sediment. From time to time, alluvial river

  14. Mixing in a river

    Energy Technology Data Exchange (ETDEWEB)

    Bernath, L.; Menegus, R.L.; Ring, H.F.

    1956-05-09

    Many rivers are burdened with tributary streams of warm water and/or liquid wastes containing dissolved or suspended matter. The warm water and waste matter mix thoroughly with the river water some distance downstream from the point of entry of the tributary, but near the point of entry there may be high local temperatures or concentrations of waste. It is often necessary to know the local temperatures or concentrations of waste. The authors have used a formula for computing the turbulent mixing that takes place in such a situation; this formula fits quite well in the case of one Southern river.

  15. La migration des hydrocarbures dans les bassins sédimentaires: aspects géologiques et géochimiques Migration of Hydrocarbons in Sedimentary Basins: Geological and Geochemical Aspects

    Directory of Open Access Journals (Sweden)

    Tissot B. P.

    2006-11-01

    Full Text Available La migration du pétrole vers les réservoirs et les pièges, et particulièrement son expulsion hors de la roche-mère où il s'est formé (migration primaire, est demeurée longtemps un des problèmes les plus mal connus de toute la géologie pétrolière. Le déplacement du pétrole et du gaz s'effectue en phase hydrocarbure séparée. L'eau, souvent considérée comme le véhicule du pétrole dans la migration, joue en fait un rôle négatif : il faut que la saturation en eau ait suffisamment diminué (par expulsion et que la saturation en hydrocarbures ait suffisamment augmenté (par génération à partir du kérogène pour que l'écoulement d'une phase hydrocarbure devienne possible. Le moteur de cette expulsion est le gradient de pression : l'élévation de la pression dans l'espace poreux des roches-mères résulte de trois causes (la charge sédimentaire, la genèse des hydrocarbures, et l'expansion thermique de l'eau. La microfissuration, qui survient quand la pression interne des fluides dépasse la résistance mécanique de la roche peut jouer un rôle important. Les observations dans les bassins sédimentaires de cas bien documentés sont encore trop rares. Il est, en particulier, difficile de calculer les réserves mobilisées à l'échelle d'un permis ou d'un bassin. La modélisation numérique de la migration, associée à celle de la genèse du pétrole et du gaz, offre des perspectives dans ce sens, mais elle demande encore des travaux complémentaires. Parmi les conséquences de la migration, on peut citer : la possibilité de corrélation huile/roche-mère, la teneur plus faible en produits lourds dans les réservoirs que dans les roches-mères et le rôle souvent joué par un déplacement où hydrocarbures liquides et gazeux forment une phase unique, qui migre en laissant progressivement derrière elle les fractions plus lourdes, par condensation rétrograde. Oil migration toward reservoirs and traps, and especially its

  16. Wild and Scenic Rivers

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — This map layer portrays the linear federally-owned land features (i.e., national parkways, wild and scenic rivers, etc.) of the United States, Puerto Rico, and the...

  17. The Carmans River Story

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — In this study, undertaken as an independent project at Bellport High School, the authors have attempted to provide a historical description of the Carmans River area...

  18. Management recommendations: Bear River

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This document is a review of land management practices at the Bear River Migratory Bird Refuge, by a land use specialist. Recommendations, time frame and additional...

  19. River research programme

    CSIR Research Space (South Africa)

    Ferrar, AA

    1988-01-01

    Full Text Available The need for a comprehensive, multidisciplinary research programme for river ecosystems is described. The scope of the programme needs to include basic descriptions of a systems and biota, the testing and development of functional theory...

  20. Russian River Analysis

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This document is an analysis and summary of progress toward achieving the interim management objectives for the Russian River during the 1979 season. Additionally,...

  1. Connecticut River Hydrologic Observatory

    Science.gov (United States)

    Ballestero, T. P.

    2004-12-01

    The Connecticut River basin possesses some characteristics that make it unique for studying hydrologic issues that transcend scale. The watershed was first dramatically altered through natural processes (glaciation) and then heavily impacted by human stresses (dams, deforestation, acid precipitation/deposition), only to exhibit recent decades of return to a more natural state (reforestation, land conservation, stream restoration, pollution abatement, and dam removal). The watershed is sufficiently north to be classified as a cold region. More specifically to hydrology, the watershed exhibits the spectrum of flooding problems: ice dams, convective storms, hurricanes, rain on melting snow, and low pressure systems. The 28,000 square kilometer Connecticut River Watershed covers one third of the states of New Hampshire, Vermont, Massachusetts, and Connecticut. The >640-km long rivers' headwaters start on the Canadian border at the Fourth Connecticut Lake, and flows southward to discharge in Long Island sound. The lower 100 km of river are tidally influenced. The Connecticut River is responsible for 70 % of the freshwater inflow to Long Island Sound. The Connecticut River is a sixth order stream that exhibits a dendritic pattern in an elongated scheme. This setting therefore affords many first and second order streams in almost parallel fashion, flowing west or east towards the central Connecticut River spine. There are 38 major tributaries to the mainstem Connecticut River, and 26 of these tributaries drain greater than 250 square kilometers. There is in excess of 30,000 km of perennially flowing stream length in the watershed. For more information, see: http://www.unh.edu/erg/connho/

  2. The rivers of civilization

    Science.gov (United States)

    Macklin, Mark G.; Lewin, John

    2015-04-01

    The hydromorphic regimes that underpinned Old World river-based civilizations are reviewed in light of recent research. Notable Holocene climatic changes varied from region to region, whilst the dynamics of floodplain environments were equally diverse, with river channel changes significantly affecting human settlement. There were longer-term trends in Holocene hydroclimate and multi-centennial length 'flood-rich' and 'flood-poor' episodes. These impacted on five identified flooding and settlement scenarios: (i) alluvial fans and aprons; (ii) laterally mobile rivers; (iii) rivers with well-developed levees and flood basins; (iv) river systems characterised by avulsions and floodouts; and (v) large river-fed wetlands. This gave a range of changes that were either more or less regular or incremental from year-to-year (and thus potentially manageable) or catastrophic. The latter might be sudden during a flood event or a few seasons (acute), or over longer periods extending over many decades or even centuries (chronic). The geomorphic and environmental impacts of these events on riparian societies were very often irreversible. Contrasts are made between allogenic and autogenic mechanism for imposing environmental stress on riverine communities and a distinction is made between channel avulsion and contraction responses. Floods, droughts and river channel changes can precondition as well as trigger environmental crises and societal collapse. The Nile system currently offers the best set of independently dated Holocene fluvial and archaeological records, and the contrasted effects of changing hydromorphological regimes on floodwater farming are examined. The persistence of civilizations depended essentially on the societies that maintained them, but they were also understandably resilient in some environments (Pharaonic Egypt in the Egyptian Nile), appear to have had more limited windows of opportunity in others (the Kerma Kingdom in the Nubian Nile), or required

  3. Évaluation spatiale et prospectives sur le risque de pollution diffuse par le nitrate sur le bassin versant de la Bultière Spatial evaluation and prospective risk of diffuse pollution by modeling on the catchment area of Bultiere

    OpenAIRE

    LE FLAHEC, François

    2012-01-01

    En France, la protection des captages d'eau potable est une préoccupation majeure : le Grenelle Environnement a identifié plus de cinq cents sites menacés par les pollutions diffuses, d'où la nécessité de mettre en place des plans d'action pour les protéger. En Vendée, dans le bassin versant de la Bultière, confronté à des rejets importants de nitrate, une étude par modélisation agronomique et hydrologique a été mise en œuvre avec le logiciel Swat, un outil alliant analyse spatiale et simulat...

  4. Wind River: A Wild and Scenic River Analysis: Preliminary draft

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The Wind River meets the criteria for inclusion in the National Wild and Scenic Rivers System. Subject to valid existing rights, the minerals in Federal lands which...

  5. The Colorado River

    Science.gov (United States)

    2002-01-01

    This Moderate-resolution Imaging Spectroradiometer (MODIS) true-color image shows the passage of the Colorado River through several southwestern states. The river begins, in this image, in Utah at the far upper right, where Lake Powell is visible as dark pixels surrounded by the salmon-colored rocks of the Colorado Plateau. The Colorado flows southwest through Glen Canyon, to the Glen Canyon Dam, on the Utah-Arizona border. From there it flows south into Arizona, and then turns sharply west where the Grand Canyon of the Colorado cuts through the mountains. The Colorado flows west to the Arizona-Nevada (upper left) border, where it is dammed again, this time by the Hoover Dam. The dark-colored pixels surrounding the bend in the river are Lake Mead. The river flows south along the border of first Nevada and Arizona and then California and Arizona. The Colorado River, which begins in Rocky Mountain National Park in Colorado, empties into the Gulf of California, seen at the bottom center of this image.

  6. 50 CFR 226.205 - Critical habitat for Snake River sockeye salmon, Snake River fall chinook salmon, and Snake River...

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 7 2010-10-01 2010-10-01 false Critical habitat for Snake River sockeye salmon, Snake River fall chinook salmon, and Snake River spring/summer chinook salmon. 226.205 Section... Snake River sockeye salmon, Snake River fall chinook salmon, and Snake River spring/summer chinook...

  7. 33 CFR 207.380 - Red Lake River, Minn.; logging regulations for portion of river above Thief River Falls.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false Red Lake River, Minn.; logging... Red Lake River, Minn.; logging regulations for portion of river above Thief River Falls. (a) Parties wishing to run logs on Red Lake River must provide storage booms near the head of the river to take care...

  8. 33 CFR 117.734 - Navesink River (Swimming River).

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Navesink River (Swimming River). 117.734 Section 117.734 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY... (Swimming River). The Oceanic Bridge, mile 4.5, shall open on signal; except that, from December 1 through...

  9. Skjern River Restoration Counterfactual

    DEFF Research Database (Denmark)

    Clemmensen, Thomas Juel

    2014-01-01

    of Dissonance in Nature Restoration’, Journal of Landscape Architecture 2/2014: 58-67. Danish Nature Agency (2005), Skjern Å: Ådalens historie. De store projekter. Det nye landskab og naturen. På tur i ådalen [The Skjern River: The History of the River Delta. The Big Projects. The New Landscape and Nature......In 2003 the Skjern River Restoration Project in Denmark was awarded the prestigious Europa Nostra Prize for ‘conserving the European cultural heritage’ (Danish Nature Agency 2005). In this case, however, it seems that the conservation of one cultural heritage came at the expense of another cultural...... history and more openness towards constant change. In this approach the idea of palimpsest as metaphor for the cultural landscape plays an important role. Rather than being an obstacle for the restoration of nature, the historical layer following the comprehensive cultivation project from the 1960s...

  10. Missouri River 1943 Compact Line

    Data.gov (United States)

    Iowa State University GIS Support and Research Facility — Flood Control, Bank Stabilization and development of a navigational channel on the Missouri River had a great impact on the river and adjacent lands. The new...

  11. Sprague River Oregon Bars 1968

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  12. Sprague River Oregon Centerline 2005

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  13. Sprague River Oregon Floodplain 1968

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  14. Sprague River Oregon Floodplain 1940

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  15. Sprague River Oregon Centerline 2000

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  16. Sprague River Oregon Centerline 1975

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  17. Haw River PFCs Data Set

    Data.gov (United States)

    U.S. Environmental Protection Agency — PFAS concentrations in river and drinking water in and around the Haw River in North Carolina. This dataset is associated with the following publication: Sun, M., E....

  18. Sprague River Oregon Centerline 1968

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  19. Two Pontic rivers

    DEFF Research Database (Denmark)

    Bekker-Nielsen, Tønnes; Jensen, Marit

    2015-01-01

    The accounts of the landscape around the Iris (Yeşilirmak) and the Thermodon (Terme) given by ancient authors are diverse and often contradictory. The Periegesis of the World by Dionysius of Alexandria, a didactic poem written in the early IInd c. A.D., established an image of the two rivers...... that does not correspond to their actual characteristics. A closer study reveals that Dionysius, or possibly his source, has confused the two: the river which he describes as the Thermodon is in fact the Iris, and vice versa. This mistake was not realized by later translators (Avienus, late IVth c. A...

  20. modelisation du comportement hydrologique du bassin versant

    African Journals Online (AJOL)

    LGE

    mathématiques reproduisant, à l‟échelle journalière, les différents transferts de masse (Figure 2). Le niveau de l‟eau dans le réservoir "SOL" est utilisé pour déterminer l‟évaporation, l‟infiltration et les évacuations qui reproduisent le ruissellement de surface, et le ruissellement retardé. La méthode utilisée pour le calcul ...

  1. Gouvernance communautaire des milieux humides du bassin ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Cette initiative permettra de mieux comprendre les activités de gestion des terres et ses modes d'occupation, ce qui permettra d'améliorer les moyens de subsistance de gens pauvres et d'en assurer leur maintien ... Community Based Natural Resource Management in the Greater Limpopo Trans Frontier Conservation Area.

  2. Nowitna River goose survey, 1986

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — An aerial goose survey of the upper Nowitna River and a river-floating goose brood survey of the upper Nowitna River were conducted May 27th through July 5th of...

  3. Stochastic Modelling of River Geometry

    DEFF Research Database (Denmark)

    Sørensen, John Dalsgaard; Schaarup-Jensen, K.

    1996-01-01

    Numerical hydrodynamic river models are used in a large number of applications to estimate critical events for rivers. These estimates are subject to a number of uncertainties. In this paper, the problem to evaluate these estimates using probabilistic methods is considered. Stochastic models for ...... for river geometries are formulated and a coupling between hydraulic computational methods and numerical reliability methods is presented....

  4. Geomorphic classification of rivers

    Science.gov (United States)

    J. M. Buffington; D. R. Montgomery

    2013-01-01

    Over the last several decades, environmental legislation and a growing awareness of historical human disturbance to rivers worldwide (Schumm, 1977; Collins et al., 2003; Surian and Rinaldi, 2003; Nilsson et al., 2005; Chin, 2006; Walter and Merritts, 2008) have fostered unprecedented collaboration among scientists, land managers, and stakeholders to better understand,...

  5. The River Rock School.

    Science.gov (United States)

    Gereaux, Teresa Thomas

    1999-01-01

    In the early 1920s, the small Appalachian community of Damascus, Virginia, used private subscriptions and volunteer labor to build a 15-classroom school made of rocks from a nearby river and chestnut wood from nearby forests. The school building's history, uses for various community activities, and current condition are described. (SV)

  6. Discover the Nile River

    Science.gov (United States)

    Project WET Foundation, 2009

    2009-01-01

    Bordering on the Fantastic. As the longest river on earth, the Nile passes through 10 countries. Presented through a wide range of activities and a winning array of games, it's also unsurpassed at taking young minds into exploring the world of water, as well as natural and man made wonders.

  7. Laboratory Alluvial Rivers

    Science.gov (United States)

    Devauchelle, O.; Abramian, A.; Seizilles, G.; Lajeunesse, E.

    2015-12-01

    By which physical mechanisms does a river select its shape and size? We investigate this question using small laboratory rivers formed by laminar flows.In its simplest form, this experiment consists in a flow of glycerol over a uniform layer of plastic sediments. After a few hours, a channel forms spontaneously, and eventually reaches a stable geometry. This equilibrium state corresponds accurately to the force balance proposed by Henderson (1961).If we impose a sediment discharge at the inlet of the experiment, the river adjusts to this boundary condition by widening its channel. Observation suggests that this new equilibrium results from the balance between gravity, which pulls the entrained grains towards the center of the channel, and bedload diffusion, which returns them towards the banks. This balance explains why experimental rivers get wider and shallower as their sediment load increases.However, to test quantitatively this theory against observation, we need to evaluate independently the effect of transverse slope on bedload transport. We propose to use an instability generated by bedload diffusion to do so.

  8. River Out of Edenl

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 2; Issue 11. River Out of Eden Darwin Goes Digital: Old View, New Metaphor. J A Santosh. Book Review Volume 2 Issue 11 November 1997 pp 104-106. Fulltext. Click here to view fulltext PDF. Permanent link:

  9. communities of rivers, nigeria

    African Journals Online (AJOL)

    daily by noise pollution and other health hazards. They drink from the very rivers and rivulets which have been polluted by petroleum extracts making development difficult. The sum total of all development objectives is to make life more meaningful and allow the people feel the impact of the “new dawn" of development.

  10. River Pollution: Part I.

    Science.gov (United States)

    Openshaw, Peter

    1983-01-01

    Describes a unit on river pollution and analytical methods to use in assessing temperature, pH, flow, calcium, chloride, dissolved oxygen, biochemical oxygen demand, dissolved nitrogen, detergents, heavy metals, sewage pollution, conductivity, and sediment cores. Suggests tests to be carried out and discusses significance of results. (JM)

  11. The Mtata River estuary

    African Journals Online (AJOL)

    1989-02-28

    Feb 28, 1989 ... A survey of the fish fauna of Transkei estuaries. Part Three: The Mtata River estuary. E.E. Plumstead* and J.F. Prinsloo. Department of Zoology, University of Transkei, Private Bag X1 001, Unitra, Umtata, Republic of Transkei. H.J. Schoonbee. Department of Zoology, Rand Afrikaans University, P.O. Box 524, ...

  12. The Hudson River estuary

    National Research Council Canada - National Science Library

    Levinton, J.S; Waldman, J.R

    2006-01-01

    ... emphasis on important issues specific to the Hudson, such as the effect of power plants and high concentrations of PCBs. The chapters are written by specialists at a level that is accessible to students, teachers, and the interested layperson. The Hudson River Estuary is a unique scientifi c biography of a major estuary, with relevance to the s...

  13. River water pollution condition in upper part of Brantas River and Bengawan Solo River

    Science.gov (United States)

    Roosmini, D.; Septiono, M. A.; Putri, N. E.; Shabrina, H. M.; Salami, I. R. S.; Ariesyady, H. D.

    2018-01-01

    Wastewater and solid waste from both domestic and industry have been known to give burden on river water quality. Most of river water quality problem in Indonesia has start in the upper part of river due to anthropogenic activities, due to inappropriate land use management including the poor wastewater infrastructure. Base on Upper Citarum River Water pollution problem, it is interesting to study the other main river in Java Island. Bengawan Solo River and Brantas River were chosen as the sample in this study. Parameters assessed in this study are as follows: TSS, TDS, pH, DO, and hexavalent chromium. The status of river water quality are assess using STORET method. Based on (five) parameters, STORET value showed that in Brantas River, Pagerluyung monitoring point had the worst quality relatively compared to other monitoring point in Brantas River with exceeding copper, lead and tin compared to the stream standard in East Java Provincial Regulation No. 2 in 2008. Brantas River was categorized as lightly polluted river based on monitoring period 2011-2015 in 5 monitoring points, namely Pendem, Sengguruh, Kademangan, Meritjan and Kertosono.

  14. Dynamic reorganization of river basins.

    Science.gov (United States)

    Willett, Sean D; McCoy, Scott W; Perron, J Taylor; Goren, Liran; Chen, Chia-Yu

    2014-03-07

    River networks evolve as migrating drainage divides reshape river basins and change network topology by capture of river channels. We demonstrate that a characteristic metric of river network geometry gauges the horizontal motion of drainage divides. Assessing this metric throughout a landscape maps the dynamic states of entire river networks, revealing diverse conditions: Drainage divides in the Loess Plateau of China appear stationary; the young topography of Taiwan has migrating divides driving adjustment of major basins; and rivers draining the ancient landscape of the southeastern United States are reorganizing in response to escarpment retreat and coastal advance. The ability to measure the dynamic reorganization of river basins presents opportunities to examine landscape-scale interactions among tectonics, erosion, and ecology.

  15. River-corridor habitat dynamics, Lower Missouri River

    Science.gov (United States)

    Jacobson, Robert B.

    2010-01-01

    Intensive management of the Missouri River for navigation, flood control, and power generation has resulted in substantial physical changes to the river corridor. Historically, the Missouri River was characterized by a shifting, multithread channel and abundant unvegetated sandbars. The shifting channel provided a wide variety of hydraulic environments and large areas of connected and unconnected off-channel water bodies.Beginning in the early 1800s and continuing to the present, the channel of the Lower Missouri River (downstream from Sioux City, Iowa) has been trained into a fast, deep, single-thread channel to stabilize banks and maintain commercial navigation. Wing dikes now concentrate the flow, and revetments and levees keep the channel in place and disconnect it from the flood plain. In addition, reservoir regulation of the Missouri River upstream of Yankton, South Dakota, has substantially changed the annual hydrograph, sediment loads, temperature regime, and nutrient budgets.While changes to the Missouri River have resulted in broad social and economic benefits, they have also been associated with loss of river-corridor habitats and diminished populations of native fish and wildlife species. Today, Missouri River stakeholders are seeking ways to restore some natural ecosystem benefits of the Lower Missouri River without compromising traditional economic uses of the river and flood plain.

  16. Paleo-environments, paleo-climates and sequences of Westphalian deposits of Lorraine coal basin (upper carboniferous, NE France); Paleoenvironnements, paleoclimats et sequences des depots westphaliens du Bassin houiller lorrain (carbonifere superieur, NE France)

    Energy Technology Data Exchange (ETDEWEB)

    Izart, A.; Fleck, St.; Michels, R. [Nancy Univ. Henri Poincare,UMR 7566, Geologie des Ressources Minerales et Energetiques, 54 -Vandoeuvre les Nancy (France); Palain, Ch.; Malartre, F. [Ecole Nationale Superieure de Geologie, UMR 7566, Geologie et Gestion des Ressources Minerales et Energetiques, 54 - Vandoeuvre les Nancy (France)

    2005-07-01

    Facies and sequences of the Westphalian C are identified in cores and well logs of three boreholes and three seismic lines supplied by Conoco-Phillips from the Lorraine coal Basin. The litho-facies associations suggest various paleo-environments and sequences during the Westphalian C. Decametric-thick sedimentary bodies display alluvial fan deposits in the northwestern border of the basin (Chaumont borehole). Decametric sedimentary bodies constituted either of conglomeratic and sandy facies with cylindrical shape in well logs represent braided river deposits, or alternations of fining and coarsening upward sequences with sandy, silty and clayey facies with bell and funnel shapes in well log correspond to meander river and lacustrine deltaic deposits in the Saulcy and Lorettes boreholes. Three fining upward third order sequences in the center of the basin in the Lorettes and Saulcy boreholes represent a period 1 with braided river deposits, a period 2 with flood plain, lake and meandering river deposits and a period 3 with anastomosed or meandering river deposits. Period 1 is correlated with a subsidence period in the basin and uplift of the borders, period 2 with the maximum fresh water flooding period with flood plain or lake deposits and period 3 with the filling period. The seismic profiles of Conoco-Phillips confirm the tectonic structures described by previous authors in Lorraine Basin. We agree that this basin was a strike-slip basin as demonstrated by previous authors with depocenters near the South Hunsruck and Metz faults from the Westphalian to the Permian. Bio-markers show that paleo-climate changes (wet/dry) of weak amplitude in the equatorial climate could also modify the sedimentation of this basin and act on sequences of second order. (authors)

  17. Late Dolomitization in Basinal Limestones of the Southern Apennines Fold and Thrust Belt (Italy Dolomitisation tardo-diagénétique dans les calcaires de bassins triassiques de l’Apennin Méridionale (Italie

    Directory of Open Access Journals (Sweden)

    Iannace A.

    2012-02-01

    major fluid-flux associated with fold and thrust belt development, which possibly affected the Apulian Platform carbonates located in the foreland. The latter, now buried below the nappe stack, hosts some of the major oil fields of continental Europe. Les carbonates pélagiques triassiques de l’Unité de Lagonegro, dans l’Apennin méridional hébergent des corps dolomitiques discordants. Ces dolomies montrent les structures typiques connues comme “zébra” ou dolomite “à selle”. Dans cette note, on présente les résultats d’observations de terrains et pétrographiques et les données géochimiques obtenues sur trois affleurements. Les données de terrain indiquent que les structures de type “zébra” et bréchifiées sont contrôlées par la stratification très régulière des calcaires micritiques. La dolomitisation a comporté le remplacement du calcaire et de la précipitation de dolomite cristalline dans les vides sous un champ de contraintes extensionnelles. Les températures d’homogénéisation sont comprises entre 80 et 120 °C, avec un mode à (95 ± 10 °C. Après une correction de pression, elles indiquent une température maximale de formation de la dolomie d’environ 110-115 °C. Les températures de fusion de la glace indiquent une salinité comprise entre 2 et 6 wt% NaCl eq, avec une moyenne de 4.2 %. Les valeurs de δ13C sont comparables à celles de l’eau de mer triassique, tandis que les valeurs de δ18O sont fortement appauvries. Les valeurs du rapport 87Sr/86Sr sont au contraire plus élevées que celles estimées pour l’eau de mer triassique, mais comparables à celles du Miocène Moyen-Supérieur. Ces résultats indiquent une dolomitisation accomplie par des fluides relativement chauds avec une salinité voisine de celle de la mer et une composition isotopique comprise entre celle de l’eau de mer et celle de saumures de bassin. On propose que cette dolomitisation a été achevée par les eaux expulsées par les formations

  18. Modèle de compaction élastoplastique et viscoplastique pour simulateur de bassins sédimentaires Elastoplastic and Viscoplastic Compaction Model for the Simulation of Sedimentary Basins

    Directory of Open Access Journals (Sweden)

    Schneider F.

    2006-11-01

    Full Text Available Cette étude complète un travail antérieur (Schneider, 1993 qui a permis d'interpréter et de formaliser le modèle de compaction classiquement utilisé dans des simulateurs comme Temispack (Doligez et al, 1986; Ungerer et al. , 1990. Le nouveau modèle présenté ici se distingue du précédent par l'introduction d'une composante viscoplastique dans l'équation qui décrit la compaction. L'ajout de cette composante permet de prendre en compte de façon macroscopique les phénomènes visqueux de la compaction comme la pression-dissolution. En utilisant des valeurs de coefficients de viscosité extrapolées à partir d'expériences de laboratoire, une étude de sensibilité montre que la déformation visqueuse est significative pour des bassins vieux de plus de 1 Ma. Certains tests montrent que le coefficient de viscosité peut être calibré simplement à partir de données de puits et d'expériences simples de laboratoire. À partir de données extraites de la littérature, il a été possible de calibrer un coefficient de viscosité de 2,5 GPa. Ma (= 8 x 10 puissance (22 Pa. s pour la craie. This article contains formulas (*** which can not be displayed on this screen. This study completes a previous work (Schneider, 1993 in which the compaction model that is conventionally used in models such as Temispack (Doligez et al. , 1986, Ungerer et al. , 1990, has been interpretated and formalized. The new model described here differs from the previous one by the introduction of a viscoplastic component in the formulation of the stress-strain relationships. The addition of this component, allows to take into account, at a macroscopical scale, viscous phenomena of compaction such as pressure solution. The volumetric rheology is then defined by the following system of equations:(***where phi is porosity; sigma is the effective stress defined as the difference between the overburden weight and the pore pressure; phi index (m is the maximum effective

  19. Geomorphology and River Management

    Directory of Open Access Journals (Sweden)

    GARY BRIERLEY

    2008-01-01

    Full Text Available Engineering-dominated practices, visible in a "command and control" outlook on natural systems, have induced enormous damage to the environment. Biodiversity losses and declining provision of ecosystem services are testimony to the non-sustainable outcomes brought about by such practices. More environmentally friendly approaches that promote a harmonious relationship between human activities and nature are required. Moves towards an "ecosystem approach" to environmental management require coherent (integrative scientific guidance. Geomorphology, the study of the form of the earth, provides a landscape template with which to ground this process. This way of thinking respects the inherent diversity and complexity of natural systems. Examples of the transition toward such views in environmental practice are demonstrated by the use of science to guide river management, emphasising applications of the River Styles framework.

  20. Re: Soviet river diversions

    Science.gov (United States)

    Robertson, Jas O.

    The paper on ‘Soviet River Diversions’ by Phil Micklin (Eos, 62(19), May 12, 1981) has just come to hand.Referring to the map on page 489, I was interested to see the estimates of river flows for the Amu and Syr Darya, which clearly show the effect of irrigation on inflows to the Aral Sea. Recently, I was passing over the northeast corner of the sea on a flight from Tashkent to Moscow when I got the impression that increasing irrigation development on the Syr Darya is likely to decrease the annual inflow even more than in the recent past. The same state of affairs has been going on in the Caspian Sea for years, as a result of irrigation development on the Volga. My impression was that the Aral Sea had shrunk considerably from the 26,000 odd square miles (67,304 km2) area quoted (from memory) in Encyclopaedia Britannica (edition circa 1970).

  1. The river research programme

    CSIR Research Space (South Africa)

    Ferrar, AA

    1988-01-01

    Full Text Available reference to the ecological needs of aquatic ecosystems. No acknowledgement of any social or economic cost for the degradation of aquatic ecosystems as a result of water abstraction is made in the Commission's report except for certain nature reserves... for water means that all our substantial river systems will be subject to water regulation and abstraction and to the introduction of pollutants. Conservation management therefore becomes an exercise in mitigation. The principal tools are, legislation...

  2. Petrophysical Properties of the Middle Jurassic Carbonates in the PICOREF Sector (South Champagne, Paris Basin, France Propriétés pétrophysiques du Dogger carbonaté dans le Secteur PICOREF (Sud Champagne, bassin de Paris, France

    Directory of Open Access Journals (Sweden)

    Delmas J.

    2010-05-01

    Full Text Available This article, carried out as part of the PICOREF Project for the CO2 storage in the aquifers of the Paris Basin, presents an important petrophysical database from the numerous petroleum wells drilled in the PICOREF Sector (south-eastern part of the Paris Basin between 1953 and 2001. These core data concern the three saline carbonated aquifers of the Middle Jurassic: the Oolithe Blanche and the Comblanchien formations, Upper Bathonian age, and the Dalle Nacrée formation, Lower Callovian age, that would be used for the CO2 sequestration. Located at –1230 to –1750 m sub sea in the studied sector, these carbonate reservoirs which cumulative thickness is about 150 m, outcrop in the Burgundy region, at about 80 km south-eastern the Sector where they are exploited in several quarries. The analysis of the 6800 routine measurements (porosity and permeability gathered for this study allowed to improve the knowledge of the petrophysical properties. Special measurements (mercury injection tests allowed to characterize the porous medium. Cet article, réalisé dans le cadre du Projet PICOREF(1 pour le stockage de CO2 dans les aquifères du bassin parisien, présente une importante base de données pétrophysiques issues des nombreux puits pétroliers forés dans le Secteur PICOREF (sud-est du bassin parisien entre 1953 et 2001. Ces données concernent les trois aquifères salins du Dogger carbonaté susceptibles d’être utilisés pour séquestrer du CO2 : l’Oolithe Blanche et le Comblanchien, d’âge Bathonien supérieur, ainsi que la Dalle Nacrée d’âge Callovien inférieur. Recoupés à des altitudes de – 1230 à – 1750 m/mer dans le secteur étudié, ces réservoirs carbonatés, dont l’épaisseur cumulée est de 150 m environ, affleurent en Bourgogne, à 80 km au sud-est du « Secteur », où ils sont exploités dans plusieurs carrières. L’analyse des 6800 mesures classiques (porosité et perméabilité rassemblées ici a permis d

  3. Rehabilitating China's largest inland river.

    Science.gov (United States)

    Li, Yiqing; Chen, Yaning; Zhang, Yaoqi; Xia, Yang

    2009-06-01

    Wetlands are particularly important for conserving China's biodiversity but riparian wetlands in the Tarim River basin in western China have been reduced by 46% during the last 3 decades. The world's largest habitat for Populus euphratica, which is in the Tarim River basin, significantly shrank. To protect and restore the deteriorated ecosystems along the Tarim River and its associated wetlands, China's government initiated a multimillion dollar river restoration project to release water from upper dams to the dried-up lower reaches of the Tarim River starting in 2000. We monitored the responses of groundwater and vegetation to water recharge in the lower reaches of the river from 2000 to 2006 by establishing nine 1000-m-long transects perpendicular to the river at intervals of 20-45 km along the 320-km river course below the Daxihaizi Reservoir, the source of water conveyance, to Lake Taitema, the terminus of the Tarim River. Water recharges from the Daxihaizi Reservoir to the lower reaches of the Tarim River significantly increased groundwater levels and vegetation coverage at all monitoring sites along the river. The mean canopy size of the endangered plant species P. euphratica doubled after 6 years of water recharge. Some rare migrating birds returned to rest on the restored wetlands in summer along the lower reaches of the Tarim River. The biggest challenge facing decision makers, however, is to balance water allocation and water rights between agricultural and natural ecosystems in a sustainable way. A large number of inhabitants in the Tarim Basin depend on these limited water resources for a living. At the same time, the endangered ecosystems need to be protected. Given the ecological, socioeconomic, and sociopolitical realities in the Tarim Basin, adaptive water policies and strategies are needed for water allocation in these areas of limited water resources. ©2009 Society for Conservation Biology.

  4. Natural transformation in river epilithon.

    OpenAIRE

    Williams, H. G.; Day, M.J.; Fry, J. C.; Stewart, G. J.

    1996-01-01

    Natural transformation was demonstrated in unenclosed experiments incubated in river epilithon. Strains of Acinetobacter calcoaceticus were transformed to prototrophy by either free DNA (lysates) or live donor cells. The sources of transforming DNA and recipient culture were immobilized on filters, secured to stones, and incubated midstream in the river. The transfer frequency generally increased with temperature. No transfer was detected in the river Taff below 10 degrees C. The age of the r...

  5. Climate Change | Page 15 | IDRC - International Development ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Read more about Impact of Climate Variability on the Coastal Areas of Argentina and Uruguay in the River Plate Estuary. Language English. Read more about Adaptation aux changements climatiques grâce à une gestion améliorée des bassins versants dans le bassin du Tensift, au Maroc. Language French. Read more ...

  6. ENGINEER SUPPORT OF RIVER CROSSINGS,

    Science.gov (United States)

    The author discusses the basic missions of engineer support in forcing rivers from a drive, following planned preparations, and under special...conditions. Practical recommendations are made with respect to organizing engineer support in forcing rivers and the characteristics of crossing means is described. (Author)

  7. Niagara River Toxics Management Plan

    Science.gov (United States)

    This 2007 Progress Report of the Niagara River Toxics Management Plan (NRTMP) summarizes progress made by the four parties in dealing with the 18 “Priority Toxics” through reductions in point and non-point sources to the Niagara River.

  8. Morphodynamics: Rivers beyond steady state

    National Research Council Canada - National Science Library

    Church, M; Ferguson, R. I

    2015-01-01

    .... River morphodynamics—an expression of bed material erosion, transport, and deposition—is the study of these interactions, the outcome of which is river morphology, hence it is appropriate to consider together advances in understanding bed material transport and morphodynamics. Over the past half century, Water Resources Research has been a significan...

  9. Geomorphology and River Dynamics of the Lower Copper River, Alaska

    Science.gov (United States)

    Brabets, Timothy P.; Conaway, Jeffrey S.

    2009-01-01

    Located in south-central Alaska, the Copper River drains an area of more than 24,000 square miles. The average annual flow of the river near its mouth is 63,600 cubic feet per second, but is highly variable between winter and summer. In the winter, flow averages approximately 11,700 cubic feet per second, and in the summer, due to snowmelt, rainfall, and glacial melt, flow averages approximately 113,000 cubic feet per second, an order of magnitude higher. About 15 miles upstream of its mouth, the Copper River flows past the face of Childs Glacier and enters a large, broad, delta. The Copper River Highway traverses this flood plain, and in 2008, 11 bridges were located along this section of the highway. The bridges cross several parts of the Copper River and in recent years, the changing course of the river has seriously damaged some of the bridges. Analysis of aerial photography from 1991, 1996, 2002, 2006, and 2007 indicates the eastward migration of a channel of the Copper River that has resulted in damage to the Copper River Highway near Mile 43.5. Migration of another channel in the flood plain has resulted in damage to the approach of Bridge 339. As a verification of channel change, flow measurements were made at bridges along the Copper River Highway in 2005-07. Analysis of the flow measurements indicate that the total flow of the Copper River has shifted from approximately 50 percent passing through the bridges at Mile 27, near the western edge of the flood plain, and 50 percent passing through the bridges at Mile 36-37 to approximately 5 percent passing through the bridges at Mile 27 and 95 percent through the bridges at Mile 36-37 during average flow periods. The U.S. Geological Survey's Multi-Dimensional Surface-Water Modeling System was used to simulate water-surface elevation and velocity, and to compute bed shear stress at two areas where the Copper River is affecting the Copper River Highway. After calibration, the model was used to examine the

  10. Hood River Passive House

    Energy Technology Data Exchange (ETDEWEB)

    Hales, David [BA-PIRC, Spokane, WA (United States)

    2014-01-01

    The Hood River Passive Project was developed by Root Design Build of Hood River Oregon using the Passive House Planning Package (PHPP) to meet all of the requirements for certification under the European Passive House standards. The Passive House design approach has been gaining momentum among residential designers for custom homes and BEopt modeling indicates that these designs may actually exceed the goal of the U.S. Department of Energy's (DOE) Building America program to "reduce home energy use by 30%-50% (compared to 2009 energy codes for new homes). This report documents the short term test results of the Shift House and compares the results of PHPP and BEopt modeling of the project. The design includes high R-Value assemblies, extremely tight construction, high performance doors and windows, solar thermal DHW, heat recovery ventilation, moveable external shutters and a high performance ductless mini-split heat pump. Cost analysis indicates that many of the measures implemented in this project did not meet the BA standard for cost neutrality. The ductless mini-split heat pump, lighting and advanced air leakage control were the most cost effective measures. The future challenge will be to value engineer the performance levels indicated here in modeling using production based practices at a significantly lower cost.

  11. Hood River Passive House

    Energy Technology Data Exchange (ETDEWEB)

    Hales, David [National Renewable Energy Lab. (NREL), Golden, CO (United States)

    2014-01-01

    The Hood River Passive Project was developed by Root Design Build of Hood River Oregon using the Passive House Planning Package (PHPP) to meet all of the requirements for certification under the European Passive House standards. The Passive House design approach has been gaining momentum among residential designers for custom homes and BEopt modeling indicates that these designs may actually exceed the goal of the U.S. Department of Energy's (DOE) Building America program to reduce home energy use by 30%-50% (compared to 2009 energy codes for new homes). This report documents the short term test results of the Shift House and compares the results of PHPP and BEopt modeling of the project. The design includes high R-Value assemblies, extremely tight construction, high performance doors and windows, solar thermal DHW, heat recovery ventilation, moveable external shutters and a high performance ductless mini-split heat pump. Cost analysis indicates that many of the measures implemented in this project did not meet the BA standard for cost neutrality. The ductless mini-split heat pump, lighting and advanced air leakage control were the most cost effective measures. The future challenge will be to value engineer the performance levels indicated here in modeling using production based practices at a significantly lower cost.

  12. River-Based Experiential Learning: the Bear River Fellows Program

    Science.gov (United States)

    Rosenberg, D. E.; Shirley, B.; Roark, M. F.

    2012-12-01

    The Department of Civil and Environmental Engineering, Outdoor Recreation, and Parks and Recreation programs at Utah State University (USU) have partnered to offer a new, unique river-based experiential learning opportunity for undergraduates called the Bear River Fellows Program. The program allows incoming freshmen Fellows to experience a river first hand during a 5-day/4-night river trip on the nearby Bear River two weeks before the start of their first Fall semester. As part of the program, Fellows will navigate the Bear River in canoes, camp along the banks, interact with local water and environmental managers, collect channel cross section, stream flow, vegetation cover, and topological complexity data, meet other incoming freshmen, interact with faculty and graduate students, develop boating and leadership skills, problem solve, and participate as full members of the trip team. Subsequently, Fellows will get paid as undergraduate researchers during their Fall and Spring Freshman semesters to analyze, synthesize, and present the field data they collect. The program is a collaborative effort between two USU academic units and the (non-academic) division of Student Services and supports a larger National Science Foundation funded environmental modelling and management project for the lower Bear River, Utah watershed. We have advertised the program via Facebook and emails to incoming USU freshmen, received 35 applications (60% women), and accepted 5 Fellows into the program (3 female and 2 male). The river trip departs August 14, 2012. The poster will overview the Bear River Fellows Program and present qualitative and preliminary outcomes emerging from the trip and Fellows' work through the Fall semester with the field data they collect. We will also undertake more rigorous and longer longitudinal quantitative evaluation of Program outcomes (for example, in problem-solving and leadership) both in Spring 2013 and in subsequent 2013 and 2014 offerings of the

  13. PCBs in the Harlem River

    Science.gov (United States)

    Wang, J.

    2012-12-01

    Polychlorinated biphenyls (PCBs) are persistent, toxic and bioaccumulated contaminants of great environmental concern. PCB is a tracer of wastewater, stormwater and CSOs inputs; PCBs contamination of fish is a main environmental concern for the Harlem River. PCBs in the Harlem River are from combined sewer overflows (CSOs), stormwater runoff, wastewater, as well as upper Hudson GE (General Electric at Fort Edward)'s release. PCBs affect human health mostly from contaminated fish consumption. Many research focused on PCBs in the Hudson River and New York/New Jersey Harbor. However, PCBs source, transport and environmental impact in the Harlem River-a natural straight that connects the Hudson River and the East River, had not been well studied. In this research, water sample were collected from the Harlem River and analyzed PCBs by HR GC/MS (High resolution gas chromatography mass spectrophotometer). Preliminary results showed that certain PCBs congeners in the water column. Results also indicated that nutrients (phosphorus and ammonia) as well as bacteria levels exceeded EPA standards: Total phosphorus-10μg/L, total nitrogen-0.38mg/L; E.Coli-126 MPN/100ml, Enterococcus- 104MPN/100ml, Fecal Coliform-200 MPN/100ml. This research is under process, and more results could give further detail in near future. This research will help improve water quality of the Harlem River, improve environmental health and raise environmental awareness.SO tank Nutrient and bacterial levels of selected sites in the Harlem RiverCSO: Combined Sewer OverflowWWTP: Waste Water Treatment Plant

  14. 29 CFR 1917.126 - River banks.

    Science.gov (United States)

    2010-07-01

    ... 29 Labor 7 2010-07-01 2010-07-01 false River banks. 1917.126 Section 1917.126 Labor Regulations...) MARINE TERMINALS Terminal Facilities § 1917.126 River banks. (a) This section applies to temporary installations or temporary operations near a river bank. (b) Where working surfaces at river banks slope so...

  15. Clinch River project: Sediment contaminants in the Lower Clinch River

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Sediment samples from three mainstem and seven tributary sites in the Clinch River Basin were analyzed for 21 organochlorine compounds, 19 metals, total volatile...

  16. A Review of Integrated River Basin Management for Sarawak River

    OpenAIRE

    Kuok K. Kuok; Sobri Harun; Po-Chan Chiu

    2011-01-01

    Problem statement: Sarawak River was a life-sustaining water source for the residents in Kuching City and surrounding areas. Raw water is treated at Batu Kitang Water Treatment Plant (BKWTP) that supplies more than 98% of the total water production in Kuching City. The raw water supply to BKWTP is not adequate to meet the ever increasing water demand. In order to overcome this problem, four projects had been implemented along Sarawak River for managing and securing water&#...

  17. Hydrological River Drought Analysis (Case Study: Lake Urmia Basin Rivers

    Directory of Open Access Journals (Sweden)

    Mohammad Nazeri Tahrudi

    2017-02-01

    Full Text Available Introduction: Drought from the hydrological viewpoint is a continuation of the meteorological drought that cause of the lack of surface water such as rivers, lakes, reservoirs and groundwater resources. This analysis, which is generally on the surface streams, reservoirs, lakes and groundwater, takes place as hydrological drought considered and studied. So the data on the quantity of flow of the rivers in this study is of fundamental importance. This data are included, level, flow, river flow is no term (5. Overall the hydrological drought studies are focused on annual discharges, maximum annual discharge or minimum discharge period. The most importance of this analysis is periodically during the course of the analysis remains a certain threshold and subthresholdrunoff volume fraction has created. In situations where water for irrigation or water of a river without any reservoir, is not adequate, the minimum flow analysis, the most important factor to be considered (4. The aim of this study is evaluatingthe statistical distributions of drought volume rivers data from the Urmia Lake’s rivers and its return period. Materials and Methods: Urmia Lake is a biggest and saltiest continued lake in Iran. The Lake Urmia basin is one of the most important basins in Iran region which is located in the North West of Iran. With an extent of 52700 square kilometers and an area equivalent to 3.21% of the total area of the country, This basin is located between the circuit of 35 degrees 40 minutes to 38 degrees 29 minutes north latitude and the meridian of 44 degrees 13 minutes to 47 degrees 53 minutes east longitude. In this study used the daily discharge data (m3s-1 of Urmia Lake Rivers. Extraction of river drought volume The drought durations were extracted from the daily discharge of 13 studied stations. The first mean year was calculated for each 365 days using the Eq 1 (14. (1 (For i=1,2,3,…,365 That Ki is aith mean year, Yijis ith day discharge in jth

  18. Organic Matter in the Early Toarcian Shales, Paris Basin, France: a Response to Environmental Changes La matière organique dans les argiles du Toarcien inférieur du bassin de Paris, France : un enregistrement des changements d'environnement

    Directory of Open Access Journals (Sweden)

    Hollander D. J.

    2006-11-01

    éogéographique dans lequel s'est fait le dépôt des black shales du Toarcien inférieur en Europe du Nord semble relativement bien établi - des bassins individualisés à l'intérieur des mers épicontinentales adjacentes à la marge de la Téthys -, l'environnement de dépôt à l'origine de l'accumulation de ces black shales reste controversé et a fait l'objet de nombreux modèles. La présente étude, menée sur une carotte prélevée dans les Schistes Carton du Bassin de Paris, apporte sa contribution à la détermination de leur environnement de dépôt, en intégrant les aspects géochimiques, pétrologiques, isotopiques et moléculaires. Tout au long de la section de 16 m étudiée, qui couvre la zone à falciferum et la zone à bifrons pro parte, et dont la matière organique est encore au stade immature (Tmax autour de 430, les caractéristiques moléculaires et pétrographiques restent remarquablement uniformes : les chromatogrammes des hydrocarbures saturés sont dominés par des n-alcanes de C15 à C18, présentent une quantité significative d'isoprénoïdes, un rapport Pr/Ph systématiquement supérieur à 1 et une contribution importante d'hydrocarbures polycycliques (hopanes, stéranes et méthylstéranes. Les argiles sont laminées, sans traces de bioturbation; des framboïdes de pyrite sont présents dans toute la série; seule variation, les concrétions dolomitiques et calcitiques riches en Mg et les horizons carbonatés plus abondants dans la partie inférieure de la série. La matière organique figurée, de composition quasiment constante, est formée essentiellement d'algues avec une contribution mineure en débris de plantes terrestres. Tous ces résultats attestent de l'origine marine de la matière organique (algaire et bactérienne, la matière organique d'origine terrestre n'intervenant que de manière secondaire. Ils impliquent par ailleurs, que l'environnement à l'interface eau/sédiments est resté anoxique et calme durant le dépôt de la s

  19. Spatial variability of caesium-137 activities in soils in the Jura mountains; Variabilite spatiale des activites en cesium-137 dans les sols d'un bassin versant du massif du Jura: etendue et principales sources de variation

    Energy Technology Data Exchange (ETDEWEB)

    Pimou-Heumou, G.; Lucot, E.; Crini, N.; Briot, M.; Badot, P.M. [CNRS - Universite de Franche-Comte, Laboratoire chrono-environnement, UMR 6249, Place Leclerc, 25030 Besancon Cedex (France)

    2011-01-15

    275 soil samples were taken in the catchment area of the upper part of the Doubs river located in the Jura mountains according to a sampling strategy designed to evaluate the extent of the spatial variability of {sup 137}Cs activities and to identify its main sources. {sup 137}Cs activities ranged between about 1000 and 12000 Bq.m{sup -2} with an average of approximately 3600 Bq.m{sup -2}. The spatial variability of the contamination is high: {sup 137}Cs activity shows statistically significant links with altitude, soil organic matter and land cover, whereas the other studied parameters, i.e. soil type and topographic position, do not constitute significant sources of variation. These results are discussed in terms of evaluation of the radioactive contamination on a regional scale. They show that to be satisfactory, a sampling strategy must necessarily take into account the various types of land cover. (authors)

  20. Haw River sediment quality assessment

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This report documents an evaluation of chemical contaminants in, and toxicity of, sediments collected from impoundments created by dams on the Haw River in Alamance...

  1. Umpqua River Oregon Geologic Floodplain

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Umpqua River drains 12,103 square kilometers (4,673 square miles) in southwest Oregon before flowing into the Pacific Ocean at Winchester Bay near the city of...

  2. Riparian Habitat - San Joaquin River

    Data.gov (United States)

    California Department of Resources — The immediate focus of this study is to identify, describe and map the extent and diversity of riparian habitats found along the main stem of the San Joaquin River,...

  3. Arkansas River Water Needs Assessment

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This report is on the legal elements, hydrologic analysis, objectives, and water levels related to the Arkansas River and the management of it.

  4. Braden River - Aerial Topographic Mapping

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This metadata record describes the ortho & LIDAR mapping of the Braden River area, FL. The mapping consists of LIDAR data collection, contour generation, and...

  5. Humboldt River main stem, Nevada

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set contains the main stem of the Humboldt River as defined by Humboldt Project personnel of the U.S. Geological Survey Nevada District, 2001. The data set...

  6. Togiak River sportfishing studies, 1984

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Nearly three thousand angler days of effort was estimated to have been spent on the Togiak River in 1984. Effort was clearly dominated by the professional guiding...

  7. Upper Yukon River, Alaska, a wild and scenic river analysis: Preliminary draft: Chapters IV and V

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The Upper Yukon River, Alaska, possesses values which qualify it for inclusion in the National Wild and Scenic Rivers System. The Upper Yukon River and its immediate...

  8. Sensitivity of Coastal Environments and Wildlife to Spilled Oil: Hudson River: RVRMILES (River Mile Marker Lines)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set contains human-use resource data for river miles along the Hudson River. Vector lines in this data set represent river mile markers. This data set...

  9. The Cretaceous Source Rocks in the Zagros Foothills of Iran Les roches mères Crétacé de l'avant-pays du Zagros en Iran : un exemple de bassin intracratonique de grande dimension

    Directory of Open Access Journals (Sweden)

    Bordenave M. L.

    2006-11-01

    d'un bassin intracratonique peu profond en communication avec la Téthys. Ces dépressions ont acquis un caractère anoxique en réponse à une stratification des eaux favorisée par un haut niveau marin, un climat humide et l'existence d'un seuil séparant cette région de l'océan ouvert. En revanche, les roches mères des formations Gadvan et Gurpi se sont déposées dans des dépressions faiblement ébauchées où les conditions dysaérobiques ont pu s'établir. Ces roches mères ont des extensions limitées au sud-est du Khuzistan et au nord-ouest du Fars pour la formation Gadvan et au couloir étroit d'orientation nord-est s'étendant du Luristan au nord du Fars pour la formation Gurpi. Dans ces zones d'existence, les roches mères des formations Gadvan et Gurpi ont des potentiels pétroliers plus modestes avec des teneurs en carbone organique de l'ordre de 1 à 2 % et des Index d'Hydrogène compris entre 150 et 400 mg HC/g C. La contribution de ces différentes roches mères est extrêmement variable. Au Luristan, la roche mère Garau bien que présentant un fort potentiel est rarement associée avec des pièges efficaces : la formation Garau est associée le plus souvent à un faciès plus profond et argileux, peu perméable, du Bangestan : le faciès à Oligostigena . D'autre part, l'excellent réservoir de la formation Asmari est érodé dans le coeur des structures par suite du soulèvement du Luristan au Pliocène. En conséquence, seuls des petits champs associés à la roche mère Garau, situés dans la partie sud-est du Luristan se sont accumulés dans les formations Sarvak et Ilam quand ceux-ci correspondent à des faciès de haute énergie. Dans les parties centrales et méridionales du Dezful Embayment , la roche mère Kazhdumi, qui présente un fort potentiel et une maturité thermique adéquate, est associée à d'excellents réservoirs, à de très larges structures et à une couverture efficace de la formation Gachsaran et forme un système p

  10. Geopressure and Trap Integrity Predictions from 3-D Seismic Data: Case Study of the Greater Ughelli Depobelt, Niger Delta Pressions de pores et prévisions de l’intégrité des couvertures à partir de données sismiques 3D : le cas du grand sous-bassin d’Ughelli, Delta du Niger

    Directory of Open Access Journals (Sweden)

    Opara A.I.

    2012-05-01

    Full Text Available The deep drilling campaign in the Niger Delta has demonstrated the need for a detailed geopressure and trap integrity (drilling margin analysis as an integral and required step in prospect appraisal. Pre-drill pore pressure prediction from 3-D seismic data was carried out in the Greater Ughelli depobelt, Niger Delta basin to predict subsurface pressure regimes and further applied in the determination of hydrocarbon column height, reservoir continuity, fault seal and trap integrity. Results revealed that geopressured sedimentary formations are common within the more prolific deeper hydrocarbon reserves in the Niger Delta basin. The depth to top of mild geopressure (0.60 psi/ft ranges from about 10 000 ftss to over 30 000 ftss. The distribution of geopressures shows a well defined trend with depth to top of geopressures increasing towards the central part of the basin. This variation in the depth of top of geopressures in the area is believed to be related to faulting and shale diapirism, with top of geopressures becoming shallow with shale diapirism and deep with sedimentation. Post-depositional faulting is believed to have controlled the configuration of the geopressure surface and has played later roles in modifying the present day depth to top of geopressures. In general, geopressure in this area is often associated with simple rollover structures bounded by growth faults, especially at the hanging walls, while hydrostatic pressures were observed in areas with k-faults and collapsed crested structures. Les campagnes de forages profonds dans le delta du Niger ont démontré la nécessité d’une analyse détaillée des surpressions et de l’intégrité des structures pour évaluer correctement les prospects. La prédiction des pressions interstitielles a pu être réalisée ici avant forage à partir de données sismiques 3-D du grand sous-bassin d’Ughelli, dans le delta du Niger. Ce travail a permis de prévoir les régimes de pression du

  11. Valley evolution by meandering rivers

    Science.gov (United States)

    Limaye, Ajay Brian Sanjay

    Fluvial systems form landscapes and sedimentary deposits with a rich hierarchy of structures that extend from grain- to valley scale. Large-scale pattern formation in fluvial systems is commonly attributed to forcing by external factors, including climate change, tectonic uplift, and sea-level change. Yet over geologic timescales, rivers may also develop large-scale erosional and depositional patterns that do not bear on environmental history. This dissertation uses a combination of numerical modeling and topographic analysis to identify and quantify patterns in river valleys that form as a consequence of river meandering alone, under constant external forcing. Chapter 2 identifies a numerical artifact in existing, grid-based models that represent the co-evolution of river channel migration and bank strength over geologic timescales. A new, vector-based technique for bank-material tracking is shown to improve predictions for the evolution of meander belts, floodplains, sedimentary deposits formed by aggrading channels, and bedrock river valleys, particularly when spatial contrasts in bank strength are strong. Chapters 3 and 4 apply this numerical technique to establishing valley topography formed by a vertically incising, meandering river subject to constant external forcing---which should serve as the null hypothesis for valley evolution. In Chapter 3, this scenario is shown to explain a variety of common bedrock river valley types and smaller-scale features within them---including entrenched channels, long-wavelength, arcuate scars in valley walls, and bedrock-cored river terraces. Chapter 4 describes the age and geometric statistics of river terraces formed by meandering with constant external forcing, and compares them to terraces in natural river valleys. The frequency of intrinsic terrace formation by meandering is shown to reflect a characteristic relief-generation timescale, and terrace length is identified as a key criterion for distinguishing these

  12. Comparison of two methods for estimating the abundance, diversity and habitat preference of fluvial macroinvertebrates in contrasting habitats

    NARCIS (Netherlands)

    Alonso, A.; Camargo, J.A.

    2010-01-01

    In this research we evaluate the effects of the method used for estimating the potential surface available for benthic macroinvertebrates in macrophyte and unvegetated habitats on several metrics and habitat preference of aquatic macroinvertebrates in the upper catchment of the Henares River

  13. Simulation of regional-scale groundwater flow in the Azul River basin, Buenos Aires Province, Argentina

    Science.gov (United States)

    Varni, Marcelo R.; Usunoff, Eduardo J.

    A three-dimensional modular model (MODFLOW) was used to simulate groundwater flow in the Azul River basin, Buenos Aires Province, Argentina, in order to assess the correctness of the conceptual model of the hydrogeological system. Simulated heads satisfactorily match observed heads in the regional water-table aquifer. Model results indicate that: (1) groundwater recharge is not uniform throughout the region but is best represented by three recharge rates, decreasing downgradient, similar to the distribution of soils and geomorphological characteristics; and (2) evapotranspiration rates are larger than previous estimates, which were made by using the Thornthwaite-Mather method. Evapotranspiration rates estimated by MODFLOW agree with results of independent studies of the region. Model results closely match historical surface-flow records, thereby suggesting that the model description of the aquifer-river relationship is correct. Résumé Un modèle modulaire tridimensionnel (MODFLOW) a été utilisé pour simuler les écoulements souterrains dans le bassin de la rivière Azul (Province de Buenos Aires, Argentine), dans le but d'évaluer la justesse du modèle conceptuel du système hydrogéologique. La piézométrie simulée s'ajuste de façon satisfaisante à celle observée pour l'ensemble de la nappe. Les résultats du modèle indiquent que: (1) la recharge de la nappe n'est pas uniforme sur toute la région, mais qu'elle est mieux approchée par trois valeurs différentes, décroissant vers l'aval-gradient, en suivant la même distribution que les sols et les caractéristiques géomorphologiques et (2) l'évapotranspiration est nettement plus importante que prévu initialement à partir de la méthode de Thornthwaite-Mather. Les valeurs d'évapotranspiration fournies par MODFLOW concordent bien avec les résultats d'autres études portant sur la région. Les résultats du modèle reproduisent convenablement les chroniques de débit des écoulements de surface

  14. Observations préliminaires sur la répartition et les fluctuations de l'ichtyomasse exploitable dans les différentes zones écologiques du lac Ihema (bassin moyen de l'Akagera, Rwanda

    Directory of Open Access Journals (Sweden)

    Mughanda, M.

    1988-01-01

    Full Text Available Preliminary considerations on distribution and changes in fishable ichtyomass in the ecological areas of lake Ihema (Akagera middle, Foodplain, Rwanda. Since 1981, commercial fishing is accomplished in lake Ihema with gillnets of 50 mm meshes and a mean of 175 tons of fish was caught per year during the first three years. Simultaneously, experimental fishing was introduced since 1982, for which ten gillnets of different meshes are used. Fishes of the two general Tilapia and Clarias are captured in commercial fishing, but in experimental one, about ten taxons of fish are caught. For this paper, we examined statistics obtained from experimental catches during 1982 and 1983. Apart from Tilapia and Clarias, small Cichlidae of Haplochromis group, two species of Mormyridae and Synodontis spp represent a potential which may be exploited with other kinds of gear. Concerning productiveness of fishing areas in lake Ihema, littoral zones (= inshore are more rich than pelagic (= offshore ones and the northern sector in which Akagera river enters the lake is the most productive. Species of fish are differently represented in ecological zones, following the kind of their food (planctonophagous, detritivorous or carnivorous and the places they can reproduce. Catches fluctuate monthly and annually probably because of natural changes in fish stock according to fluctuations of climatic conditions, but also because of increasing intensity of commercial fishing. For Tilapia, reduction in the quantity captured may also be due to introgressive hybridization and competition between T. macrochir, T. nilotica and their hybrids.

  15. Caractérisation d'une modification éventuelle de la relation pluie-débit en Afrique de l'Ouest : cas du bassin versant du N'zi (Bandama en Côte d'Ivoire, Thèse de Doctorat, Université de Cocody-Abidjan, Côte d'Ivoire, 210 p.

    Directory of Open Access Journals (Sweden)

    Amani Michel Kouassi

    2010-04-01

    Full Text Available De nombreuses études sur la variabilité climatique à l'échelle de l'Afrique de l'Ouest et de la Côte d'Ivoire, montrent qu'une tendance à la sécheresse s'est manifestée à partir de la fin de la décennie 1960. Ces anomalies pluviométriques observées sur plusieurs années consécutives se sont répercutées sur les écoulements des cours d'eau provoquant une baisse considérable de leurs caractéristiques hydrologiques (débits moyens annuels, débits moyens journaliers maximums, débits d'étiage, etc.. À côté de la variabilité hydroclimatique, il y a la dégradation du couvert végétal. Plusieurs travaux réalisés sont souvent orientés vers la caractérisation de la variabilité hydroclimatique et la prévision des ressources en eau. La présente thèse tente de répondre à une question qui nous semble essentielle : quelle est la dynamique de la transformation de la pluie en débit à l'échelle du bassin versant aux pas mensuel et annuel, par des modèles hydrologiques, dans un contexte de variabilité hydroclimatique et de modification de l'occupation du sol ? Et quelles sont les conséquences de cette dynamique pluie-débit sur les ressources en eau ?L'objectif de ce travail est d'identifier des tendances au sein de la relation pluie-débit et d'étudier ses impacts sur les ressources en eau du bassin versant du N'zi (Bandama dans un contexte de variabilité hydroclimatique et de modification de l'occupation du sol. Les résultats des différentes méthodes statistiques appliquées aux séries chronologiques de variables caractéristiques du régime pluviométrique et hydrométrique montrent que globalement sur le bassin versant du N'zi (Bandama, ces variables sont en baisse depuis les années 1970. Le déficit pluviométrique annuel varie entre 13 % et 24 %, alors que les débits moyens annuels des cours d'eau de surface présentent un déficit moyen de 52 %. Cependant, cette variabilité climatique n'a pas engendr

  16. Grays River Watershed Geomorphic Analysis

    Energy Technology Data Exchange (ETDEWEB)

    Geist, David R

    2005-04-30

    This investigation, completed for the Pacific Northwest National Laboratory (PNNL), is part of the Grays River Watershed and Biological Assessment commissioned by Bonneville Power Administration under project number 2003-013-00 to assess impacts on salmon habitat in the upper Grays River watershed and present recommendations for habitat improvement. This report presents the findings of the geomorphic assessment and is intended to support the overall PNNL project by evaluating the following: The effects of historical and current land use practices on erosion and sedimentation within the channel network The ways in which these effects have influenced the sediment budget of the upper watershed The resulting responses in the main stem Grays River upstream of State Highway 4 The past and future implications for salmon habitat.

  17. Physical - Elwha River Dam Removal Study

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This study examines the ecosystem response of the Elwha River to the removal of the Elwha River dams. We will measure the following attributes of ecosystem response:...

  18. Habitat Analysis - Trinity River Restoration Potential

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The goal of the Trinity River project is to identify the potential positive effects of large-scale restoration actions in a 63 kilometer reach of the Trinity River...

  19. Geomorphic Analysis - Trinity River Restoration Potential

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The goal of the Trinity River project is to identify the potential positive effects of large-scale restoration actions in a 63 kilometer reach of the Trinity River...

  20. Colorado River Mile System, Tenths of Miles

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This coverage contains points representing tenth of miles in the GCMRC river mile system. The points fall along the centerline of the Colorado River from Glen Canyon...

  1. Sprague River Oregon Centerline Sycan 2000

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  2. Sprague River Oregon Centerline North Fork 2000

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  3. 2010 Hudson River Shallow Water Sediment Cores

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Hudson River Shallow Water Mapping project characterizes the bottom of the Hudson River Estuary in shallow water (<3 m). The characterization includes...

  4. 2010 Hudson River Shallow Water Sediment Grabs

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Hudson River Shallow Water Mapping project characterizes the bottom of the Hudson River Estuary in shallow water (<3 m). The characterization includes...

  5. Global Lake and River Ice Phenology Database

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Global Lake and River Ice Phenology Database contains freeze and thaw/breakup dates as well as other descriptive ice cover data for 865 lakes and rivers in the...

  6. Russian River Ice Thickness and Duration

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set consists of river ice thickness measurements, and beginning and ending dates for river freeze-up events from fifty stations in northern Russia. The...

  7. Sprague River Oregon Built Features 1968

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  8. Sprague River Oregon Centerline North Fork 2005

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  9. Sprague River Oregon Centerline North Fork 1968

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  10. Sprague River Oregon Centerline Sycan 1940

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  11. Sprague River Oregon Centerline Sycan 2005

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  12. Lower Duck River Mussel Survey and Inventory

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The Duck River flows 290 miles through several major ecoregions before entering the impounded main stem Tennessee River at Sycamore Landing, Tennessee, adjacent to...

  13. Sprague River Oregon Centerline North Fork 1975

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  14. Sprague River Oregon Centerline Sycan circa 1870

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  15. Sprague River Oregon Centerline Sycan 1968

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  16. Sprague River Oregon Built Features 1940

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  17. Sprague River Oregon Centerline South Fork 1975

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  18. Sprague River Oregon Centerline Sycan 1975

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  19. An expanded role for river networks

    Science.gov (United States)

    Jonathan P. Benstead; David S. Leigh

    2012-01-01

    Estimates of stream and river area have relied on observations at coarse resolution. Consideration of the smallest and most dynamic streams could reveal a greater role for river networks in global biogeochemical cycling than previously thought.

  20. A stochastic model of river discharge fluctuations

    Science.gov (United States)

    Livina, V.; Ashkenazy, Y.; Kizner, Z.; Strygin, V.; Bunde, A.; Havlin, S.

    2003-12-01

    We study the daily river flow fluctuations of 30 international rivers. Using the detrended fluctuation analysis, we study the correlations in the magnitudes of river flow increments (volatilities), and find power-law correlations in volatilities for time scales less than 1 year; these correlations almost disappear for time scales larger than 1 year. Using surrogate data test for nonlinearity, we show that correlations in the magnitudes of river flow fluctuations are a measure for nonlinearity. We propose a simple nonlinear stochastic model for river flow fluctuations that reproduces the main scaling properties of the river flow series as well as the correlations and periodicities in the magnitudes of river flow increments. According to our model, the source of nonlinearity observed in the data is an interaction between a long-term correlated process and the river discharge itself.

  1. Chemical - Elwha River Dam Removal Study

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This study examines the ecosystem response of the Elwha River to the removal of the Elwha River dams. We will measure the following attributes of ecosystem response:...

  2. Biological - Elwha River Dam Removal Study

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This study examines the ecosystem response of the Elwha River to the removal of the Elwha River dams. We will measure the following attributes of ecosystem response:...

  3. Minnesota Wild and Scenic River Districts

    Data.gov (United States)

    Minnesota Department of Natural Resources — District boundaries for wild, scenic, and recreational rivers designated under the Minnesota State Wild and Scenic Rivers Act. Includes portions of the Minnesota...

  4. Sprague River Oregon Centerline South Fork 1940

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S....

  5. ALWAYS A RIVER - SUPPLEMENTAL ENVIRONMENTAL EDUCATION CURRICULUM ON THE OHIO RIVER AND WATER GRADES K - 12

    Science.gov (United States)

    This curriculum was developed as a significant component of the project, Always a River: The Ohio River and the American Experience, a six-state collaboration devoted to exploring the historical and cultural development of the Ohio River. The Always a River project is being joint...

  6. Many rivers to cross: Cross border co-operation in river management

    NARCIS (Netherlands)

    Verwijmeren, J.A.; Wiering, M.A.

    2007-01-01

    River basin management is a key concept in contemporary water policy. Since the management of rivers is best designed and implemented at the scale of the river basin, it seems obvious that we should not confine ourselves to administrative or geographical borders. In other words, river basin

  7. 78 FR 17087 - Special Local Regulation; New River Raft Race, New River; Fort Lauderdale, FL

    Science.gov (United States)

    2013-03-20

    ... Fort Lauderdale New River Raft Race, on Saturday, March 23, 2013. The special local regulation is... waterway of the United States during the Rotary Club of Fort Lauderdale New River Raft Race. On March 23... SECURITY Coast Guard 33 CFR Part 100 RIN 1625-AA08 Special Local Regulation; New River Raft Race, New River...

  8. 77 FR 45653 - Yakima River Basin Conservation Advisory Group; Yakima River Basin Water Enhancement Project...

    Science.gov (United States)

    2012-08-01

    ... Conservation Advisory Group; Yakima River Basin Water Enhancement Project, Yakima, WA AGENCY: Bureau of... Committee Act, the Yakima River Basin Conservation Advisory Group, Yakima River Basin Water Enhancement... River Basin Water Conservation Program. DATES: The meeting will be held on Tuesday, August 21, 2012...

  9. Columbia River Component Data Evaluation Summary Report

    Energy Technology Data Exchange (ETDEWEB)

    C.S. Cearlock

    2006-08-02

    The purpose of the Columbia River Component Data Compilation and Evaluation task was to compile, review, and evaluate existing information for constituents that may have been released to the Columbia River due to Hanford Site operations. Through this effort an extensive compilation of information pertaining to Hanford Site-related contaminants released to the Columbia River has been completed for almost 965 km of the river.

  10. 33 CFR 117.1058 - Snake River.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Snake River. 117.1058 Section 117... OPERATION REGULATIONS Specific Requirements Washington § 117.1058 Snake River. (a) The draw of the Burlington Northern Santa Fe railroad bridge across the Snake River at mile 1.5 between Pasco and Burbank is...

  11. The science and practice of river restoration

    Science.gov (United States)

    Wohl, Ellen; Lane, Stuart N.; Wilcox, Andrew C.

    2015-08-01

    River restoration is one of the most prominent areas of applied water-resources science. From an initial focus on enhancing fish habitat or river appearance, primarily through structural modification of channel form, restoration has expanded to incorporate a wide variety of management activities designed to enhance river process and form. Restoration is conducted on headwater streams, large lowland rivers, and entire river networks in urban, agricultural, and less intensively human-altered environments. We critically examine how contemporary practitioners approach river restoration and challenges for implementing restoration, which include clearly identified objectives, holistic understanding of rivers as ecosystems, and the role of restoration as a social process. We also examine challenges for scientific understanding in river restoration. These include: how physical complexity supports biogeochemical function, stream metabolism, and stream ecosystem productivity; characterizing response curves of different river components; understanding sediment dynamics; and increasing appreciation of the importance of incorporating climate change considerations and resiliency into restoration planning. Finally, we examine changes in river restoration within the past decade, such as increasing use of stream mitigation banking; development of new tools and technologies; different types of process-based restoration; growing recognition of the importance of biological-physical feedbacks in rivers; increasing expectations of water quality improvements from restoration; and more effective communication between practitioners and river scientists.

  12. Water quality of the Modder River

    Directory of Open Access Journals (Sweden)

    N. Koning

    1999-07-01

    Full Text Available Seasonal and spatial patterns in the Modder River system, the influence of Botshabelo's sewage outflow’ on the water quality of the river, as well as the presence of any toxic compounds were determined. The Modder and Klein Modder Rivers do not follow distinctive seasonal patterns in terms of chemical parameters.

  13. The Nile River and Egyptian Foreign Policy

    African Journals Online (AJOL)

    percent of the territory fall within the Nile River basin (FAO 1997). The percentage of. Egypt's population in the Nile River basin accounts for more than 85 ..... Kagera, which flows into Lake Victoria, recognised the equitable utilisation of the river in such a way that would not jeopardise the interests of other fluvial states. Third,.

  14. Forms of Nutrients in Rivers Flowing into Lake Chaohu: A Comparison between Urban and Rural Rivers

    Directory of Open Access Journals (Sweden)

    Lei Zhang

    2015-08-01

    Full Text Available Nutrient inputs from rivers play an important role in lake eutrophication. To compare the forms characteristics of phosphorus (P and nitrogen (N in rivers flowing through rural and urban areas, water samples were collected seasonally from five urban rivers and six rural rivers flowing to Lake Chaohu, China. Higher total phosphorus (TP, particulate phosphorus (PP, soluble reactive phosphorus (SRP, and dissolved nonreactive phosphorus (DNP concentrations and SRP/TP percentages were observed in urban rivers than in rural rivers, and PP/TP and DNP/TP ratios were lower in urban rivers than in rural rivers. The concentrations of total nitrogen (TN and all N forms other than dissolved organic nitrogen (DON were significantly higher in urban rivers than in rural rivers. NH4+/TN levels were higher in urban rivers, whereas PN/TN and DON/TN ratios were significantly lower in urban rivers compared with rural rivers. NO3−/TN and NO2−/TN levels were similar between the two groups of rivers. TP, BD-P, and NaOH-P levels in urban river surface sediments were significantly higher than those in rural rivers. NaOH-P/TP ratios were significantly elevated in urban rivers, whereas HCl-P/TP and Res-P/TP ratios were significantly lower compared with rural rivers. Urban rivers have transferred large quantities of NH4+ and SRP into Lake Chaohu, resulting in higher TP and TN levels and NH4+/TN and SRP/TP ratios. Decreasing the input of NH4+ and SRP into urban rivers is a high priority for mitigating eutrophication and algal blooms in Lake Chaohu.

  15. from cross river estuary, nigeria

    African Journals Online (AJOL)

    U,F1,:1.,U_ rt as so. 75 $00 o 25 so 15 109 i. FIG. 3: VARIATION IN STOMACH FULLNESS OF PELLONULA Ieonesis FROM CROSS. RIVER ESTUARY, NIGERIA WITH SEXES, SIZES AND SEASONS. Results on ontogenetic diet composition shows that LSG ate more preyfishes and ants than. 886 while 886 ate ,more ...

  16. Colloids in the River Inn

    Science.gov (United States)

    Ueckert, Martina; Niessner, Reinhard; Baumann, Thomas

    2015-04-01

    In the light of an increasing number of technical applications using nanoparticles and reports of adverse effects of engineered nanoparticles, research on the occurrence and stability of particles in all compartments has to be intensified. Colloids in river water represent the geologic setting, environmental conditions, and the anthropogenic use in its catchment. The river not only acts as a sink for nanoparticles but also as the source term due to exchange in the hyporheic zone and in bank filtration setups. The concentration, size distribution and elemental composition of particles in the River Inn were studied from the source in the Swiss Alps to the river mouth at Passau from 2008 to 2014. Samples were collected after each tributary from a sub-catchment and filtered on site using a new filtration device for gentle filtration. The elemental composition was determined after acid digestion with ICP/MS. SEM/EDX analysis provided morphological and elemental information for single particles. A complementary chemical analysis of the river water was performed to assess the geochemical stability of individual particles. As presented at EGU 2014, particles in the upper, rural parts mainly reveal changes in the geological setting of the tributary catchments. Not unexpectedly, particles originating from crystalline rocks, were more stable than particles originating from calcareous rocks. Anthropogenic and industrial influences increase in the lower parts. This went together with a change of the size distribution, an increase of the number of organic particles, and a decrease of the microfauna. Interestingly, specific leisure activities in a sub-catchment, like extensive downhill skiing, manifest itself in the particle composition. This general setting was validated in last year's sampling campaigns. An interesting change in on site parameters and hydrochemical composition was seen during all sampling campaigns at an inflow from the valley Kaunertal, Austria. Therefore

  17. MICROPHYTOBENTHOS IN THE SUTLA RIVER

    Directory of Open Access Journals (Sweden)

    Marija Tomec

    2009-10-01

    Full Text Available The Sutla river is a river along Croatian/Slovenian border. Its length is about 91 km, out of which 89 km in Croatia. Microphytobenthos investigations have been performed at six locations along the Sutla river on Croatian territory. Samples were collected from specific areas of characteristic habitats. Beside sample collection, basic physico–chemical parameters were measured: water temperature, pH values and quantity of water dissolved oxygen. Water temperature changed depending on air temperature and the depth of the river, ranging from 5.1ºC to 6.3ºC. pH values were between 7.77 and 8.14, and dissolved oxygen concentrations (mg/L O2 at the six locations ranged between 8.6 mg/L and 14.9 mg/L. Quantitative microphytobenthos composition comprised 87 microphythic species belonging to the systematic groups of Bacteriophyta, Cyanobacteria and Chrysophyta (Bacillariophyceae and Xanthophyceae. The most numerous group were the diatoms or Bacillariophyceae (76 species or 88.3%, with dominance of the species of the genera Achnanthes, Cocconeis, Cymbella, Gomphonema, Navicula, Nitzschia and Surirella. The group Cyanobacteria was represented with relatively small number of species (9 species or 10%, with the dominance of filamentous algae belonging to the genus Phormidium. From the total number of the determined microphytobenthic species, 73 species or 84% were indicators of saprobity. Most of them were beta–mezosaprobic indicators. Based on the indicator values of determined microphytobenthic species at six investigated locations, P–B saprobity index was in the range from 1.8 to 2.0. These values suggested that the water at the investigated part of the Sutla river belonged to the second class of Croatian Water Quality Directive.

  18. Health evaluation indicator system for urban landscape rivers, case study of the Bailianjing River in Shanghai

    Science.gov (United States)

    Wang, Juan; Wang, Yue; Yang, Haizhen; Lu, Zhibo; Xu, Xiaotian

    2010-11-01

    The River Bailianjing is an iconic landscape feature known to all residents in Pudong area and running through the Shanghai Expo 2010 Park. The river and its basin was a complex living ecosystem which supports a unique variety of flora and fauna several decades ago. However, as a result of unsuccessful pollution source control, sewage and first flow of the storm water is directly coming into the river in some catchment. The water quality of the river is seriously organically polluted now. The typical organic pollutants are COD, NH3-N, TN and TP, which cause the extinction of the water plants and aquatic. Furthermore, the artificial hard river banks isolate the river course and the land, which damaged the whole ecological system totally. The nature of the River Bailianjing and its history has resulted in many government departments and authorities and non government organizations having jurisdiction and/or an interest in the river's management. As a new tool to improve river management, the river health assessment has become the major focus of ecological and environmental science. Consequently, research on river health evaluation and its development on river management are of great theoretical and practical significance. In order to evaluate the healthy status of the River Bailianjing and prepare comprehensive scientific background data for the integrated river ecological rehabilitation planning, the health evaluation indicator system for River Bailianjing is brought forward. The indicator system has three levels: the first is target layer; the second is criteria layer, including five fields: water quality characteristics, hydrology characteristics, river morphology, biological characteristics and river scenic beauty; the third is an index layer, a total of 15 specific indicators included. Fuzzy AHP method is used to evaluate the target river's health status, and five grades are set up to describe it: healthy, sub health, marginal, unhealthy and pathological. The

  19. Morphogenèse, climat et sociétés dans la plaine de Sfax (Tunisie depuis le Pléistocène supérieur : l'exemple du bassin versant de l'oued Chaâl-Tarfaoui

    Directory of Open Access Journals (Sweden)

    Noômène Fehri

    2007-12-01

    Full Text Available À travers une démarche chronologique et une approche géomorpho-historico-archéologique, cet article est une synthèse sur les rapports entre la morphogenèse, les variations climatiques et les sociétés humaines depuis le Pléistocène supérieur jusqu'à nos jours.Dans le bassin versant de l'oued Chaâl-Tarfaoui, le Pléistocène supérieur est représenté par un niveau sableux à concrétions calcaires. À l'Holocène, le remaniement de ces sables essentiellement éoliens accumulés, selon toute vraisemblance, à la fin du Würm par des vents de secteur Nord, génère deux nappes alluviales majeures : une basse nappe alluviale holocène pré-romaine (préhistorique ? et une très basse nappe alluviale holocène historique post-romaine. Les crues exceptionnelles de 1969 ont édifié une troisième nappe mais d'une épaisseur moins importante que les précédentes.This paper is a synthesis of relations between morphogenetic activity, climatic changes and human societies from Upper Pleistocene up to now, using a chronological and geomorpho-historico-archaeological approach.In wadi Chaâl-Tarfaoui catchment, Upper Pleistocene formations are sandy with nodular calcretes very probably wind blown at the end of Würmian period by southward winds. During Holocene they were removed by runoff into two main alluvial formations. The older one is the low Holocene historic pre-roman (prehistoric ? formation and the younger one is the very low Holocene historic post-roman formation. A third formation has been deposited by 1969 exceptional floods. It is thinner than the previous formations.

  20. Trace Elements in River Waters

    Science.gov (United States)

    Gaillardet, J.; Viers, J.; Dupré, B.

    2003-12-01

    Trace elements are characterized by concentrations lower than 1 mg L-1 in natural waters. This means that trace elements are not considered when "total dissolved solids" are calculated in rivers, lakes, or groundwaters, because their combined mass is not significant compared to the sum of Na+, K+, Ca2+, Mg2+, H4SiO4, HCO3-, CO32-, SO42-, Cl-, and NO3-. Therefore, most of the elements, except about ten of them, occur at trace levels in natural waters. Being trace elements in natural waters does not necessarily qualify them as trace elements in rocks. For example, aluminum, iron, and titanium are major elements in rocks, but they occur as trace elements in waters, due to their low mobility at the Earth's surface. Conversely, trace elements in rocks such as chlorine and carbon are major elements in waters.The geochemistry of trace elements in river waters, like that of groundwater and seawater, is receiving increasing attention. This growing interest is clearly triggered by the technical advances made in the determination of concentrations at lower levels in water. In particular, the development of inductively coupled plasma mass spectrometry (ICP-MS) has considerably improved our knowledge of trace-element levels in waters since the early 1990s. ICP-MS provides the capability of determining trace elements having isotopes of interest for geochemical dating or tracing, even where their dissolved concentrations are extremely low.The determination of trace elements in natural waters is motivated by a number of issues. Although rare, trace elements in natural systems can play a major role in hydrosystems. This is particularly evident for toxic elements such as aluminum, whose concentrations are related to the abundance of fish in rivers. Many trace elements have been exploited from natural accumulation sites and used over thousands of years by human activities. Trace elements are therefore highly sensitive indexes of human impact from local to global scale. Pollution

  1. Maple River Subbasin, Red River of the North Reconnaissance Report.

    Science.gov (United States)

    1980-12-01

    officials report no anticipated problems with their water supply. Erosion Problems Wind erosion is prevalent over most of the subbasin. Cultivated ...fully investigated. Wastewater Management The Upper Mississippi River Basin Commission (1977) reported high fecal coliform counts and a fecal coliform ...of the subbasin’s land area is under cultivation , and another 6.6 percent is devoted to pasture. The major crops grown in the subbasin are

  2. Isotopic geochemistry of Panama rivers

    Science.gov (United States)

    Harmon, Russell S.; Worner, Gerhard; Pribil, Michael; Kern, Zoltan; Forizs, Istvan; Lyons, W. Berry; Gardner, Christopher B.; Goldsmith, Steven T.

    2015-01-01

    River water samples collected from 78 watersheds rivers along a 500-km transect across a Late Cretaceous-Tertiary andesitic volcanic arc terrane in west-central Panama provide a synoptic overview of riverine geochemistry, chemical denudation, and CO2 consumption in the tropics. D/H and 18O/16O relationships indicate that bedrock dissolution of andesitic arc crust in Panama is driven by water-rock interaction with meteoric precipitation as it passes through the critical zone, with no evidence of a geothermal or hydrothermal input. Sr-isotope relationships suggest a geochemical evolution for Panama riverine waters that involves mixing of bedrock pore water with water having 87Sr/86Sr ratios between 0.7037-0.7043 and relatively high Sr-contents with waters of low Sr content that enriched in radiogenic Sr that are diluted by infiltrating rainfall to variable extents.

  3. Resilience of river flow regimes.

    Science.gov (United States)

    Botter, Gianluca; Basso, Stefano; Rodriguez-Iturbe, Ignacio; Rinaldo, Andrea

    2013-08-06

    Landscape and climate alterations foreshadow global-scale shifts of river flow regimes. However, a theory that identifies the range of foreseen impacts on streamflows resulting from inhomogeneous forcings and sensitivity gradients across diverse regimes is lacking. Here, we derive a measurable index embedding climate and landscape attributes (the ratio of the mean interarrival of streamflow-producing rainfall events and the mean catchment response time) that discriminates erratic regimes with enhanced intraseasonal streamflow variability from persistent regimes endowed with regular flow patterns. Theoretical and empirical data show that erratic hydrological regimes typical of rivers with low mean discharges are resilient in that they hold a reduced sensitivity to climate fluctuations. The distinction between erratic and persistent regimes provides a robust framework for characterizing the hydrology of freshwater ecosystems and improving water management strategies in times of global change.

  4. Observations on the Primary Migration of Oil in the la Luna Source Rocks of the Maracaibo Basin, Venezuela Observations de la migration primaire de l'huile dans les roches mères de la Formation de La Luna dans le bassin de Maracaïbo, Venezuela

    Directory of Open Access Journals (Sweden)

    Talukdar S.

    2006-11-01

    Full Text Available In the present work, an integrated approach has been made to understand the primary migration of oil in the organic-rich, oil prone, predominantly carbonate source rocks of the La Luna Formation of the Maracaibo Basin. Geochemical data on source rock extracts and the simulation of oil generation by hydrous-pyrolysis experiments indicate that the primary migration and expulsion of oil began at an early stage of thermal maturity and that the bulk oil expulsion at peak generation could have been as high as 75%. Fluorescence and transmitted light petrography of the source rocks at different maturity levels show the dominant mode of oil expulsion through microfractures. It is interpreted from the geochemical and geological data that the primary migration of oil in the La Luna source rocks took place as a separate oil phase through microfractures caused by the excess fluid pressure due to hydrocarbon generation. The oils expelled from the La Luna source are enriched in saturated hydrocarbons and depleted in resins + asphaltenes compared to the La Luna rock extracts. However the distributions of n-alkanes, in the oils and the rock extracts are very similar, which suggest that fractionation of the n-alkanes did not occur during the primary migration. In the Maracaibo Basin, updip lateral primary migration of oil within the La Luna source system seem to have occurred for a considerable distance. Local internal migration has been observed at a relatively early stage of maturity. Cette étude consiste en une approche intégrée cherchant à comprendre la migration primaire de l'huile dans les roches mères de la Formation de La Luna dans le bassin de Maracaïbo, riches en matière organique, génératrices d'huile et à dominante carbonatée. Les données géochimiques sur des extraits de roches mères et la simulation de genèse d'huile par des expériences de pyrolyse en présence d'eau indiquent que la migration primaire et l'expulsion de l'huile ont

  5. A river runs through it

    OpenAIRE

    F P J G Lafeber

    2010-01-01

    A river runs through it is een waar gebeurd verhaal over twee jongens, Norman en Paul, die in het begin van de 20ste eeuw opgroeiden in landelijk Montana (Amerika). Norman is in zijn jeugd een gereserveerde persoonlijkheid, terwijl Paul een rebelse ondeugd is. Beiden hebben echter een grote liefde voor vliegvissen. Het verhaal, gedeeltelijk autobiografisch, is geschreven in 1976 door Norman Maclean1. Er is geen Nederlandse vertaling. Wel is het boek in 1992 verfilmd onder regie van Robert Red...

  6. River Ehen and tributaries SSSI

    OpenAIRE

    1998-01-01

    This is the River Ehen and Tributaries SSSI consultation Protocol for the Environment Agency with English Nature, produced in 1998. The Protocol is intended to provide for consistency of approach, to clarify responsibilities and help to streamline the statutory consultation and consenting procedures in which both organisations are involved. It provides guiding principles on the approach to management issues. Based on the operations likely to damage the special interest (OLDSI) which forms par...

  7. Saving the Mekong River Basin

    OpenAIRE

    Houba, Harold; Pham Do, Kim Hang; Zhu, Xueqin

    2011-01-01

    The Mekong River (MR) is shared by six countries: China, Myanmar, Thailand, Laos, Cambodia, and Vietnam. Over the years there have been both conflict and cooperation on managing the water resources to meet population growth, climate change and the desire for economic development. Currently, the MR Committee (MRC) has weak policy instruments. This paper exploits an axiomatic bargaining approach to examine how China and the MRC might negotiate effective joint management. We investigate what wel...

  8. A Family By Yellow River

    OpenAIRE

    China Central Television (CCTV)

    2005-01-01

    A 63 minutes film produced by CCTV. It is only for education and non-commercial purpose. With thanks to Documentary Research Committee, of the Chinese Broadcasting and Television Academy. This filmed 5 years' record of a small village community, namely Lijiashan (Li's Mountains) of Qikou, Shanxi Province, might serve as an illustration for a profoundly changing rural China. A town in the valley of the Yellow River, Qikou lies culturally in the heartland of the vast yellowish land. It used ...

  9. Resilience of river flow regimes

    OpenAIRE

    Botter, G.; Basso, S.; Rodriguez-Iturbe, I.; Rinaldo, A.

    2013-01-01

    Landscape and climate alterations foreshadow global-scale shifts of river flow regimes. However, a theory that identifies the range of foreseen impacts on streamflows resulting from inhomogeneous forcings and sensitivity gradients across diverse regimes is lacking. Here, we derive a measurable index embedding climate and landscape attributes (the ratio of the mean interarrival of streamflow-producing rainfall events and the mean catchment response time) that discriminates erratic regimes with...

  10. Floquet theory of river ecomorphodynamics

    Science.gov (United States)

    Bertagni, Matteo; Perona, Paolo; Camporeale, Carlo

    2017-04-01

    Most of world population lives close and depends on freshwaters and related ecosystems. As dramatic consequence, 48% of all rivers worldwide are hydrologically altered. Although mankind lives by and controls river systems since millennia, a complete physically-based understanding of the links among the various processes involved still remains elusive. Three fundamental aspects control the physical state of natural rivers: flow stochasticity, sediment transport and vegetation dynamics. The present work tries to shed light on the bonds among these processes, following a temporal flow for the river dynamics. During a particularly extreme flood event any previous ecomorphological pattern is erased by the flow. However, sediment transport triggers the formation of migrating bedforms, called free bars. Through a nonlinear analysis, with center manifold projection, a long analytical expression is obtained for the bars amplitude, thus completely defining bars geometry in the parameters space. Once the formative event is extinguished, the flow rate decreases and the recently formed bars can partially emerge from water. At this point vegetation develops over the bare bars depending on flow stochasticity. As a realistic model for the flow stochasticity the compound Poisson process is considered. However, in order to make the computation analytically feasible, the stochastic time series for the discharge is replaced with an equivalent periodic one, obtained as a sequence of a typical average event of the stochastic series. In this manner, the new periodic streamflow signal, preserves the same statistical properties of its stochastic correspondent. The periodic equation for the vegetation dynamics can thus be spatially solved through Floquet theory, gaining which portion of the bar is asymptotically colonised by vegetation. In conclusion, this is the first theoretical work linking the trend of the vegetated area with the flow parameters, and confirming that high flow

  11. Raft River geoscience case study

    Energy Technology Data Exchange (ETDEWEB)

    Dolenc, M.R.; Hull, L.C.; Mizell, S.A.; Russell, B.F.; Skiba, P.A.; Strawn, J.A.; Tullis, J.A.

    1981-11-01

    The Raft River Geothermal Site has been evaluated over the past eight years by the United States Geological Survey and the Idaho National Engineering Laboratory as a moderate-temperature geothermal resource. The geoscience data gathered in the drilling and testing of seven geothermal wells suggest that the Raft River thermal reservoir is: (a) produced from fractures found at the contact metamorphic zone, apparently the base of detached normal faulting from the Bridge and Horse Well Fault zones of the Jim Sage Mountains; (b) anisotropic, with the major axis of hydraulic conductivity coincident to the Bridge Fault Zone; (c) hydraulically connected to the shallow thermal fluid of the Crook and BLM wells based upon both geochemistry and pressure response; (d) controlled by a mixture of diluted meteoric water recharging from the northwest and a saline sodium chloride water entering from the southwest. Although the hydrogeologic environment of the Raft River geothermal area is very complex and unique, it is typical of many Basin and Range systems.

  12. How do atmospheric rivers form?

    Science.gov (United States)

    Dacre, Helen

    2015-04-01

    The term atmospheric river is used to describe corridors of strong water vapor transport in the troposphere. Filaments of enhanced water vapor, commonly observed in satellite imagery extending from the subtropics to the extratropics, are routinely used as a proxy for identifying these regions of strong water vapor transport. The precipitation associated with these filaments of enhanced water vapor can lead to high impact flooding events. However, there remains some debate as to how these filaments form. In this study we analyse the transport of water vapor within a climatology of wintertime North Atlantic extratropical cyclones. Results show that atmospheric rivers are formed by the cold front which sweeps up water vapor in the warm sector as it catches up with the warm front. This causes a narrow band of high water vapor content to form ahead of the cold front at the base of the warm conveyor belt airflow. Thus, water vapor in the cyclone's warm sector, and not long-distance transport of water vapor from the subtropics, is responsible for the generation of filaments of high water vapor content. A continuous cycle of evaporation and moisture convergence within the cyclone replenishes water vapor lost via precipitation. Thus, rather than representing a direct and continuous feed of moist air from the subtropics into the centre of a cyclone (as suggested by the term atmospheric river), these filaments are, in-fact, the result of water vapor exported from the cyclone and thus they represent the footprints left behind as cyclones travel polewards from subtropics.

  13. THE IMPACT OF URBAN RIVER VALLEY LAND USE AND MORPHOLOGICAL CONDITION FOR RIVER VEGETATION IN RIVER BED

    Directory of Open Access Journals (Sweden)

    Adam Marek Hamerla

    2016-09-01

    Full Text Available This paper is focused on the results of research about the relationship between hydromorphological condition and share of plants in river bed. Assessment, made in urbanized and heavy industry part of Upper Silesia, provide proof of strong relation between land use, land cover in river valley and type of river vegetation. Moreover, the relationship between hydromorphological indicators and groups of plants was defined.

  14. The Upper Mississippi River System—Topobathy

    Science.gov (United States)

    Stone, Jayme M.; Hanson, Jenny L.; Sattler, Stephanie R.

    2017-03-23

    The Upper Mississippi River System (UMRS), the navigable part of the Upper Mississippi and Illinois Rivers, is a diverse ecosystem that contains river channels, tributaries, shallow-water wetlands, backwater lakes, and flood-plain forests. Approximately 10,000 years of geologic and hydrographic history exist within the UMRS. Because it maintains crucial wildlife and fish habitats, the dynamic ecosystems of the Upper Mississippi River Basin and its tributaries are contingent on the adjacent flood plains and water-level fluctuations of the Mississippi River. Separate data for flood-plain elevation (lidar) and riverbed elevation (bathymetry) were collected on the UMRS by the U.S. Army Corps of Engineers’ (USACE) Upper Mississippi River Restoration (UMRR) Program. Using the two elevation datasets, the U.S. Geological Survey (USGS) Upper Midwest Environmental Sciences Center (UMESC) developed a systemic topobathy dataset.

  15. Rare earth elements in river waters

    Science.gov (United States)

    Goldstein, Steven J.; Jacobsen, Stein B.

    1988-01-01

    To characterize the input to the oceans of rare earth elements (REE) in the dissolved and the suspended loads of rivers, the REE concentrations were measured in samples of Amazon, Indus, Mississippi, Murray-Darling, and Ohio rivers and in samples of smaller rivers that had more distinct drainage basin lithology and water chemistry. It was found that, in the suspended loads of small rivers, the REE pattern was dependent on drainage basin geology, whereas the suspended loads in major rivers had relatively uniform REE patterns and were heavy-REE depleted relative to the North American Shale composite (NASC). The dissolved loads in the five major rivers had marked relative heavy-REE enrichments, relative to the NASC and the suspended material, with the (La/Yb)N ratio of about 0.4 (as compared with the ratio of about 1.9 in suspended loads).

  16. 1890's Land Cover/Use - Mississippi River Commission Surveys, Open River 2

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — In the late 1880's and early 1900's the Mississippi River Commission (MRC) conducted an extensive high-resolution survey of the Mississippi River from Cairo,...

  17. 1890's Land Cover/Use - Mississippi River Commission Surveys, Open River 1

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — In the late 1880's and early 1900's the Mississippi River Commission (MRC) conducted an extensive high-resolution survey of the Mississippi River from Cairo,...

  18. New River Dam Foundation Report. Gila River Basin: Phoenix, Arizona and Vicinity (Including New River).

    Science.gov (United States)

    1985-10-01

    further downstream before merging with the Agua Fria River. 6 Site Geology 2.08 The geological formations present within the project area consist...channel and tributary wash deposits. The older Quaternary alluvium also includes the usually thin spotty veneer of residual soil and slope wash found on...that post magmatic hydrothermal alteration may have been caused by residual aqueous-gaseous fluids rising through the intergranular pore spaces in the

  19. Protecting and Enhancing River and Stream Continuity

    OpenAIRE

    Jackson, Scott D.; Bowden, Alison; Graber, Brian

    2007-01-01

    As long linear ecosystems, rivers and streams are particularly vulnerable to fragmentation. There is growing concern about the role of road crossings – and especially culverts – in altering habitats and disrupting river and stream continuity. The River and Stream Continuity Project began in the year 2000 with a startup grant from the Massachusetts Watershed Initiative. The University of Massachusetts took the lead in convening a group of people from a variety of agencies and organizations who...

  20. Ecological management of urban rivers in China

    Science.gov (United States)

    Zhang, Junhong; Hou, Xin; Xu, Yiping

    2017-03-01

    At present, China's urban river is widespread with serious pollution, poor water quality, poor water mobility and other issues. In this article, we analyzed the root causes of urban river water environment problems systematically, then puts forward the ways to solve the problems, which including implement the "river length system", strengthen the control of pollution sources, persist in ecological concepts, establish long-term mechanism and strengthen publicity and education.

  1. Monitoring river discharge with remotely sensed imagery using river island area as an indicator

    Science.gov (United States)

    Ling, Feng; Cai, Xiaobin; Li, Wenbo; Xiao, Fei; Li, Xiaodong; Du, Yun

    2012-01-01

    River discharge is an important parameter in understanding water cycles, and consistent long-term discharge records are necessary for related research. In practice, discharge records based on in situ measurement are often limited because of technological, economic, and institutional obstacles. Satellite remote sensing provides an attractive alternative way to measure river discharge by constructing an empirical rating curve between the parameter provided by remote sensing techniques and simultaneous ground discharge data. River width is a popular parameter for constructing the empirical curve, since change in river discharge can be represented by a change in river width. In some rectangular channels, however, river width does not change significantly with river discharge, so an alternative parameter is necessary. We analyze a novel technique using river island area as an indicator of discharge. A river island often has a flat terrain, and its area decreases with higher discharge. This technique is validated by three river islands in the Yangtze River in China. All 61 remotely sensed images acquired by the HuanJing (HJ) satellites from 2009 to 2010 were correlated with corresponding in situ discharge of the nearby Zhicheng hydrological station. The performance of fitted curves for inferring river discharge is validated using 36 HJ images taken in 2011, and the influence of remotely sensed imagery and river islands is discussed. All three river islands can be used as indicators of river discharge, although their performances are much different. For the river island with the best result, the mean accuracy of the estimates is less than 10% of the observed discharge, and all relative errors are within 20%, validating the effectiveness of the proposed method.

  2. Forms of Nutrients in Rivers Flowing into Lake Chaohu: A Comparison between Urban and Rural Rivers

    OpenAIRE

    Lei Zhang; Shiguang Shao; Cheng Liu; Tingting Xu; Chengxin Fan

    2015-01-01

    Nutrient inputs from rivers play an important role in lake eutrophication. To compare the forms characteristics of phosphorus (P) and nitrogen (N) in rivers flowing through rural and urban areas, water samples were collected seasonally from five urban rivers and six rural rivers flowing to Lake Chaohu, China. Higher total phosphorus (TP), particulate phosphorus (PP), soluble reactive phosphorus (SRP), and dissolved nonreactive phosphorus (DNP) concentrations and SRP/TP percentages were observ...

  3. Savannah River Laboratory monthly report, October 1991

    Energy Technology Data Exchange (ETDEWEB)

    Ferrell, J.M. [comp.

    1991-12-31

    This document details monthly activities at the Savannah River Laboratory. Topics addressed are reactor operation, tritium facilities and production; separations operations; environmental concerns; and waste management. (FI)

  4. Savannah River Laboratory monthly report, October 1991

    Energy Technology Data Exchange (ETDEWEB)

    Ferrell, J.M. (comp.)

    1991-01-01

    This document details monthly activities at the Savannah River Laboratory. Topics addressed are reactor operation, tritium facilities and production; separations operations; environmental concerns; and waste management. (FI)

  5. Savannah River Laboratory monthly report, September 1991

    Energy Technology Data Exchange (ETDEWEB)

    Ferrell, J.M. [comp.

    1991-12-31

    This document details monthly activities at the Savannah River Laboratory. Topics addressed are reactor operation, tritium facilities and production; separation operations; environmental concerns; and waste management. (FI)

  6. Savannah River Laboratory monthly report, September 1991

    Energy Technology Data Exchange (ETDEWEB)

    Ferrell, J.M. (comp.)

    1991-01-01

    This document details monthly activities at the Savannah River Laboratory. Topics addressed are reactor operation, tritium facilities and production; separation operations; environmental concerns; and waste management. (FI)

  7. The Columbia River System Inside Story

    Energy Technology Data Exchange (ETDEWEB)

    None

    2001-04-01

    The Columbia River is one of the greatest natural resources in the western United States. The river and its tributaries touch the lives of nearly every resident of the Pacific Northwest—from fostering world-famous Pacific salmon to supplying clean natural fuel for 50 to 65 percent of the region’s electrical generation. Since early in the 20th century, public and private agencies have labored to capture the benefits of this dynamic river. Today, dozens of major water resource projects throughout the region are fed by the waters of the Columbia Basin river system.

  8. Savannah River Laboratory monthly report, August 1991

    Energy Technology Data Exchange (ETDEWEB)

    Ferrell, J.M. (comp.)

    1991-01-01

    This document details monthly activities at the Savannah River Laboratory. Topics addressed are reactor operation, tritium facilities and production; separation operations; environmental concerns; and waste management. (FI)

  9. Savannah River Laboratory monthly report, July 1991

    Energy Technology Data Exchange (ETDEWEB)

    Ferrell, J.M. [comp.

    1991-12-31

    This document details monthly activities at the Savannah River Laboratory. Topics addressed are reactor operation; tritium facilities and production; separation operations; environmental concerns; and waste management. (FI)

  10. Savannah River Laboratory monthly report, August 1991

    Energy Technology Data Exchange (ETDEWEB)

    Ferrell, J.M. [comp.

    1991-12-31

    This document details monthly activities at the Savannah River Laboratory. Topics addressed are reactor operation, tritium facilities and production; separation operations; environmental concerns; and waste management. (FI)

  11. Savannah River Laboratory monthly report, November 1991

    Energy Technology Data Exchange (ETDEWEB)

    Ferrell, J.M. [comp.

    1991-12-31

    This document details monthly activities at the Savannah River Laboratory. Topics addressed are reactor operation; tritium facilities and production; separation operations; environmental concerns; and waste management. (FI)

  12. Bathymetric surveys of the Neosho River, Spring River, and Elk River, northeastern Oklahoma and southwestern Missouri, 2016–17

    Science.gov (United States)

    Hunter, Shelby L.; Ashworth, Chad E.; Smith, S. Jerrod

    2017-09-26

    In February 2017, the Grand River Dam Authority filed to relicense the Pensacola Hydroelectric Project with the Federal Energy Regulatory Commission. The predominant feature of the Pensacola Hydroelectric Project is Pensacola Dam, which impounds Grand Lake O’ the Cherokees (locally called Grand Lake) in northeastern Oklahoma. Identification of information gaps and assessment of project effects on stakeholders are central aspects of the Federal Energy Regulatory Commission relicensing process. Some upstream stakeholders have expressed concerns about the dynamics of sedimentation and flood flows in the transition zone between major rivers and Grand Lake O’ the Cherokees. To relicense the Pensacola Hydroelectric Project with the Federal Energy Regulatory Commission, the hydraulic models for these rivers require high-resolution bathymetric data along the river channels. In support of the Federal Energy Regulatory Commission relicensing process, the U.S. Geological Survey, in cooperation with the Grand River Dam Authority, performed bathymetric surveys of (1) the Neosho River from the Oklahoma border to the U.S. Highway 60 bridge at Twin Bridges State Park, (2) the Spring River from the Oklahoma border to the U.S. Highway 60 bridge at Twin Bridges State Park, and (3) the Elk River from Noel, Missouri, to the Oklahoma State Highway 10 bridge near Grove, Oklahoma. The Neosho River and Spring River bathymetric surveys were performed from October 26 to December 14, 2016; the Elk River bathymetric survey was performed from February 27 to March 21, 2017. Only areas inundated during those periods were surveyed.The bathymetric surveys covered a total distance of about 76 river miles and a total area of about 5 square miles. Greater than 1.4 million bathymetric-survey data points were used in the computation and interpolation of bathymetric-survey digital elevation models and derived contours at 1-foot (ft) intervals. The minimum bathymetric-survey elevation of the Neosho

  13. Upstream control of river anastomosis by sediment overloading, upper Columbia River, British Columbia, Canada

    NARCIS (Netherlands)

    Makaske, Bart; Lavooi, Eva; de Haas, Tjalling; Kleinhans, Maarten G.; Smith, Derald G.

    2017-01-01

    Anastomosing rivers, systems of multiple interconnected channels that enclose floodbasins, constitute a major category of rivers for which various sedimentary facies models have been developed. While the sedimentary products of anastomosing rivers are relatively well-known, their genesis is still

  14. Upstream control of river anastomosis by sediment overloading, upper Columbia River, British Columbia, Canada.

    NARCIS (Netherlands)

    Makaske, A.; Lavooi, E.; Haas, de Tjalling; Kleinhans, M.G.; Smith, D.G.

    2017-01-01

    Anastomosing rivers, systems of multiple interconnected channels that enclose floodbasins, constitute a major category of rivers for which various sedimentary facies models have been developed. While the sedimentary products of anastomosing rivers are relatively well-known, their genesis is still

  15. River-tide dynamics : Exploration of nonstationary and nonlinear tidal behavior in the Yangtze River estuary

    NARCIS (Netherlands)

    Guo, L.; Van der Wegen, M.; Jay, D.A.; Matte, P.; Wang, Z.B.; Roelvink, J.A.; He, Q.

    2015-01-01

    River-tide dynamics remain poorly understood, in part because conventional harmonic analysis (HA) does not cope effectively with nonstationary signals. To explore nonstationary behavior of river tides and the modulation effects of river discharge, this work analyzes tidal signals in the Yangtze

  16. 76 FR 75543 - Missisquoi River Technologies; Missisquoi River Hydro LLC; Notice of Transfer of Exemption

    Science.gov (United States)

    2011-12-02

    ... Transfer of Exemption 1. By letter filed November 16, 2011, Missisquoi River Technologies informed the... issued June 29, 1989,\\1\\ has been transferred to Missisquoi River Hydro LLC. The project is located on the Missisquoi River in Orleans County, Vermont. The transfer of an exemption does not require...

  17. 78 FR 28492 - Special Local Regulation; Low Country Splash, Wando River, Cooper River, and Charleston Harbor...

    Science.gov (United States)

    2013-05-15

    ... of Proposed Rulemaking A. Regulatory History and Information On March 26, 2013, we published a notice... River, Cooper River, and Charleston Harbor in Charleston, SC. The race will consist of approximately 500 swimmers. The race will commence at Daniel Island Pier, transit south in the Wando River, crossing the...

  18. 76 FR 24914 - Digital River Education Services, Inc., a Division of Digital River, Inc., Including Workers...

    Science.gov (United States)

    2011-05-03

    ... Employment and Training Administration Digital River Education Services, Inc., a Division of Digital River... Marketing (JEM), Including On-Site Lease Workers From Serenity Staffing, Accountemps, Silicon Valley, and... Assistance on January 28, 2011, applicable to workers of Digital River Education Services, Inc., a division...

  19. River Platform for Monitoring Erosion (RIPLE) in mountainous rivers

    Science.gov (United States)

    Michielin, Yoann; Nord, Guillaume; Esteves, Michel; Geay, Thomas; Hauet, Alexandre

    2017-04-01

    The RIPLE platform has been developed to allow a continuous monitoring at high temporal frequency ( 10 min) of water and solid fluxes in mountainous rivers. The scientific context of this development is defined as follows: (i) the simultaneous measurements of water discharge, bedload, suspension load and river bed topography contribute to the establishment of comprehensive mass balance at the catchment scale; (ii) measurements of the physical properties of fine sediments (size, shape, composition) provide information on the spatial origin of sediments within the catchment, the conditions for erosion and sedimentation processes within the river and the potential to transport other substances such as nutrients, metals, microorganisms. For the design of the platform, priority has been given to non-intrusive instruments due to their robustness. The basic prototype of the platform integrates the following instruments: water level and surface velocity radars, turbidimeters, conductivity probe, hydrophone, cameras, automatic water sampler and depth sounder. Other instruments are progressively integrated, such as the SCAF (system characterizing the sediment's settling velocity), an acoustic Doppler profiler and a spectrophotometer. A wireless telecommunication has been set up to allow remote interactions with the platform and data transmission. The RIPLE platform has been designed to facilitate its use and maintenance: user interface allowing data monitoring and remote configuration, sending alerts (SMS, mail) according to programmed conditions, flexibility of on-site installation and energy autonomy allowing to easily move the platform from one site to another site. In September 2016, the RIPLE platform was installed on a bridge across the Romanche river at Bourg d'Oisans (45.1159 °N, 6.0135 °E) for a testing period. After a presentation of the architecture of the platform, the first results derived from in situ measurements are discussed: the intercomparison of surface

  20. Large River Monitoring Forum Fish Assemblage Database 2016

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Large River Monitoring Forum compiled fish assemblage data for five large rivers in the U.S. as a part of a coordinated effort to compare and contract river...

  1. River classification is important for reporting ecological status and ...

    African Journals Online (AJOL)

    River classification is important for reporting ecological status and for the general ecological management of river systems by partitioning natural variability. A priori river classification by abiotic variables and validation of classifications obtained.

  2. Consequence Analyses Following Potential Savannah River Site Hydrological Releases

    Energy Technology Data Exchange (ETDEWEB)

    Blanchard, A.

    1999-07-28

    Postulated accidental release of radiological material to surface water bodies on the Savannah River Site and the resulting downstream contamination of the Savannah River pose a potential threat to downstream river users.

  3. An Assessment of River Resources for Louisiana Coastal Land Preservation

    Science.gov (United States)

    2008-05-01

    35 Table 4.2: Listing of existing Mississippi River diversions below Natchez (from...600,000 cfs. 37 Table 4.2: Listing of existing Mississippi River diversions below Natchez (from Andrus (2007)). Diversion River Mile (above

  4. Flood of August 24–25, 2016, Upper Iowa River and Turkey River, northeastern Iowa

    Science.gov (United States)

    Linhart, S. Mike; O'Shea, Padraic S.

    2018-02-05

    Major flooding occurred August 24–25, 2016, in the Upper Iowa River Basin and Turkey River Basin in northeastern Iowa following severe thunderstorm activity over the region. About 8 inches of rain were recorded for the 24-hour period ending at 4 p.m., August 24, at Decorah, Iowa, and about 6 inches of rain were recorded for the 24-hour period ending at 7 a.m., August 24, at Cresco, Iowa, about 14 miles northwest of Spillville, Iowa. A maximum peak-of-record discharge of 38,000 cubic feet per second in the Upper Iowa River at streamgage 05388250 Upper Iowa River near Dorchester, Iowa, occurred on August 24, 2016, with an annual exceedance-probability range of 0.2–1 percent. High-water marks were measured at six locations along the Upper Iowa River between State Highway 26 near the mouth at the Mississippi River and State Highway 76 about 3.5 miles south of Dorchester, Iowa, a distance of 15 river miles. Along the profiled reach of the Turkey River, a maximum peak-of-record discharge of 15,300 cubic feet per second at streamgage 05411600 Turkey River at Spillville, Iowa, occurred on August 24, 2016, with an annual exceedance-probability range of 1–2 percent. A maximum peak discharge of 35,700 cubic feet per second occurred on August 25, 2016, along the profiled reach of the Turkey River at streamgage 05411850 Turkey River near Eldorado, Iowa, with an annual exceedance-probability range of 0.2–1 percent. High-water marks were measured at 11 locations along the Turkey River between County Road B64 in Elgin and 220th Street, located about 4.5 miles northwest of Spillville, Iowa, a distance of 58 river miles. The high-water marks were used to develop flood profiles for the Upper Iowa River and Turkey River.

  5. Nitrogen and phosphorus in the Upper Mississippi River: Transport, processing, and effects on the river ecosystem

    Science.gov (United States)

    Houser, J.N.; Richardson, W.B.

    2010-01-01

    Existing research on nutrients (nitrogen and phosphorus) in the Upper Mississippi River (UMR) can be organized into the following categories: (1) Long-term changes in nutrient concentrations and export, and their causes; (2) Nutrient cycling within the river; (3) Spatial and temporal patterns of river nutrient concentrations; (4) Effects of elevated nutrient concentrations on the river; and (5) Actions to reduce river nutrient concentrations and flux. Nutrient concentration and flux in the Mississippi River have increased substantially over the last century because of changes in land use, climate, hydrology, and river management and engineering. As in other large floodplain rivers, rates of processes that cycle nitrogen and phosphorus in the UMR exhibit pronounced spatial and temporal heterogeneity because of the complex morphology of the river. This spatial variability in nutrient processing creates clear spatial patterns in nutrient concentrations. For example, nitrate concentrations generally are much lower in off-channel areas than in the main channel. The specifics of in-river nutrient cycling and the effects of high rates of nutrient input on UMR have been less studied than the factors affecting nutrient input to the river and transport to the Gulf of Mexico, and important questions concerning nutrient cycling in the UMR remain. Eutrophication and resulting changes in river productivity have only recently been investigated the UMR. These recent studies indicate that the high nutrient concentrations in the river may affect community composition of aquatic vegetation (e. g., the abundance of filamentous algae and duckweeds), dissolved oxygen concentrations in off-channel areas, and the abundance of cyanobacteria. Actions to reduce nutrient input to the river include changes in land-use practices, wetland restoration, and hydrological modifications to the river. Evidence suggests that most of the above methods can contribute to reducing nutrient concentration in

  6. Coastal river plumes: Collisions and coalescence

    Science.gov (United States)

    Warrick, Jonathan A.; Farnsworth, Katherine L.

    2017-02-01

    Plumes of buoyant river water spread in the ocean from river mouths, and these plumes influence water quality, sediment dispersal, primary productivity, and circulation along the world's coasts. Most investigations of river plumes have focused on large rivers in a coastal region, for which the physical spreading of the plume is assumed to be independent from the influence of other buoyant plumes. Here we provide new understanding of the spreading patterns of multiple plumes interacting along simplified coastal settings by investigating: (i) the relative likelihood of plume-to-plume interactions at different settings using geophysical scaling, (ii) the diversity of plume frontal collision types and the effects of these collisions on spreading patterns of plume waters using a two-dimensional hydrodynamic model, and (iii) the fundamental differences in plume spreading patterns between coasts with single and multiple rivers using a three-dimensional hydrodynamic model. Geophysical scaling suggests that coastal margins with numerous small rivers (watershed areas 100,000 km2). When two plume fronts meet, several types of collision attributes were found, including refection, subduction and occlusion. We found that the relative differences in pre-collision plume densities and thicknesses strongly influenced the resulting collision types. The three-dimensional spreading of buoyant plumes was found to be influenced by the presence of additional rivers for all modeled scenarios, including those with and without Coriolis and wind. Combined, these results suggest that plume-to-plume interactions are common phenomena for coastal regions offshore of the world's smaller rivers and for coastal settings with multiple river mouths in close proximity, and that the spreading and fate of river waters in these settings will be strongly influenced by these interactions. We conclude that new investigations are needed to characterize how plumes interact offshore of river mouths to better

  7. Sediment fluxes in transboundary Selenga river basin

    Science.gov (United States)

    Belozerova, Ekaterina

    2013-04-01

    Gathering reliable information on transboundary river systems remains a crucial task for international water management and environmental pollution control. Countries located in the lower parts of the river basins depend on water use and management strategies in adjacent upstream countries. One important issue in this context is sediment transport and associated contaminant fluxes across the state borders. The mass flows of dissolved ions, biogens, heavy metal concentrations, as far as suspended sediment concentration (SSC, mg/l) along upper Selenga river and its tributaries based on the literature review and results of field campaigns 2011-2012 were estimated. Based on the water discharges measurements Q, suspended load WR (t/day) and dissolved loads WL were calculated. In the Selenga basin the minimal WR (1,34-3,74 t/day) were found at small rivers. Maximal sediment loads (WR = 15 000 t/day) were found at the upper Orkhon river during flood event. The downstream point (Mongolia-Russia border) was characterized 2 220 t/day in 2011. Generally the prevalence of the accumulation is found through calculating sediment budget for all rivers (ΔW = WR (downstream) - WR (upstream) mining and pastures) increases the portion of clay particles in total sediment load (e.g. at the downstream point of most polluted Orkhon river it reached 207,8 t/day). The existed estimates are compared with distribution of the main matter sources within basin: mining and industry, river-bank erosion and slope wash. The heaviest increase of suspended and dissolved matter transport is indicated along Tuul-Orkhon river system (right tributary of the Selenga river where Mongolia capital Ulaanbaator, gold mine Zaamar and few other mines). The results provide evidence on a connection between increased heavy metal concentrations in water-sediment systems of transboundary rivers and pollutant source zones at industrial and mining centers, both as in-channel erosion and land use.

  8. River water quality modelling: II

    DEFF Research Database (Denmark)

    Shanahan, P.; Henze, Mogens; Koncsos, L.

    1998-01-01

    The U.S. EPA QUAL2E model is currently the standard for river water quality modelling. While QUAL2E is adequate for the regulatory situation for which it was developed (the U.S. wasteload allocation process), there is a need for a more comprehensive framework for research and teaching. Moreover......, and to achieve robust model calibration. Mass balance problems arise from failure to account for mass in the sediment as well as in the water column and due to the fundamental imprecision of BOD as a state variable. (C) 1998 IAWQ Published by Elsevier Science Ltd. All rights reserved....

  9. Fish diseases in coastal rivers

    Energy Technology Data Exchange (ETDEWEB)

    Moeller, H.

    1984-10-01

    Fish diseases have been used as pollution indicators in surface water for about 15 years. The complex interdependences between pathogens, fish, and a multitude of environmental parameters make data evaluation difficult and may lead to misinterpretations. The effects of the natural environment are found to be more important than pollutant effects. To give an example: In a number of fish species, disease rates were highest not in the strongly polluted stretch of river near Hamburg but in the estuarine region where pollutant concentrations are comparatively low but salt content fluctuations are high.

  10. Hydrogeological investigations of river bed clogging at a river bank filtration site along the River Warta, Poland

    Directory of Open Access Journals (Sweden)

    Przybyłek Jan

    2017-12-01

    Full Text Available River bank filtration (RBF is a system that enriches groundwater resources by induced infiltration of river water to an aquifer. Problematic during operation of RBF systems is the deterioration of infiltration effectiveness caused by river bed clogging. This situation was observed in the Krajkowo well field which supplies fresh water to the city of Poznań (Poland during and after the long hydrological drought between the years 1989 and 1992. The present note discusses results of specific hydrogeological research which included drilling of a net of boreholes to a depth of 10 m below river bottom (for sediment sampling as well as for hydrogeological measurements, analyses of grain size distribution and relative density studies. The results obtained have allowed the recognition of the origin of the clogging processes, as well as the documentation of the clogged parts of the river bottom designated for unclogging activities.

  11. Hydrogeological investigations of river bed clogging at a river bank filtration site along the River Warta, Poland

    Science.gov (United States)

    Przybyłek, Jan; Dragon, Krzysztof; Kaczmarek, Piotr Michał Jan

    2017-12-01

    River bank filtration (RBF) is a system that enriches groundwater resources by induced infiltration of river water to an aquifer. Problematic during operation of RBF systems is the deterioration of infiltration effectiveness caused by river bed clogging. This situation was observed in the Krajkowo well field which supplies fresh water to the city of Poznań (Poland) during and after the long hydrological drought between the years 1989 and 1992. The present note discusses results of specific hydrogeological research which included drilling of a net of boreholes to a depth of 10 m below river bottom (for sediment sampling as well as for hydrogeological measurements), analyses of grain size distribution and relative density studies. The results obtained have allowed the recognition of the origin of the clogging processes, as well as the documentation of the clogged parts of the river bottom designated for unclogging activities.

  12. Fish communities of rivers = Peuplements ichtyologiques des rivières

    OpenAIRE

    Welcomme, R.L.; Mérona,Bernard de

    1988-01-01

    En dépit de la grande extension du réseau lotique africain, son ichtyofaune est moins intensivement étudiée que celle des lacs et des réservoirs ... La caractéristique essentielle des rivières africaines est le rythme saisonnier des crues qui exerce une forte influence sur la biologie des poissons. Du point de vue des communautés ichtyologiques on note une grande richesse spécifique corrélée à la taille du bassin et une abondance de petites espèces au cycle court ... Il existe peu d'estimatio...

  13. River geomorphology and fish barriers affect on spatial and temporal patterns of fish assemblages in the Niobrara River, Nebraska

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The Niobrara River in northern Nebraska traverses the heart of the Great Plains with portions of the river protected under the National Wild and Scenic River system...

  14. The Vaal river catchment: Problems and research needs

    CSIR Research Space (South Africa)

    Braune, E

    1987-01-01

    Full Text Available . THE VAAL RIVER SYSTEM The V a a l River r i s e s on the western slopes of the Drakensberg escarpment and flows about 900 km west-south-west across the i n t e r io r plateau t o join the Orange River near Douglas (Figure 11. The major t r i b u t a... Allemanskraal Erf en is Bloemhof Vaalharts Spitskop Rustfontein Krugersdrif t Tierpoort Kalkfontein Douglas Weir V a a l River Nuwe jaarssprui t Vaal River Vaal River Mooi Renoster Sand Vet V a a l River Vaal River Harts Modder Modder...

  15. Balancing hydropower production and river bed incision in operating a run-of-river hydropower scheme along the River Po

    Science.gov (United States)

    Denaro, Simona; Dinh, Quang; Bizzi, Simone; Bernardi, Dario; Pavan, Sara; Castelletti, Andrea; Schippa, Leonardo; Soncini-Sessa, Rodolfo

    2013-04-01

    Water management through dams and reservoirs is worldwide necessary to support key human-related activities ranging from hydropower production to water allocation, and flood risk mitigation. Reservoir operations are commonly planned in order to maximize these objectives. However reservoirs strongly influence river geomorphic processes causing sediment deficit downstream, altering the flow regime, leading, often, to process of river bed incision: for instance the variations of river cross sections over few years can notably affect hydropower production, flood mitigation, water supply strategies and eco-hydrological processes of the freshwater ecosystem. The river Po (a major Italian river) has experienced severe bed incision in the last decades. For this reason infrastructure stability has been negatively affected, and capacity to derive water decreased, navigation, fishing and tourism are suffering economic damages, not to mention the impact on the environment. Our case study analyzes the management of Isola Serafini hydropower plant located on the main Po river course. The plant has a major impact to the geomorphic river processes downstream, affecting sediment supply, connectivity (stopping sediment upstream the dam) and transport capacity (altering the flow regime). Current operation policy aims at maximizing hydropower production neglecting the effects in term of geomorphic processes. A new improved policy should also consider controlling downstream river bed incision. The aim of this research is to find suitable modeling framework to identify an operating policy for Isola Serafini reservoir able to provide an optimal trade-off between these two conflicting objectives: hydropower production and river bed incision downstream. A multi-objective simulation-based optimization framework is adopted. The operating policy is parameterized as a piecewise linear function and the parameters optimized using an interactive response surface approach. Global and local

  16. Compromised Rivers: Understanding Historical Human Impacts on Rivers in the Context of Restoration

    Directory of Open Access Journals (Sweden)

    Ellen Wohl

    2005-12-01

    Full Text Available A river that preserves a simplified and attractive form may nevertheless have lost function. Loss of function in these rivers can occur because hydrologic and geomorphic processes no longer create and maintain the habitat and natural disturbance regimes necessary for ecosystem integrity. Recognition of compromised river function is particularly important in the context of river restoration, in which the public perception of a river's condition often drives the decision to undertake restoration as well as the decision about what type of restoration should be attempted. Determining the degree to which a river has been altered from its reference condition requires a knowledge of historical land use and the associated effects on rivers. Rivers of the Front Range of the Colorado Rocky Mountains in the United States are used to illustrate how historical land uses such as beaver trapping, placer mining, tie drives, flow regulation, and the construction of transportation corridors continue to affect contemporary river characteristics. Ignorance of regional land use and river history can lead to restoration that sets unrealistic goals because it is based on incorrect assumptions about a river's reference condition or about the influence of persistent land-use effects.

  17. Environmental flow for Monsoon Rivers in India: The Yamuna River as a case study

    CERN Document Server

    Soni, Vikram; Singh, Diwan

    2013-01-01

    We consider the flows of Monsoon Rivers in India that will permit the river to perform all its natural functions. About 80% of the total flow for Indian rivers is during the monsoon and the remaining 20% is during the non monsoon period. By carrying out a case study of the river Yamuna in Delhi we find that at least 50% of the virgin monsoon (July to September) flow is required for the transport of the full spectrum of soil particles in the river sediment. A similar flow is needed for adequate recharge of the floodplain aquifers along river. For the non monsoon period (October to June) about 60% of the virgin flow is necessary to avoid the growth of still water algae and to support river biodiversity.

  18. River meander modeling of the Wabash River near the Interstate 64 Bridge near Grayville, Illinois

    Science.gov (United States)

    Lant, Jeremiah G.; Boldt, Justin A.

    2018-01-16

    Natural river channels continually evolve and change shape over time. As a result, channel evolution or migration can cause problems for bridge structures that are fixed in the flood plain. A once-stable bridge structure that was uninfluenced by a river’s shape could be encroached upon by a migrating river channel. The potential effect of the actively meandering Wabash River on the Interstate 64 Bridge at the border with Indiana near Grayville, Illinois, was studied using a river migration model called RVR Meander. RVR Meander is a toolbox that can be used to model river channel meander migration with physically based bank erosion methods. This study assesses the Wabash River meandering processes through predictive modeling of natural meandering over the next 100 years, climate change effects through increased river flows, and bank protection measures near the Interstate 64 Bridge.

  19. Industrial pollution and the management of river water quality: a model of Kelani River, Sri Lanka.

    Science.gov (United States)

    Gunawardena, Asha; Wijeratne, E M S; White, Ben; Hailu, Atakelty; Pandit, Ram

    2017-08-19

    Water quality of the Kelani River has become a critical issue in Sri Lanka due to the high cost of maintaining drinking water standards and the market and non-market costs of deteriorating river ecosystem services. By integrating a catchment model with a river model of water quality, we developed a method to estimate the effect of pollution sources on ambient water quality. Using integrated model simulations, we estimate (1) the relative contribution from point (industrial and domestic) and non-point sources (river catchment) to river water quality and (2) pollutant transfer coefficients for zones along the lower section of the river. Transfer coefficients provide the basis for policy analyses in relation to the location of new industries and the setting of priorities for industrial pollution control. They also offer valuable information to design socially optimal economic policy to manage industrialized river catchments.

  20. Modelling morphodynamic evolution of river dunes

    NARCIS (Netherlands)

    Paarlberg, Andries; Dohmen-Janssen, Catarine M.; Hulscher, Suzanne J.M.H.; van den Berg, J.; Termes, A.P.P.; Ferreira, Rui M.L.

    2006-01-01

    River dunes influence the hydraulic roughness and water levels in rivers. Especially during floods the interplay between dunes and the flow field could become significant. Therefore, it is desired to forecast the dimensions of dunes during such extreme and unsteady flood events. At present it is not

  1. 33 CFR 117.263 - Banana River.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Banana River. 117.263 Section 117.263 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Florida § 117.263 Banana River. (a) The draw of the Mathers (SR...

  2. Savannah River Site Environmental Report for 1998

    Energy Technology Data Exchange (ETDEWEB)

    Arnett, M

    1999-06-09

    The mission at the Savannah River Site (SRS) is focused primarily on support of the national defense, nonproliferation, and environmental cleanup. SRS-through its prime operating contractor, Westinghouse Savannah River Company-continues to maintain a comprehensive environmental monitoring program.

  3. Experiments on sediment pulses in mountain rivers

    Science.gov (United States)

    Y. Cui; T. E. Lisle; J. E. Pizzuto; G. Parker

    1998-01-01

    Pulses of sediment can be introduced into mountain rivers from such mechanisms as debris flows, landslides and fans at tributary confluences. These processes can be natural or associated with the activities of humans, as in the case of a pulse created by sediment derived from timber harvest or the removal of a dam. How does the river digest these pulses?

  4. 33 CFR 117.971 - Neches River.

    Science.gov (United States)

    2010-07-01

    ... OPERATION REGULATIONS Specific Requirements Texas § 117.971 Neches River. (a) The draw of the Kansas City... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Neches River. 117.971 Section 117..., providing 13 feet of vertical clearance above mean high tide. This bridge will open on signal. (1) Mariners...

  5. 33 CFR 117.989 - Trinity River.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Trinity River. 117.989 Section 117.989 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Texas § 117.989 Trinity River. The draws of the Union...

  6. River System Behaviour Effects on Flood Risk

    NARCIS (Netherlands)

    Schweckendiek, T.; Vrouwenvelder, A.C.W.M.; Van Mierlo, M.C.L.M.; Calle, E.O.F.; Courage, W.M.G.

    2008-01-01

    A risk-based safety approach is indispensable to support decision-making on flood protection strategies and measures. Hitherto the effects of river system behaviour on flood risk have usually been neglected. River system behaviour refers to the fact that the flood risk (or safety) of a particular

  7. Advances in understanding river-groundwater interactions

    Science.gov (United States)

    Brunner, Philip; Therrien, René; Renard, Philippe; Simmons, Craig T.; Franssen, Harrie-Jan Hendricks

    2017-09-01

    River-groundwater interactions are at the core of a wide range of major contemporary challenges, including the provision of high-quality drinking water in sufficient quantities, the loss of biodiversity in river ecosystems, or the management of environmental flow regimes. This paper reviews state of the art approaches in characterizing and modeling river and groundwater interactions. Our review covers a wide range of approaches, including remote sensing to characterize the streambed, emerging methods to measure exchange fluxes between rivers and groundwater, and developments in several disciplines relevant to the river-groundwater interface. We discuss approaches for automated calibration, and real-time modeling, which improve the simulation and understanding of river-groundwater interactions. Although the integration of these various approaches and disciplines is advancing, major research gaps remain to be filled to allow more complete and quantitative integration across disciplines. New possibilities for generating realistic distributions of streambed properties, in combination with more data and novel data types, have great potential to improve our understanding and predictive capabilities for river-groundwater systems, especially in combination with the integrated simulation of the river and groundwater flow as well as calibration methods. Understanding the implications of different data types and resolution, the development of highly instrumented field sites, ongoing model development, and the ultimate integration of models and data are important future research areas. These developments are required to expand our current understanding to do justice to the complexity of natural systems.

  8. A concise history of Dutch river floods

    NARCIS (Netherlands)

    Tol, R.S.J.; Langen, A.

    2000-01-01

    Based on a brief account of 1,000 years of river floods and flood management in the Dutch Rhine delta, it is argued that vulnerability to river floods depends on the complex interaction of economics, institutions, politics and, to a limited extent, climate. Response functions and thresholds for

  9. Thinking big: linking rivers to landscapes

    Science.gov (United States)

    Joan O’Callaghan; Ashley E. Steel; Kelly M. Burnett

    2012-01-01

    Exploring relationships between landscape characteristics and rivers is an emerging field, enabled by the proliferation of satellite date, advances in statistical analysis, and increased emphasis on large-scale monitoring. Landscapes features such as road networks, underlying geology, and human developments, determine the characteristics of the rivers flowing through...

  10. 33 CFR 117.385 - Snake River.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Snake River. 117.385 Section 117.385 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Idaho § 117.385 Snake River. The drawspan of the U.S. 12 bridge...

  11. Gila River Basin Native Fishes Conservation Program

    Science.gov (United States)

    Doug Duncan; Robert W. Clarkson

    2013-01-01

    The Gila River Basin Native Fishes Conservation Program was established to conserve native fishes and manage against nonnative fishes in response to several Endangered Species Act biological opinions between the Bureau of Reclamation and the U.S. Fish and Wildlife Service on Central Arizona Project (CAP) water transfers to the Gila River basin. Populations of some Gila...

  12. Volatilization of Benzene in a River

    Directory of Open Access Journals (Sweden)

    Eric Dunlop

    2013-01-01

    Full Text Available Benzene is a volatile organic compound: when it contaminates a river, some of the substance will evaporate as it flows through. We examine the volumetric flow rate to find how volatilization affects the concentration levels of benzene as the substance flows through several consecutive sections of a river, using a specific example to illustrate the general method.

  13. The Nile River and the Riparian States

    African Journals Online (AJOL)

    An acceptable legal regime to manage the Nile River and its drainage system for equitable intra-and inter- state econo-political and socio-cultural utilisation remains a major challenge. For many decades after independence, particularly since the 1980s, the Nile River riparian states have engaged in numerous bilateral and ...

  14. 33 CFR 117.803 - Niagara River.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Niagara River. 117.803 Section 117.803 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements New York § 117.803 Niagara River. The draw of the...

  15. Implementing Integrated River Basin Management in China

    NARCIS (Netherlands)

    Boekhorst, D.G.J. te; Smits, A.J.M.; Yu, X.; Lifeng, L.; Lei, G.; Zhang, C.

    2010-01-01

    This paper examines the role of the World Wildlife Fund for Nature China as policy entrepreneur in China. It illustrates the ways in which the World Wildlife Fund for Nature is active in promoting integrated river basin management in the Yangtze River basin and how the efforts at basin level are

  16. 33 CFR 117.417 - Ohio River.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Ohio River. 117.417 Section 117.417 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Kentucky § 117.417 Ohio River. The draw of the Southern Railway...

  17. Vocal behaviour of Orange River Francolin Scleroptila ...

    African Journals Online (AJOL)

    ... the size of the population. A 'ke-ri ke-chi' playback call enticed three different calls from Orange River Francolins that can be used for management purposes, including the 'ke-ri ke-chi', cacophony and female calls. These three calls can be used to locate Orange River Francolins, determine dispersion, habitat preferences, ...

  18. South Fork Holston River basin 1988 biomonitoring

    Energy Technology Data Exchange (ETDEWEB)

    Saylor, C.F.; Ahlstedt, S.A.

    1990-06-01

    There is concern over the effects of shifts in land use use practices on the aquatic fauna of streams in the South Fork Holston River basin in northwestern North Carolina and southwestern Virginia. Trout reproduction has noticeably declined in the Watauga River subbasin. The Watauga River and Elk River subbasins have been subjected to commercial and resort development. The Middle fork Holston River and the upper South Fork Holston River subbasins have been affected by agricultural and mining activities, respectively (Cox, 1986). To aid reclamation and management of the South Fork Holston basin, Tennessee Valley Authority (TVA) biologists conducted biomonitoring--including index of biotic integrity and macroinvertebrate sampling--on the Middle Fork Holston, South Fork Holston, Watauga, and Elk Rivers to assess cumulative impairment related to changes in habitat and pollutant loading in these subbasins. Biomonitoring can detect environmental degradation, help document problem areas, and assist in development of strategies for managing water quality. This report discusses the methods and materials and results of the biomonitoring of South Fork Holston River Basin. 13 refs., 5 figs., 12 tabs.

  19. Sea Otter, River Otter. The Wonder Series.

    Science.gov (United States)

    Robinson, Sandra Chisholm

    This curriculum guide is all about otters and provides information on both sea and river otters. Included are activities related to the diet of sea otters, the adaptations sea otters have made to live in the sea, their tool-using abilities, where they live and how to spot them, comparative anatomy of sea and river otters, and otter movement. The…

  20. 33 CFR 117.139 - White River.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false White River. 117.139 Section 117.139 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements Arkansas § 117.139 White River. (a) The draws of the St. Louis...

  1. Excessive nitrogen and phosphorus in European rivers

    NARCIS (Netherlands)

    Blaas, Harry; Kroeze, Carolien

    2016-01-01

    Rivers export nutrients to coastal waters. Excess nutrient export may result in harmful algal blooms and hypoxia, affecting biodiversity, fisheries, and recreation. The purpose of this study is to quantify for European rivers (1) the extent to which N and P loads exceed levels that minimize the

  2. Conservation status of Colorado River cutthroat trout

    Science.gov (United States)

    Michael K. Young; R. Nick Schmal; Thomas W. Kohley; Victoria G. Leonard

    1996-01-01

    Though biologists recognize that populations of Colorado River cutthroat trout have declined, the magnitude of the loss remains unquantified. We obtained information from state and federal biologists and from state databases to determine the current distribution and status of populations of Colorado River cutthroat trout. Recent population extinctions have been...

  3. Thermal Evolution of Crude Oils in Sedimentary Basins: Experimental Simulation in a Confined System and Kinetic Modeling Evolution thermique des huiles dans les bassins sédimentaires : simulation expérimentale par pyrolyse en milieu confiné et modélisation cinétique

    Directory of Open Access Journals (Sweden)

    Behar F.

    2006-11-01

    coefficients alphaij were optimized with reference to a dataset comprising the final compositions resulting from oil pyrolysis experiments. This optimization was carried out successively on each distillate and each residue, on both distillate and residue from the same oil, then on the two distillates and two residues altogether. The model accounts satisfactorily for the specific kinetics of cracking of both each oil and of the two oils together, suggesting that it is now possible to predict the thermal behavior of a given oil provided the proportions of the ten fractions selected for the model are known. The wide temperature range in which the model is valid, supports its extrapolation to the temperature range of sedimentary basins. Une meilleure connaissance des mécanismes du craquage thermique des huiles doit permettre de mieux comprendre leur évolution naturelle dans les bassins sédimentaires et donc d'améliorer les modèles actuels utilisés pour prédire la formation du gaz. Bien que les mécanismes de craquage soient bien connus pour des composés modèles ou des mélanges simples d'hydrocarbures, il n'existe pas à l'heure actuelle, à l'exception des modèles empiriques, de méthode pour rendre compte de la dégradation thermique des mélanges complexes, surtout, lorsque ces derniers sont enrichis en produits lourds. Au cours du craquage thermique, une huile produira à la fois des composés plus légers et des composés plus lourds que la charge initiale. En conséquence, les produits de pyrolyse seront un mélange complexe contenant des produits nouveaux et des composés non encore dégradés. Afin de pouvoir faire la distinction entre réactifs et produits, nous avons choisi de fractionner chaque huile en deux grandes fractions : la première (distillat 300- contenant des hydrocarbures légers de C6 à C16 et la seconde (résidu 300+ contenant des hydrocarbures et des produits polaires. Afin de simuler l'évolution thermique des huiles, nous avons réalisé une

  4. First Modelling Results of the EM Response of a CO2 Storage in the Paris Basin Premières modélisations de la réponse EM d’un stockage de CO2 dans le bassin Parisien

    Directory of Open Access Journals (Sweden)

    Bourgeois B.

    2010-07-01

    electriques/EM pour surveiller l’injection de CO2 supercritique a 1700 m de profondeur dans un aquifere salin du Bassin Parisien (Carbonates du Dogger. Nous demontrons d’abord l’interet theorique des methodes de resistivite pour une telle surveillance a l’aide des lois fondamentales de la petrophysique dans les roches sedimentaires poreuses, en supposant que le CO2 supercritique est un isolant parfait. Diverses combinaisons de sources et de capteurs sont discutees et il est conclu que le dispositif le plus performant consiste en une source de type galvanique (injection de courant dans le sol a l’aide d’unepaire d’electrodes A et B et d’une grille de capteurs electriques (et peut-etre magnetiques a la surface du sol. Compte tenu de la profondeur et de la finesse des couches reservoir, l’injection du courant en profondeur est envisagee dans le but d’augmenter la densite de courant circulant dans la couche reservoir. L’injection ponctuelle a la profondeur du reservoir, dans une configuration de type « Mise A la Masse » (MAM, etant generalement impossible a cause de la presence de tubages metalliques dans les forages, nous avons etudie la possibilite d’utiliser ces memes tubages comme des longues electrodes distribuant le courant tout le long du forage. Ce type de source est denomme « LEMAM » (Long Electrode Mise A la Masse, pour le distinguer du MAM conventionnel. Des simulations numeriques sont presentees a la fois pour le dispositif LEMAM et pour le dispositif « rectangle » (RECT, lequel emploie une injection de courant ponctuelle a la surface du sol. Le modele geoelectrique utilise est base sur une zone proche du champ petrolier de Saint-Martin-de-Bossenay (SMB, au sud-est du Bassin Parisien. La couche reservoir consideree dans cette etude est la formation de l’“ Oolithe Blanche ” (Dogger qui a une epaisseur de 75 m et se situe a une profondeur de 1700 m sous la surface du sol. Dans les modeles presentes, le panache de CO2 est simplifie en

  5. Preface to the volume Large Rivers

    Science.gov (United States)

    Latrubesse, Edgardo M.; Abad, Jorge D.

    2018-02-01

    The study and knowledge of the geomorphology of large rivers increased significantly during the last years and the factors that triggered these advances are multiple. On one hand, modern technologies became more accessible and their disseminated usage allowed the collection of data from large rivers as never seen before. The generalized use of high tech data collection with geophysics equipment such as acoustic Doppler current profilers-ADCPs, multibeam echosounders, plus the availability of geospatial and computational tools for morphodynamics, hydrological and hydrosedimentological modeling, have accelerated the scientific production on the geomorphology of large rivers at a global scale. Despite the advances, there is yet a lot of work ahead. Good parts of the large rivers are in the tropics and many are still unexplored. The tropics also hold crucial fluvial basins that concentrate good part of the gross domestic product of large countries like the Parana River in Argentina and Brazil, the Ganges-Brahmaputra in India, the Indus River in Pakistan, and the Mekong River in several countries of South East Asia. The environmental importance of tropical rivers is also outstanding. They hold the highest biodiversity of fluvial fauna and alluvial vegetation and many of them, particularly those in Southeast Asia, are among the most hazardous systems for floods in the entire world. Tropical rivers draining mountain chains such as the Himalaya, the Andes and insular Southeast Asia are also among the most heavily sediment loaded rivers and play a key role in both the storage of sediment at continental scale and the transference of sediments from the continent to the Ocean at planetary scale (Andermann et al., 2012; Latrubesse and Restrepo, 2014; Milliman and Syvitski, 1992; Milliman and Farsnworth, 2011; Sinha and Friend, 1994).

  6. Trends in the occurrence of human and veterinary antibiotics in the sediments of the Yellow River, Hai River and Liao River in northern China

    Energy Technology Data Exchange (ETDEWEB)

    Zhou Lijun [State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640 (China); Ying Guangguo, E-mail: guang-guo.ying@gig.ac.cn [State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640 (China); Zhao Jianliang [State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640 (China); Yang Jifeng [State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640 (China); Chemistry and Chemical Engineering Department, Hunan University of Arts and Science, Changde 415000 (China); Wang Li; Yang Bin; Liu Shan [State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640 (China)

    2011-07-15

    The occurrence of four classes of 17 commonly used antibiotics (including fluoroquinolones, tetracycline, sulfonamides, and macrolides) was investigated in the sediments of the Yellow River, Hai River and Liao River in northern China by using rapid resolution liquid chromatography-tandem mass spectrometry. Higher concentrations were detected for most antibiotics in the sediments of the Hai River than in the sediments of the other rivers. Norfloxacin, ofloxacin, ciprofloxacin and oxytetracycline in the three rivers were most frequently detected with concentrations up to 5770, 1290, 653 and 652 ng/g, respectively. High frequencies and concentrations of the detected antibiotics were often found in the downstream of large cities and areas influenced by feedlot and fish ponds. Good fitted linear regression equations between antibiotic concentration and sediment physicochemical properties (TOC, texture and pH) were also found, indicating that sediment properties are important factors influencing the distribution of antibiotics in the sediment of rivers. - Highlights: > Presence of four classes of commonly used antibiotics in the river sediments. > Higher concentrations in the Hai River than in the Liao River and Yellow River. > Norfloxacin, ofloxacin, ciprofloxacin and oxytetracycline most frequently detected. > High antibiotic concentrations often found in the downstream of large cities. > River sediments are an important reservoir of antibiotics. - Higher concentrations of selected antibiotics were determined in the sediments of the Hai River than in the Liao River and Yellow River.

  7. Ichthyoplankton entrainment study at the SRS Savannah River water intakes for Westinghouse Savannah River Company

    Energy Technology Data Exchange (ETDEWEB)

    Paller, M. (Westinghouse Savannah River Co., Aiken, SC (United States))

    1992-03-26

    Cooling water for L and K Reactors and makeup water for Par Pond is pumped from the Savannah River at the 1G, 3G, and 5G pump houses. Ichthyoplankton (drifting fish larvae and eggs) from the river are entrained into the reactor cooling systems with the river water and passed through the reactor's heat exchangers where temperatures may reach 70[degrees]C during full power operation. Ichthyoplankton mortality under such conditions is assumed to be 100 percent. The number of ichthyoplankton entrained into the cooling system depends on a variety of variables, including time of year, density and distribution of ichthyoplankton in the river, discharge levels in the river, and the volume of water withdrawn by the pumps. Entrainment at the 1 G pump house, which is immediately downstream from the confluence of Upper Three Runs Creek and the Savannah River, is also influenced by discharge rates and ichthyoplankton densities in Upper Three Runs Creek. Because of the anticipated restart of several SRS reactors and the growing concern surrounding striped bass and American shad stocks in the Savannah River, the Department of Energy requested that the Environmental Sciences Section (ESS) of the Savannah River Laboratory sample ichthyoplankton at the SRS Savannah River intakes. Dams Moore, Inc., under a contract with Westinghouse Savannah River Company performed the sampling and data analysis for the ESS.

  8. River-tide dynamics: Exploration of nonstationary and nonlinear tidal behavior in the Yangtze River estuary

    Science.gov (United States)

    Guo, Leicheng; van der Wegen, Mick; Jay, David A.; Matte, Pascal; Wang, Zheng Bing; Roelvink, Dano; He, Qing

    2015-05-01

    River-tide dynamics remain poorly understood, in part because conventional harmonic analysis (HA) does not cope effectively with nonstationary signals. To explore nonstationary behavior of river tides and the modulation effects of river discharge, this work analyzes tidal signals in the Yangtze River estuary using both HA in a nonstationary mode and continuous wavelet transforms (CWT). The Yangtze is an excellent natural laboratory to analyze river tides because of its high and variable flow, its length, and the fact that there are do dams or reflecting barriers within the tidal part of the system. Analysis of tidal frequencies by CWT and analysis of subtidal water level and tidal ranges reveal a broad range of subtidal variations over fortnightly, monthly, semiannual, and annual frequencies driven by subtidal variations in friction and by variable river discharges. We employ HA in a nonstationary mode (NSHA) by segregating data within defined flow ranges into separate analyses. NSHA quantifies the decay of the principal tides and the modulation of M4 tide with increasing river discharges. M4 amplitudes decrease far upriver (landward portion of the estuary) and conversely increase close to the ocean as river discharge increases. The fortnightly frequencies reach an amplitude maximum upriver of that for over tide frequencies, due to the longer wavelength of the fortnightly constituents. These methods and findings should be applicable to large tidal rivers globally and have broad implications regarding management of navigation channels and ecosystems in tidal rivers.

  9. Operational river ice forecasting on the Peace River : managing flood risk and hydropower production

    Energy Technology Data Exchange (ETDEWEB)

    Jasek, M. [BC Hydro, Burnaby, BC (Canada); Friensenhan, E. [Alberta Environment, Edmonton, AB (Canada); Granson, W. [Alberta Environment, Peace River, AB (Canada)

    2007-07-01

    This paper described the procedures used jointly by Alberta Environment and BC Hydro to manage the water flows on the Peace River. The Alberta-British Columbia Joint Task Force on Peace River Ice (JTF) was concerned with the coordination of break-up ice observations along the river as well as ice jam flooding at the Town of Peace River (TPR), resulting from an induced dynamic break-up on the Smoky River, a main tributary of the Peace River. The TPR is the largest community that can be most affected by ice jams on river. As such, river ice processes on the river are monitored and subject to operational procedures of the JTF. These operating procedures are organized into 3 separate sequential phases, notably freeze-up procedures, mid-winter procedures, and break-up procedures. In April 2007, the ice break-up season on the Peace River and Smoky River, was particularly challenging as record high snow cover led to a dynamic break-up of these two streams. Costs due to reduced hydropower production were documented. This paper highlighted the main decision points for mitigation and presented the recommendations that improve mitigation efforts with benefits to both the flood prone community and the power utility. This paper revealed that forecasting the start of control flow by predicting the arrival of the ice front using the Comprehensive River Ice Simulation System Project (CRISSP) model was largely successful. Further work is underway to define the accuracy of forecasting the start of control flow using CRISSP, as accuracy of temperature forecasts appears to be the major uncertainty. The JTF was able to make successful recommendations for flow reductions. However, the need for an accurate hydrologic model for the Smoky River as well as other inflows between Peace Canyon and the TPR was emphasized. 4 refs., 31 figs.

  10. Biodiversite et structure des macroinvertebres benthiques du bassin ...

    African Journals Online (AJOL)

    From our study, 26 families of benthic macro invertebrates have been identified from 686 individuals harvested. The taxonomic composition of samples analyzed revealed that 65 % of macroinvertebrates registered are Insects, 19 % mollusks and 8% oligochaeta. In Insect group, the heteroptera was best represented with ...

  11. Irriguer dans le bassin du Rhône

    Directory of Open Access Journals (Sweden)

    Florence Richard-Schott

    2012-12-01

    Full Text Available La question des ressources en eau constitue l’une des plus angoissantes questions de notre temps. Manquons-nous d’eau, manquerons-nous d’eau un jour? Cette inquiétude est récurrente dans les régions sèches de la planète, et depuis quelques années, elle tend même à le devenir dans des régions tempérées réputées «humides». La menace d’une pénurie d’eau, réelle ou présumée, est d’autant plus sensible qu’un changement climatique semble bel et bien se dessiner. Certains épisodes récents ont eu un fort impact sur les populations qui craignent, entre autres, une accélération — non plus seulement saisonnière, mais permanente et définitive — des crises liées au manque d’eau. Les sécheresses de 1976 et de 2003 ont particulièrement marqué les esprits. Désormais, l’eau n’apparaît plus comme une richesse naturelle illimitée que l’homme peut ponctionner à son gré, mais bien comme une ressource rare et fragile qu’il doit au contraire partager et préserver.

  12. Fractures du bassin de l'adulte :Aspects epidemiologique ...

    African Journals Online (AJOL)

    Purpose of the study: Pelvis factures are in augmentation since few years because of the increase of cars park. The aim of this study was to study the epidemiology, diagnosis and treatment aspects of the pelvis fractures. Materials and methods: It is a retrospective study hold from January 1990 to December 1999 (10 years).

  13. Adaptation aux changements climatiques des bassins versants en ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Une simulation Web participative sera employée pour acquérir des connaissances sur ces répercussions. Les résultats de recherche seront diffusés dans des publications ... Outputs. Papers. Water management in the Arkavathy basin : a situational analysis. Journal articles. Climate vulnerability and adaptation of water ...

  14. Ressources hydriques du bassin synclinal d'Essaouira (Maroc)

    National Research Council Canada - National Science Library

    Youbi, N; Jalal, M; Mennani, A; Bahir, M

    2000-01-01

    ... acuíferos del Turoniense y Plio-Cuaternario de la zona sinclinal de Essaouira. El principal río que atraviesa esta cuenca es el denominado Igrounzar (en la zona frontal) y Ksob (en la zona trasera). Es...

  15. Ressources hydriques du bassin synclinal d'Essaouira (Maroc)

    OpenAIRE

    Youbi, N.; Jalal, M.; Mennani, A.; Bahir, M.

    2000-01-01

    Not available.La cuenca sinclinal de Essaouira está constituida por un conjunto de unidades sinclinales, siendo las principales la de Bouabout (en la zona frontal) y la de Essaouira (en la zona trasera). Estas unidades contienen las reservas de agua más importantes de la región que se encuentran en el acuífero Cenomaniense-Turoniense de Bouabout y en los acuíferos del Turoniense y Plio-Cuaternario de la zona sinclinal de Essaouira. El principal río que atraviesa ...

  16. Ressources hydriques du bassin synclinal d'Essaouira (Maroc

    Directory of Open Access Journals (Sweden)

    Youbi, N.

    2000-08-01

    Full Text Available Not available.La cuenca sinclinal de Essaouira está constituida por un conjunto de unidades sinclinales, siendo las principales la de Bouabout (en la zona frontal y la de Essaouira (en la zona trasera. Estas unidades contienen las reservas de agua más importantes de la región que se encuentran en el acuífero Cenomaniense-Turoniense de Bouabout y en los acuíferos del Turoniense y Plio-Cuaternario de la zona sinclinal de Essaouira. El principal río que atraviesa esta cuenca es el denominado Igrounzar (en la zona frontal y Ksob (en la zona trasera. Es un río perenne gracias a las fuentes Cenomanienses-Turonienses de la zona frontal. Más del 50 % del volumen de agua de este río fluye entre los meses de noviembre y enero. Medidas de aforo diferenciales efectuadas a lo largo del ciclo hidrológico 1990-1991 (Fekri, 1993 demuestran que el Oued Ksob alimenta los acuíferos Plio-Cuaternarios y turoniense por flujos de 42 l/s y 64 l/s, respectivamente. El estudio hidrogeológico de los acuíferos de esta cuenca muestra que las aguas subterráneas fluyen del SE hacia el noroeste en el acuífero Plio-Cuaternario, y hacia el noroeste, el noreste y el oeste a nivel del acuífero Cenomaniense-Turoniense. El estudio hidroquímico permite identificar el origen de las mineralizaciones de las aguas, sus facies y sus calidades. La hidrología isotópica permite estimar las áreas de recarga de los acuíferos y sus interacciones, y definir las relaciones entre las dos unidades que constituyen la cuenca. También muestra que la recarga de los acuíferos por las lluvias eficaces se produce sin una notable evaporación.

  17. Adaptation aux changements climatiques des bassins versants en ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Les changements climatiques risquent d'accentuer la variabilité du climat, aggravant le stress hydrique, en particulier pour les groupes marginalisés. ... Le 11 août 2017, des chercheurs et des praticiens se sont réunis à Montréal dans le cadre de la conférence d'une journée intitulée The Global Need for Formal Child Care.

  18. Adaptation aux changements climatiques dans le bassin versant de ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Impactos Del Cambio Climático En Comunidades Andinas Bolivianas Dependientes De Glaciares Tropicales. Studies. Impact of Climate Change in Andean Bolivian Communities that Depend from Tropical Glaciers. Studies. Derecho Al Agua Para la Vida Agua Sustentable: Estado, avances y desafios del agua en Bolivia ...

  19. PRODUCTION HALIEUTIQUE DU LAC FAE (BASSIN DU SAN ...

    African Journals Online (AJOL)

    Pour ces tests, les 3 grandes saisons climatiques couvertes au ... reptiles aquatiques (crocodiles, python et varan) qui ne constituent pas ..... la saison etudiee (p < 0,05). Le test de. Duncan montre que cette production a fluctue significativement d'un secteur de peche a l'autre. Agronom1e Africaine 20 (3) : 313 - 329 (2008) ...

  20. Adaptation aux changements climatiques dans le bassin versant de ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Impactos Del Cambio Climático En Comunidades Andinas Bolivianas Dependientes De Glaciares Tropicales. Études. Impact of Climate Change in Andean Bolivian Communities that Depend from Tropical Glaciers. Études. Derecho Al Agua Para la Vida Agua Sustentable: Estado, avances y desafios del agua en Bolivia ...

  1. Similarities between rivers and submarine channels

    Science.gov (United States)

    Balcerak, Ernie

    2013-02-01

    Scientists have long known that the width and depth of rivers follows a power law relationship with discharge. They have also noticed that submarine channels appear to be similar to terrestrial rivers, but there have not been many systematic comparisons of the relationships between submarine channel morphology and discharge. Konsoer et al. compared the width, depth, and slope of 177 submarine channels to those of 231 river cross sections. They found that submarine channels are up to an order of magnitude wider and deeper than the largest terrestrial rivers, but they exhibit a similar power law relationship between width and depth. For submarine channels that were similar in size to rivers, the authors found that submarine channels tend to be 1 to 2 orders of magnitude steeper than rivers. The authors also inferred values for sediment concentration in the turbidity currents in the channels and combined this with estimated mean flow velocities to look for a relationship between discharge and morphology in the channels. They found that like rivers, the width and depth of the submarine channels follow a power law scaling with discharge. (Journal of Geophysical Research-Earth Surface, doi:10.1029/2012JF002422, 2013)

  2. River Basin Standards Interoperability Pilot

    Science.gov (United States)

    Pesquer, Lluís; Masó, Joan; Stasch, Christoph

    2016-04-01

    There is a lot of water information and tools in Europe to be applied in the river basin management but fragmentation and a lack of coordination between countries still exists. The European Commission and the member states have financed several research and innovation projects in support of the Water Framework Directive. Only a few of them are using the recently emerging hydrological standards, such as the OGC WaterML 2.0. WaterInnEU is a Horizon 2020 project focused on creating a marketplace to enhance the exploitation of EU funded ICT models, tools, protocols and policy briefs related to water and to establish suitable conditions for new market opportunities based on these offerings. One of WaterInnEU's main goals is to assess the level of standardization and interoperability of these outcomes as a mechanism to integrate ICT-based tools, incorporate open data platforms and generate a palette of interchangeable components that are able to use the water data emerging from the recently proposed open data sharing processes and data models stimulated by initiatives such as the INSPIRE directive. As part of the standardization and interoperability activities in the project, the authors are designing an experiment (RIBASE, the present work) to demonstrate how current ICT-based tools and water data can work in combination with geospatial web services in the Scheldt river basin. The main structure of this experiment, that is the core of the present work, is composed by the following steps: - Extraction of information from river gauges data in OGC WaterML 2.0 format using SOS services (preferably compliant to the OGC SOS 2.0 Hydrology Profile Best Practice). - Model floods using a WPS 2.0, WaterML 2.0 data and weather forecast models as input. - Evaluation of the applicability of Sensor Notification Services in water emergencies. - Open distribution of the input and output data as OGC web services WaterML, / WCS / WFS and with visualization utilities: WMS. The architecture

  3. River Data Package for Hanford Assessments

    Energy Technology Data Exchange (ETDEWEB)

    Rakowski, Cynthia L.; Guensch, Gregory R.; Patton, Gregory W.

    2006-08-01

    This data package documents the technical basis for selecting physical and hydraulic parameters and input values that will be used in river modeling for Hanford assessments. This work was originally conducted as part of the Characterization of Systems Task of the Groundwater Remediation Project managed by Fluor Hanford, Inc. and revised as part of the Characterization of Systems Project managed by PNNL for DOE. The river data package provides calculations of flow and transport in the Columbia River system. The module is based on the legacy code for the Modular Aquatic Simulation System II (MASS2), which is a two-dimensional, depth-averaged model that provides the capability to simulate the lateral (bank-to-bank) variation of flow and contaminants. It simulates river hydrodynamics (water velocities and surface elevations), sediment transport, contaminant transport, biotic transport, and sediment-contaminant interaction, including both suspended sediments and bed sediments. This document presents the data assembled to run the river module components for the section of the Columbia River from Vernita Bridge to the confluence with the Yakima River. MASS2 requires data on the river flow rate, downstream water surface elevation, groundwater influx and contaminants flux, background concentrations of contaminants, channel bathymetry, and the bed and suspended sediment properties. Stochastic variability for some input parameters such as partition coefficient (kd) values and background radionuclide concentrations is generated by the Environmental Stochastic Preprocessor. River flow is randomized on a yearly basis. At this time, the conceptual model does not incorporate extreme flooding (for example, 50 to 100 years) or dam removal scenarios.

  4. Visualization of Flow Alternatives, Lower Missouri River

    Science.gov (United States)

    Jacobson, Robert B.; Heuser, Jeanne

    2002-01-01

    Background The U.S. Army Corps of Engineers (COE) 'Missouri River Master Water Control Manual' (Master Manual) review has resulted in consideration of many flow alternatives for managing the water in the river (COE, 2001; 1998a). The purpose of this report is to present flow-management alternative model results in a way that can be easily visualized and understood. This report was updated in October 2001 to focus on the specific flow-management alternatives presented by the COE in the 'Master Manual Revised Draft Environmental Impact Statement' (RDEIS; COE, 2001). The original version (February 2000) is available by clicking here. The COE, U.S. Fish and Wildlife Service (FWS), Missouri River states, and Missouri River basin tribes have been participating in discussions concerning water management of the Missouri River mainstem reservoir system (MRMRS), the Missouri River Bank Stabilization and Navigation Project, and the Kansas River reservoir system since 1986. These discussions include general input to the revision of the Master Manual as well as formal consultation under Section 7 of the Endangered Species Act. In 2000, the FWS issued a Biological Opinion that prescribed changes to reservoir management on the Missouri River that were believed to be necessary to preclude jeopardy to three endangered species, the pallid sturgeon, piping plover, and interior least tern (USFWS, 2000). The combined Missouri River system is large and complex, including many reservoirs, control structures, and free-flowing reaches extending over a broad region. The ability to assess future impacts of altered management scenarios necessarily involves complex, computational models that attempt to integrate physical, chemical, biological, and economic effects. Graphical visualization of the model output is intended to improve understanding of the differences among flow-management alternatives.

  5. An assessment of water quality of Angaw River in Southeastern ...

    African Journals Online (AJOL)

    Physico-chemical and bacteriological water quality of the Angaw river were investigated at three different locations on the river. A range of water quality variables were measured in the river over a period of 12 months. The river was characterized by high ionic content. Relatively higher levels of ionic constituents occurred at ...

  6. 18 CFR 725.7 - Regional or river basin planning.

    Science.gov (United States)

    2010-04-01

    ... Responsibilities § 725.7 Regional or river basin planning. (a) In agreements between river basin commissions or other regional planning sponsors and the Council for the preparation and revision of regional and river... representing the river basin commission or regional planning sponsor shall certify to the Council that the...

  7. 27 CFR 9.208 - Snake River Valley.

    Science.gov (United States)

    2010-04-01

    ... 27 Alcohol, Tobacco Products and Firearms 1 2010-04-01 2010-04-01 false Snake River Valley. 9.208... Snake River Valley. (a) Name. The name of the viticultural area described in this section is “Snake River Valley”. For purposes of part 4 of this chapter, “Snake River Valley” is a term of viticultural...

  8. Water quality of the Modder River, South Africa | Koning | African ...

    African Journals Online (AJOL)

    The Modder River is a relatively small river in the central region of the Free State Province, South Africa and has a mean annual runoff of 184 x 106m3. Botshabelo is a city, which has developed in the catchment area of the river, and its sewage outflows are discharged into the Klein Modder, a tributary of the Modder River.

  9. 76 FR 7837 - Big Rivers Electric Corporation; Notice of Filing

    Science.gov (United States)

    2011-02-11

    ... December 1, 2010, the date that Big Rivers integrated its transmission facilities with the Midwest... Energy Regulatory Commission Big Rivers Electric Corporation; Notice of Filing Take notice that on February 4, 2011, Big Rivers Electric Corporation (Big Rivers) filed a notice of cancellation of its Second...

  10. 27 CFR 9.78 - Ohio River Valley.

    Science.gov (United States)

    2010-04-01

    ... 27 Alcohol, Tobacco Products and Firearms 1 2010-04-01 2010-04-01 false Ohio River Valley. 9.78... River Valley. (a) Name. The name of the viticultural area described in this section is “Ohio River Valley.” (b) Approved maps. The approved maps for determining the boundary of the Ohio River Valley...

  11. Hydraulics and morphology of mountain rivers; literature survey

    NARCIS (Netherlands)

    Sieben, J.

    1993-01-01

    Present knowledge on fluvial processes in mountain rivers should be expanded to enable the development of projects dealing with mountain rivers or mountain-river catchment areas. This study reviews research on hydraulic and morphological features of mountain rivers. A major characteristic of

  12. Projected future runoff of the Breede River under climate change ...

    African Journals Online (AJOL)

    The Breede River is the largest river in the Western Cape Province of South Africa, and as such, is a key resource for a variety of activities within the region. It is this significance of the river that prompted a study into the impact of climate change on future runoff in the river and hence, the potential impacts a projected change ...

  13. Radon in water of Shu river valley

    Directory of Open Access Journals (Sweden)

    Yelena Kuyanova

    2012-03-01

    Full Text Available The values of radon and its daughter products in water of Shu River valley have been received, using liquid scintillation spectrometry. The radon concentration naturally increases in investigated water samples downstream the Shu River, reaching the maximum value in the Tashutkolsky basin. The radon and its daughter products in a human body of 15 % are in soft tissues have been calculated by a mathematical modeling method. The annual dose from radon and its daughter products calculated by a mathematical modeling method received by the residents living in Shu river valley is 0,03 mSv/year.

  14. Geodetic monitoring of suspended particles in rivers

    Science.gov (United States)

    Kamnik, Rok; Maksimova, Daria; Kovačič, Boštjan

    2017-10-01

    There is a trend in modern approach to the management of space of collecting the spatial data, in order to obtain useful information. In this paper a research of suspended particles in the river Drava and Mura will be introduced. The goal is to connect different fields of water management in countries where the rivers Drava and Mura flows in purpose of water management sustainability. The methods such as GNSS for mapping cross sections of the river, the use of ADCP (Acoustic Doppler Current Profiler) measurement system and water sampling to monitor sediment in the water will be presented.

  15. Microbial cyanide sensor for monitoring river water.

    Science.gov (United States)

    Ikebukuro, K; Miyata, A; Cho, S J; Nomura, Y; Chang, S M; Yamauchi, Y; Hasebe, Y; Uchiyama, S; Karube, I

    1996-07-18

    A microbial cyanide sensor using Saccharomyces cerevisiae for monitoring a river water is described. This sensor is based on the inhibition of S. cerevisiae's respiration by cyanide. This sensor is a reactor type flow system and composed of two oxygen electrodes and a reactor which contains S. cerevisiae immobilized beads. The S. cerevisiae's respiration activity is measured using the oxygen electrodes. The sensor showed a linear response in the range from 0 to 15 microM and maintained stable response for 9 days at ambient temperature. The sensor was optimized for the monitoring of river water and was applied to river water analysis.

  16. Characterization of the Zymoetz river rock avalanche

    OpenAIRE

    Boultbee, Nichole Leanne

    2005-01-01

    On June 8, 2002, the Pacific Northern Gas pipeline in the Zymoetz River valley was severed over a distance of tens of meters by a large debris flow. The event initiated as a rock avalanche in Glen Falls Creek, a tributary of the 6 3 Zymoetz River. The rock avalanche involved I XI 0 m of volcaniclastic bedrock, and travelled through a complex flow path, to finally deposit a large fan in the main Zymoetz River. Approximately half of the debris volume was deposited in the cirque basin at the hea...

  17. Raft River Geothermal Aquaculture Experiment. Phase II

    Energy Technology Data Exchange (ETDEWEB)

    Campbell, D.K.; Rose, F.L.; Kent, J.C.; Watson, L.R.; Sullivan, J.F.

    1979-08-01

    Channel catfish, tilapia and Malaysian prawns were cultured directly in geothermal water for approximately seven months at the Department of Energy, Raft River Geothermal Site, to evaluate the organisms throughout a grow-out cycle. Parameters evaluated included survival, growth, bioaccumulation of metals and fluoride, collagen synthesis, and bone calcium levels. Growth at Raft River was slightly lower than at a companion commercial facility at Buhl, Idaho, but was attributed to facility differences rather than an adverse impact of geothermal water. No significant differences were recorded between Raft River and Buhl fish for bone calcium or collagen concentrations. No significant accumulation of heavy metals by fish or prawns was recorded.

  18. Old River Control Complex Sedimentation Investigation

    Science.gov (United States)

    2015-06-01

    In an alluvial river, the transport of sediment is tied very closely to the reservoir of sediment available in the sediment bed. Therefore, the...ER D C/ CH L TR -1 5- 8 Old River Control Complex Sedimentation Investigation Co as ta l a nd H yd ra ul ic s La bo ra to ry...acwc.sdp.sirsi.net/client/default. ERDC/CHL TR-15-8 June 2015 Old River Control Complex Sedimentation Investigation Ronald E. Heath, Gary L. Brown

  19. Vaal River catchment: problems and research needs

    CSIR Research Space (South Africa)

    Braune, E

    1987-01-01

    Full Text Available can be divided into four zones on the basis of water quality problems ie the Vaal Dam, the Barrage, the Bloemhof and the Douglas weir subcatchments. In general, the best quality water is found in the catchment of Vaal Dam and quality deteriorates... - 2. THE VAAL RIVER SYSTEM The Vaal River rises on the western slopes of the Drakensberg escarpment and flows about 900 km west-south-west across the interior plateau to join the Orange River near Douglas (Figure 1). The major tributaries...

  20. Count of Sockeye Salmon (Oncorhynchus nerka), River Temperature, and River Height in the Pilgrim River, Nome, Alaska, 2003-2014

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The dataset is the daily count of Sockeye Salmon (Oncorhynchus nerka) passing through a fish counting weir on the Pilgrim River from 2003 to 2014. Also, included in...

  1. River monitoring from satellite radar altimetry in the Zambezi River basin

    DEFF Research Database (Denmark)

    Michailovsky, Claire Irene B.; McEnnis, S.; Berry, P. A. M.

    2012-01-01

    is the assessment of the potential for river monitoring from radar altimetry in terms of water level and discharge in the Zambezi River basin. Retracked Envisat altimetry data were extracted over the Zambezi River basin using a detailed river mask based on Landsat imagery. This allowed for stage measurements......Satellite radar altimetry can be used to monitor surface water levels from space. While current and past altimetry missions were designed to study oceans, retracking the waveforms returned over land allows data to be retrieved for smaller water bodies or narrow rivers. The objective of this study...... to be obtained for rivers down to 80 m wide with an RMSE relative to in situ levels of 0.32 to 0.72 m at different locations. The altimetric levels were then converted to discharge using three different methods adapted to different data-availability scenarios: first with an in situ rating curve available...

  2. THE FLOODS FROM JUNE-JULY 2010 ON THE RIVERS FROM THE SUCEAVA HYDROGRAPHIC BASIN

    Directory of Open Access Journals (Sweden)

    ADRIANA MIHAELA PORCUŢAN

    2014-10-01

    Full Text Available Le bassin hydrographique asymétrique de Suceava, avec une surface de 2612 km2, est situé dans le nord de la Roumanie, mais il se propage également sur le territoire ukrainien, jusqu'à 47 o 58' N. Ce bassin hydrographique comprend deux grandes unités de secours avec des caractéristiques géographiques distinctes (montagneuse et plateau, séparés par une zone de transition représenté par un secteur de piemont et une succession de dépressions. L'analyse des crues a été faite en utilisant les données de 8 stations hydrologiques qui surveillent les inondations du cours principal (3 et des affluents les plus importants de la rivière (5. Après avoir analysé les facteurs naturels et humains qui ont produit le inondations de Juin - July 2010, on a déterminé l'espace des ondes de crue, l'heure et paramètres hydriques des cours d'eau surveillés, et à la fin il a évalué l'environnement, les risques sociaux et économiques déterminées par ces inondations.

  3. The river and the rocks: The geologic story of Great Falls and the Potomac River Gorge

    Science.gov (United States)

    Reed, John Calvin; Sigafoos, Robert Sumner; Fisher, George Wescott

    1980-01-01

    The Great Falls of the Potomac River has figured prominently in the purposes of men since prehistoric time. Long before John Smith reached the falls in 1609, groups of Indians from East and West met at this great river barrier to trade and perform ceremonies in honor of the spirit of the "Roaring Waters". As early as 1754, George Washington visualized the Potomac River as an important avenue of trade and communication with the interior.

  4. 78 FR 59237 - Regulated Navigation Area-Weymouth Fore River, Fore River Bridge Construction, Weymouth and...

    Science.gov (United States)

    2013-09-26

    ...The Coast Guard is establishing a temporary regulated navigation area (RNA) on the navigable waters of Weymouth Fore River in the vicinity of the Fore River Bridge (Mile 3.5) between Weymouth and Quincy, MA. This rule will place temporary speed, wake, and entry restrictions on vessels during bridge replacement operations. This rule is necessary to provide for the safety of life in the vicinity of the Fore River Bridge during its construction.

  5. Phenomena and characteristics of barrier river reaches in the middle and lower Yangtze River, China

    Science.gov (United States)

    You, Xingying; Tang, Jinwu

    2017-06-01

    Alluvial river self-adjustment describes the mechanism whereby a river that was originally in an equilibrium state of sediment transport encounters some disturbance that destroys the balance and results in responses such as riverbed deformation. A systematic study of historical and recent aerial photographs and topographic maps in the Middle and Lower Reaches of the Yangtze River (MLYR) shows that river self-adjustment has the distinguishing feature of transferring from upstream to downstream, which may affect flood safety, waterway morphology, bank stability, and aquatic environmental safety over relatively long reaches downstream. As a result, it is necessary to take measures to control or block this transfer. Using the relationship of the occurrence time of channel adjustments between the upstream and downstream, 34 single-thread river reaches in the MLYR were classified into four types: corresponding, basically corresponding, basically not corresponding, not corresponding. The latter two types, because of their ability to prevent upstream channel adjustment from transferring downstream, are called barrier river reaches in this study. Statistics indicate that barrier river reaches are generally single thread and slightly curved, with a narrow and deep cross-sectional morphology, and without flow deflecting nodes in the upper and middle parts of reaches. Moreover, in the MLYR, barrier river reaches have a hydrogeometric coefficient of {}1.2‱, a silty clay content of the concave bank {>}{9.5}%, and a median diameter of the bed sediment {>}{0.158} mm. The barrier river reach mechanism lies in that can effectively centralise the planimetric position of the main stream from different upstream directions, meaning that no matter how the upper channel adjusts, the main stream shows little change, providing relatively stable inflow conditions for the lower reaches. Regarding river regulation, it is necessary to optimise the benefits of barrier river reaches; long river

  6. 50 CFR Table 3 to Part 226 - Hydrologic Units Containing Critical Habitat for Snake River Sockeye Salmon and Snake River...

    Science.gov (United States)

    2010-10-01

    ... Habitat for Snake River Sockeye Salmon and Snake River Spring/Summer and Fall Chinook Salmon 3 Table 3 to... Part 226—Hydrologic Units Containing Critical Habitat for Snake River Sockeye Salmon and Snake River... Snake—Asotin 17060103 17060103 17060103 Upper Grande Ronde 17060104 Wallowa 17060105 Lower Grande Ronde...

  7. 33 CFR 207.360 - Rainy River, Minn.; logging regulations for portions of river within jurisdiction of the United...

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false Rainy River, Minn.; logging regulations for portions of river within jurisdiction of the United States. 207.360 Section 207.360 Navigation... REGULATIONS § 207.360 Rainy River, Minn.; logging regulations for portions of river within jurisdiction of the...

  8. 33 CFR 162.80 - Mississippi River below mouth of Ohio River, including South and Southwest passes.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01 false Mississippi River below mouth of Ohio River, including South and Southwest passes. 162.80 Section 162.80 Navigation and Navigable Waters... NAVIGATION REGULATIONS § 162.80 Mississippi River below mouth of Ohio River, including South and Southwest...

  9. 33 CFR 207.200 - Mississippi River below mouth of Ohio River, including South and Southwest Passes; use...

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false Mississippi River below mouth of Ohio River, including South and Southwest Passes; use, administration, and navigation. 207.200 Section... DEFENSE NAVIGATION REGULATIONS § 207.200 Mississippi River below mouth of Ohio River, including South and...

  10. River Data Package for the 2004 Composite Analysis

    Energy Technology Data Exchange (ETDEWEB)

    Rakowski, Cynthia L.; Guensch, Gregory R.; Patton, Gregory W.

    2004-08-01

    Beginning in fiscal year 2003, the DOE Richland Operations Office initiated activities, including the development of data packages, to support the 2004 Composite Analysis. The river data package provides calculations of flow and transport in the Columbia River system. This document presents the data assembled to run the river module components for the section of the Columbia River from Vernita Bridge to the confluence with the Yakima River.

  11. Geochemical characteristics of Heavy metals of river sediment from the main rivers at Texas, USA.

    Science.gov (United States)

    Matsumoto, I.; Hoffman, D.; MacAlister, J.; Ishiga, H.

    2008-12-01

    Trinity River is one of the biggest rivers which flows through Dallas and Fort Worth two big cities of USA and are highly populated. Trinity river drains into the Gulf of Mexico. Sediment samples collected from various points along the upper and lower streams were subjected to content analysis and elution analysis (using liquate (flow) out test) on the heavy metals like Cd, CN, Pb, Cr, As, Hg, Ni, Zn and Cu from the river sediment for the purpose of environment assessment. A total of 22 sample points were identified from upper stream to lower stream and samples were collected such that almost the whole stream length of Trinity River is covered. Results show that heavy metal content through out the river stream is below the recommended limits posing no immediate environmental threat. However, the experimental results show clear impact of human population in bigger cities on heavy metal concentrations in the river sediments as compared to smaller cities with low human population. It could be seen from the analysis that all the heavy metals show relatively high content and high elution value in Dallas and Fort Worth. As we move away from the big cities, the value of content and elution of sediment decreased by natural dilution effect by the river. And we also present the data of the Colorado and San Antonio rivers.

  12. Detection of major river bed changes in the River Ebro (north-eastern Spain)

    Science.gov (United States)

    Espejo, R.; Torrent, J.; Roquero, C.

    1973-01-01

    The application or ERTS-1 data to determine the major river bed changes of the Ebro River in northeastern Spain is discussed. Image quality was good enough to permit a clear identification of the river course and bands MSS 5 and 7 proved to be the most useful for this purpose. Reflectance for band 5 was high due to the high sediment content of the water and sufficed to identify the river. Features like bodies of water related to old channels and depressions were only apparent in band 7.

  13. Contribution of River Mouth Reach to Sediment Load of the Yangtze River

    Directory of Open Access Journals (Sweden)

    C. Wang

    2015-01-01

    Full Text Available This paper examined the sediment gain and loss in the river mouth reach of the Yangtze River by considering sediment load from the local tributaries, erosion/accretion of the river course, impacts of sand mining, and water extraction. A quantitative estimation of the contribution of the river mouth reach to the sediment load of the Yangtze River was conducted before and after impoundment of the Three Gorges Dam (TGD in 2003. The results showed that a net sediment load loss of 1.78 million ton/yr (Mt/yr occurred from 1965 to 2002 in the study area. The contribution of this reach to the sediment discharge into the sea is not as high as what was expected before the TGD. With impoundment of the TGD, channel deposition (29.90 Mt/yr and a net sediment loss of 30.89 Mt/yr occurred in the river mouth reach from 2003 to 2012. The river mouth reach has acted as a sink but not a source of sediment since impoundment of the TGD, which has exacerbated the decrease in sediment load. Technologies should be advanced to measure changes in river channel morphology, as well as in water and sediment discharges at the river mouth reach.

  14. 78 FR 42972 - Notice of Intent To Collect Fees on the John Day River, Oregon

    Science.gov (United States)

    2013-07-18

    ... Bureau of Land Management Notice of Intent To Collect Fees on the John Day River, Oregon AGENCY: Bureau... (River Mile 157) to Tumwater Falls (River Mile 10) stretch of the John Day River, between Service Creek, Oregon, and the confluence of the John Day River and the Columbia River, Oregon. The John Day River...

  15. Onset in-river conductivity sonde data

    Data.gov (United States)

    U.S. Environmental Protection Agency — Onset HOBO Model U24-01 in-river sondes were deployed to measure water temperature and electrical conductivity at each of the ISCO sampling sites at 5 min intervals....

  16. Advanced separations at Savannah River Site

    Energy Technology Data Exchange (ETDEWEB)

    Thompson, M.; McCabe, D.

    1996-10-01

    The Savannah River Site (SRS) has many waste streams that are contaminated with radionuclides and/or hazardous materials that must be treated to remove the radioactivity (cesium, strontium, tritium, actinides) and hazardous components (polychlorinated biphenyls (PCBs), cyanide, metal ions).

  17. SURVIVAL OF SALMONELLA SPECIES IN RIVER WATER.

    Science.gov (United States)

    The survival of four Salmonella strains in river water microcosms was monitored using culturing techniques, direct counts, whole cell hybridization, scanning electron microscopy, and resuscitation techniques via the direct viable count method and flow cytrometry. Plate counts of...

  18. Studies of mineralization in South African rivers

    CSIR Research Space (South Africa)

    Hall, GC

    1978-03-01

    Full Text Available Several South African rivers are polluted by mineral salts of diffuse source. This pollution can be related to geological phenomena and to irrigation practices. Mineralization is problematic in that it can render surface waters unsuitable...

  19. Parker River National Wildlife Refuge : Refuge Objectives

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This document lists the objectives of Parker River National Wildlife Refuge. Topics outlined in this plan include wildlife-wildlands interpretation,...

  20. Heavy metals in Mindhola river estuary, India

    Digital Repository Service at National Institute of Oceanography (India)

    Zingde, M.D.; Rokade, M.A; Mandalia, A

    The heavy metal concentrations are studied along the Mindhola river estuary. Surface and bottom water samples were collected using Niskin Sampler. The sediment samples were collected using a Van Veen grab. The heavy metal concentration is estimated...

  1. Umpqua River Oregon Active Channel 2000

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Umpqua River drains 12,103 square kilometers (4,673 square miles) in southwest Oregon before flowing into the Pacific Ocean at Winchester Bay near the city of...

  2. Savannah River Site Environmental Report for 1997

    Energy Technology Data Exchange (ETDEWEB)

    Arnett, M.W.; Mamatey, A.R. [eds.

    1998-08-01

    The mission at the Savannah River Site has changed from the production of nuclear weapons materials for national defense to the management of waste, restoration of the environment, and the development of industry in and around the site.

  3. Delaware River and Upper Bay Sediment Data

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The area of coverage consists of 192 square miles of benthic habitat mapped from 2005 to 2007 in the Delaware River and Upper Delaware Bay. The bottom sediment map...

  4. Columbia River ESI: FISH (Fish Polygons)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set contains sensitive biological resource data for marine, estuarine, anadromous, and freshwater fish species in Columbia River. Vector polygons in this...

  5. Columbia River ESI: NESTS (Nest Points)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set contains sensitive biological resource data for bird nesting sites in the Columbia River area. Vector points in this data set represent locations of...

  6. Umpqua River Oregon Active Channel 2009

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Umpqua River drains 12,103 square kilometers (4,673 square miles) in southwest Oregon before flowing into the Pacific Ocean at Winchester Bay near the city of...

  7. Umpqua River Oregon Active Channel 2005

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Umpqua River drains 12,103 square kilometers (4,673 square miles) in southwest Oregon before flowing into the Pacific Ocean at Winchester Bay near the city of...

  8. Umpqua River Oregon Active Channel 1994

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Umpqua River drains 12,103 square kilometers (4,673 square miles) in southwest Oregon before flowing into the Pacific Ocean at Winchester Bay near the city of...

  9. Umpqua River Oregon Active Channel 1939

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Umpqua River drains 12,103 square kilometers (4,673 square miles) in southwest Oregon before flowing into the Pacific Ocean at Winchester Bay near the city of...

  10. 2015 OLC FEMA Lidar: Snake River, ID

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Quantum Spatial has collected Light Detection and Ranging (LiDAR) data for the Oregon LiDAR Consortium (OLC) Snake River FEMA study area. This study area is located...

  11. Flood tracking chart, Amite River Basin, Louisiana

    Science.gov (United States)

    Callender, Lawrence E.; McCallum, Brian E.; Brazelton, Sebastian R.; Anderson, Mary L.; Ensminger, Paul A.

    1998-01-01

    The Amite River Basin flood tracking chart is designed to assist emergency response officials and the local public in making informed decisions about the safety of life and property during floods along the Amite and Comite Rivers and Bayou Manchac in southeastern Louisiana. This chart is similar in concept to the charts used to track hurricanes; the user can record the latest river stage information at selected gaging stations and the latest flood crest predictions. The latest stage data can be compared to historical flood peaks as well as to the slab or pier elevation of a threatened property. The chart also discusses how to acquire the latest river stage data from the Internet and a recorded voice message.

  12. DNR 100K Lakes and Rivers

    Data.gov (United States)

    Minnesota Department of Natural Resources — Polygons representing hydrographic features (lakes, ponds, some rivers, and open water areas) originating from the USGS 1:100,000 (100K)DLG (Digital Line Graph)...

  13. Ecological flow requirements for South African rivers

    CSIR Research Space (South Africa)

    Ferrar, AA

    1989-01-01

    Full Text Available This document contains the proceedings of a workshop which was convened to debate the ecological flow requirements of South African rivers. Topics which are discussed include the influence of weirs and impoundments, the quantity requirements...

  14. Parker River NWR : Revised Hunting Plan

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This document contains revisions to the 1978 Parker River National Wildlife Refuge Hunt Management Plan. Refuge hunters must obtain a permit to use the hunting...

  15. Savannah River Site environmental data for 1995

    Energy Technology Data Exchange (ETDEWEB)

    Arnett, M.W. [ed.

    1995-12-31

    This document presents data from Savannah River Site routine environmental monitoring and surveillance programs. An attempt also has been made to include all available data from environmental research programs.

  16. Offshore extension of Gomati river, Dwarka

    Digital Repository Service at National Institute of Oceanography (India)

    Vora, K.H.; Naik, D.K.; Ganesan, P.; Moraes, C.

    information. Attempts have been made to identify the submerged extension of Gomati River by diving inspection and based on the results obtained such as findings like stone and iron anchors, circular bastions, etc. While many features reported earlier...

  17. Radionuclide transport in the Yenisei River

    CERN Document Server

    Vakulovsky, S M; Kabanov, A I

    2012-01-01

    Data characterizing the pollution of the Yenisei River (water and bottom sediment) by radionuclide resulting from the use of the river water for cooling industrial reactors in the Mining-Chemical Complex are presented. Studies have been made of the contamination of the river during the period when reactors with direct flow cooling were used and after these were shut down. Distinctive features of the migration of radionuclide in the Yenisei are noted, in particular, their distribution between the solid and liquid phases. The amounts of 137Cs, 65Zn, 60Co, 54Mn, and 152Eu in the channel are determined from the effluent discharge site to Dudinka port. The rate of continuous self removal of 137Cs is estimated to be 0.19 1/year, corresponding to a half purification time of 3.6 years for a 600 km long segment of the river bed.

  18. Raft River geoscience case study: appendixes

    Energy Technology Data Exchange (ETDEWEB)

    Dolenc, M.R.; Hull, L.C.; Mizell, S.A.; Russell, B.F.; Skiba, P.A.; Strawn, J.A.; Tullis, J.A.

    1981-11-01

    The following are included in these appendices: lithology, x-ray analysis, and cores; well construction data; borehole geophysical logs; chemical analyses from wells at the Raft River geothermal site; and bibliography. (MHR)

  19. Trace metal pollution in Umtata River

    African Journals Online (AJOL)

    drinie

    2002-04-02

    Apr 2, 2002 ... Dissolved trace metals, i.e Fe, Mn, Al, Cu, Zn, Pb and Cd were determined in ..... River Catchment Preliminary Framework for the Development of an ... FRIES J and GETROST H (1977) Organic Reagents for Trace Analysis.

  20. Middle Mississippi River Sturgeon Preliminary Contaminants Investigation

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — We examined the health of forty-one wild caught sturgeon from a reach of the Mississippi River with an organochlorine consumption advisory and a reference site. The...

  1. Contaminant levels in the Sudbury River, Massachusetts

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Great Meadows National Wildlife Refuge sits astride the Concord and Sudbury Rivers in portions of the towns of Bedford, Billerica, Lincoln, Carlisle, Concord, and...

  2. Implementing Integrated River Basin Management in China

    Directory of Open Access Journals (Sweden)

    Dorri G. J. te Boekhorst

    2010-06-01

    Full Text Available This paper examines the role of the World Wildlife Fund for Nature China as policy entrepreneur in China. It illustrates the ways in which the World Wildlife Fund for Nature is active in promoting integrated river basin management in the Yangtze River basin and how the efforts at basin level are matched with the advice of the China Council for International Cooperation on Environment and Development task force on integrated river basin management to the national government of China. This article demonstrates that the World Wildlife Fund for Nature uses various strategies of different types to support a transition process towards integrated river basin management. Successful deployment of these strategies for change in environmental policy requires special skills, actions, and attitudes on the part of the policy entrepreneur, especially in China, where the government has a dominant role regarding water management and the position of policy entrepeneurs is delicate.

  3. 1999 Yellow River Aerial Photos, Central Wisconsin

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The 25-mile stretch of the Yellow River adjacent to the Necedah National Wildlife Refuge in Central Wisconsin provides valuable habitat to numerous species of...

  4. Anthropogenic impacts on global organic river pollution

    NARCIS (Netherlands)

    Wen, Y.

    2017-01-01

    Organic pollution of rivers by wastewater discharge from human activities negatively impacts people and ecosystems. Without treatment, pollution control relies on a combination of natural degradation and dilution by natural runoff to reduce downstream effects. To implement integrated water

  5. Little River NWR Inventory and Monitoring Plan

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This Inventory and Monitoring Plan for Little River National Wildlife Refuge is a step-down from the Comprehensive Conservation Plan and Forest Habitat Management...

  6. Savannah River Technology Center, monthly report

    Energy Technology Data Exchange (ETDEWEB)

    1994-04-01

    This is the monthly report to detail the research currently being conducted at the Savannah River Technology Center. The areas of research are in Tritium, Seperation processes, Environmental Engineering, and Waste Management.

  7. Columbia River ESI: INVERT (Invertebrate Polygons)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set contains sensitive biological resource data for clams, oysters, crabs, and other invertebrate species in Columbia River. Vector polygons in this data...

  8. American River Watershed Investigation, California. Reconnaisance Report

    National Research Council Canada - National Science Library

    1988-01-01

    .... The report describes studies of alternative measures for flood control in the American River Watershed predicated on the assumption that Auburn Dam as previously authorized will not be constructed...

  9. Using river locks to teach hydrodynamic concepts

    CERN Document Server

    Carvalho-Santos, Vagson L; Silva, Enisvaldo C; Rios, Márcio L; Silva, Anderson A P

    2013-01-01

    In this work, the use of a river lock as a non-formal setting for teaching Q2 hydrodynamical concepts is proposed. In particular, we describe the operation of a river lock situated at the Sobradinho dam, on the S\\~ao Francisco River (Brazil). A model to represent and to analyse the dynamics of river lock operation is presented and we derive the dynamical equations for the rising of the water column as an example to understand the Euler equation. Furthermore, with this activity, we enable the integration of content initially introduced in the classroom with practical applications, thereby allowing the association of physical themes to content relevant in disciplines such as history and geography. In addition, experiences of this kind enable teachers to talk about the environmental and social impacts caused by the construction of a dam and, consequently, a crossover of concepts has been made possible, leading to more meaningful learning for the students.

  10. Columbia River ESI: MGT (Management Area Polygons)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set contains sensitive human-use data for Wildlife Refuges, National Forests, and State Parks for the Columbia River area. Vector polygons in this data set...

  11. Assessing river health in Europe and Switzerland

    Science.gov (United States)

    Milano, Marianne; Chèvre, Nathalie; Reynard, Emmanuel

    2017-04-01

    River conditions and welfare of aquatic ecosystems are threatened by anthropogenic and climatic changes. The release of personal-care products, pharmaceuticals and crop protection products is increasing and climate change is likely to cause significant changes in hydrological regimes affecting water resources' capacity to dissolve pollutants. Assessing river health, i.e. the ability of a river to support and maintain a balanced ecosystem close to the natural habitat, is thus of major concern to ensure the development of ecosystems and to provide enough clean useable water to users. Such studies involve physical, chemical and biological processes and characteristics. In Europe and Switzerland, standardized procedures have been developed to assess the hydromorphological, ecological and toxicological status of rivers. The European Water Framework Directive sets ecological requirements and chemical guidelines while the Swiss Modular Stepwise Procedure suggests methods to apprehend ecological deficits and promote water management plans. In this study, both procedures were applied and compared in order (i) to address their capacity to follow-up the spatial and temporal variability of the river's water quality and (ii) to identify challenges that still need to be addressed to assess river's health. Applied on the Boiron River (canton of Vaud, Switzerland) for a 11-year period (2005-2015), both frameworks highlight that no section of the river currently meets a good environmental state. This river flows through a diversified agricultural area causing a progressive deterioration of its chemical and biological quality. The two methods also identify two periods of time with significant changes of the river's water quality. The 2009-2011 period is characterized by a significant deterioration of the river's ecological and toxicological state due to severe low flows and an increased use of pesticides. However, since 2013, an improvement in water quality is identified in

  12. Gammaridean amphipods in the Columbia River Estuary

    Energy Technology Data Exchange (ETDEWEB)

    Holton, R.L.; Higley, D.L.

    1976-01-01

    The distribution, abundance, and habitat preference of the amphipods Corophium salmonis, C. spinicorne, and Anisogammarus confervicolus were studied in the Columbia River estuary as part of baseline research during 1974 to 1976. A figure is presented showing densities of two species at selected stations in the Columbia River. Studies were also conducted on changes in faunal composition and substrate texture existing across an intertidal mudflat on the southwest shore of Youngs Bay. (HLW)

  13. Flora of the Mediterranean Rivers in Bulgaria

    OpenAIRE

    Yordanka G. Hristeva; Gana M. Gecheva; Karin Pall

    2015-01-01

    Species composition and distribution of aquatic bryophytes and vascular plants assemblages in Mediteranean Rivers in Bulgaria are presented in this work. Aquatic macrophytes were studied at thirteen rivers in South Bulgaria during 2014, together with abiotic factors (flow velocity, shading, and substrate type), mean depth and altitude. In total, 73 species were registered, of them 13 bryophytes and 60 vascular plants were identified. Aquatic bryophytes included 10 mosses and 3 liverworts. The...

  14. CHEMICAL COMPOSITION FROM THE DNIESTER RIVER TRIBUTARIES

    Directory of Open Access Journals (Sweden)

    V. Gladchi

    2013-06-01

    Full Text Available This article presents the results obtained in the framework of the project 09.832.08.06A. The role of the tributaries on formation of the Dniester river water and the study of the waters quality of sources / fountains in the catchment area of the Dniester river as sources of water supply and for irrigation in the State Program, Scientific Researches and of the management of waters quality.

  15. THE RIVER BASIN APPROACH IN TOURISM PLANNING

    OpenAIRE

    Agita Slara

    2005-01-01

    The article describes advantages and disadvantages in tourism planning, using the river basins as background territory and borders. Tourism development planning is taking place according administrative territorial borders till nowadays in Latvia and in other tourism destinations in abroad. According tourist and visitor needs and environmental friendly approach it is more appropriate to use river basins in tourism planning. Tourists are not interested in administrative borders, but in qualitat...

  16. Morphology of Tigris River within Baghdad City

    Directory of Open Access Journals (Sweden)

    A. A. Ali

    2012-10-01

    Full Text Available In recent years, substantial changes have occurred in the morphology of the River Tigris within Baghdad City. Although huge volumes of sediment are being trapped in recently constructed headwater reservoirs, the number of islands in the Tigris at Baghdad is increasing. The debris of bridges destroyed in the wars of 1991 and 2003 and their subsequent reconstruction have enhanced the development of these islands. As a consequence the ability of the river to carry the peaks of flood waters has been reduced. This has led to potential increase of flooding in parts of the city.

    The bed of the River Tigris has been surveyed on three occasions (1976, 1991, and 2008. The most recent survey was conducted by the Ministry of Water Resources, extended 49 km from the Al-Muthana Bridge north Baghdad to the confluence with the Diyala River south Baghdad. It yielded cross-section profiles at 250 m intervals. The data are used to predict the maximum flood capacity for the river using the one-dimensional hydraulic model for steady flow "HEC-RAS" modeling. Calibration of the model was carried out using field measurements for water levels along the last 15 km of the reach and the last 10 yr of observation at the Sarai Baghdad gauging station.

    The model showed a significant predicted reduction in the current river capacity below that which the river had carried during the floods of 1971 and 1988. The three surveys conducted on the same reach of the Tigris indicated that the ability of the river to transport water has decreased.

  17. Columbia River Component Data Gap Analysis

    Energy Technology Data Exchange (ETDEWEB)

    L. C. Hulstrom

    2007-10-23

    This Data Gap Analysis report documents the results of a study conducted by Washington Closure Hanford (WCH) to compile and reivew the currently available surface water and sediment data for the Columbia River near and downstream of the Hanford Site. This Data Gap Analysis study was conducted to review the adequacy of the existing surface water and sediment data set from the Columbia River, with specific reference to the use of the data in future site characterization and screening level risk assessments.

  18. River network routing on the NHDPlus dataset

    OpenAIRE

    David, Cédric,; Maidment, David,; Niu, Guo-Yue; Yang, Zong-Liang; Habets, Florence; Eijkhout, Victor

    2011-01-01

    International audience; The mapped rivers and streams of the contiguous United States are available in a geographic information system (GIS) dataset called National Hydrography Dataset Plus (NHDPlus). This hydrographic dataset has about 3 million river and water body reaches along with information on how they are connected into net- works. The U.S. Geological Survey (USGS) National Water Information System (NWIS) provides stream- flow observations at about 20 thousand gauges located on theNHDP...

  19. Salmon River Habitat Enhancement. 1990 Annual Report

    Energy Technology Data Exchange (ETDEWEB)

    Rowe, Mike

    1991-12-01

    The annual report contains three individual subproject sections detailing tribal fisheries work completed during the summer and fall of 1990. Subproject I contains summaries of evaluation/monitoring efforts associated with the Bear Valley Creek, Idaho enhancement project. Subproject II contains an evaluation of the Yankee Fork of the Salmon River habitat enhancement project. Subproject III concerns the East Fork of the Salmon River, Idaho.

  20. Ecological state of the river Ural

    Directory of Open Access Journals (Sweden)

    Gul'zhamal Tulemisova

    2017-09-01

    Full Text Available The article describes the ecological state of the Ural River at the present stage. Hydrochemical regime of the reservoir is an important indicator to regulating the number of water resources. As the Ural River is the transboundary reservoir, it is prone to contamination from various areas in the upper and middle reaches. Monitoring of the ecological state of the Ural River showed the presence of anthropogenic pollution. The hydrochemical regime of the reservoir is subject to changes in seasonal variations in water composition. In spring, with flood waters, the main pollution enters the river, however in other seasons, the quality of water leaves much to be desired. In autumn, in comparison with the spring, both alkalinity and salinity increased. The reservoir is prone to contamination with nitrites in almost all seasons of the year from 0.05 to 0.20 mg/dm3 (December, 2016. In the lower reaches of the Ural River, the content of readily oxidizable organic compounds ranges from 3.2 mg/dm3 (winter to 7.36 mg/dm3 (autumn. The content of boron exceeds the maximum permissible concentration 1-3 times. Environmental monitoring conducted in different periods of the year showed a constant source of pollution flow into the reservoir, which was increased in the flood period. Concentrations of nitrite, boron and petroleum products in the Ural River exceed their permitted values at the point in the end of Uralsk city. The results of the research confirm that the source of the contamination of Ural River is its confluent Ilek River originating from Aktobe Oblast.

  1. New River Valley Agriculture & Agritourism Strategic Plan

    OpenAIRE

    Walker, Martha A.; Scott, Kelli H.

    2017-01-01

    This strategic plan discusses plans for improving the marketing of agritourism and agribusiness in the New River Valley (Floyd, Giles, Montgomery and Pulaski Counties), and potentially increasing community wealth while improving the access to local crops and products. Includes Planning for an Agricultural Future in Giles, Montgomery, and Pulaski Counties: An Agricultural Regional Assessment, prepare for the New River Valley Agricultural & Agritourism Project Management Team by Matson Consu...

  2. Interoperability challenges in river discharge modelling

    Science.gov (United States)

    Santoro, Mattia; Schlummer, Manuela; Andres, Volker; Jirka, Simon; Looser, Ulrich; Mladek, Richard; Pappenberger, Florian; Strauch, Adrian; Utech, Michael; Zsoter, Ervin

    2014-05-01

    River discharge is a critical water cycle variable, as it integrates all the processes (e.g. runoff and evapotranspiration) occurring within a river basin and provides a hydrological output variable that can be readily measured. Its prediction is of invaluable help for many water-related areas such as water resources assessment and management, as well as flood protection and disaster mitigation. Observations of river discharge are very important for the calibration and validation of hydrological or coupled land, atmosphere and ocean models . This requires the use of data from different scientific domains (Water, Weather, etc.). Typically, such data are provided using different technological solutions and formats. This complicates the integration of new hydrological data sources into application systems. Therefore, a considerable effort is often spent on data access issues instead of the actual scientific question. In the context of the FP7 funded project GEOWOW (GEOSS Interoperability for Weather, Ocean and Water), the "River Discharge" use scenario was developed in order to combine river discharge observations data from the Global Runoff Data Center (GRDC) database and model outputs produced by the European Centre for Medium-Range Weather Forecasts (ECMWF) predicting river discharge based on weather forecast information. In this presentation we describe interoperability solutions which were adopted in order to address the technological challenges of the "River Discharge" use scenario: 1) Development of a Hydrology Profile for the OGC SOS 2.0 standard; 2) Enhancement of the GEO DAB (Discovery and Access Broker) to support the use scenario: 2.1) Develop new interoperability arrangements for GRDC and ECMWF capacities; 2.2) Select multiple time series for comparison. The development of the above functionalities and tools aims to respond to the need of Water and Weather scientists to assess river discharge forecasting models.

  3. Modélisation thermodynamique et cinétique des réactions diagénétiques dans les bassins sédimentaires. Présentation du modèle géochimique KINDISP Thermodynamic and Kinetic Modelling of Diagenetic Reactions in Sedimentary Basins. Description of the Geochemical Code Kindisp

    Directory of Open Access Journals (Sweden)

    Clement A.

    2006-11-01

    ème eau-roche. Ainsi, après le calcul de la distribution ionique des éléments à partir de la composition chimique de la solution, c'est la dissolution irréversible d'un ou plusieurs minéraux réactifsqui va faire évoluer l'ensemble du système géochimique formé d'espèces aqueuses, de minéraux primaires et secondaires. Pour un incrément de temps dt, l'apport de matière en solution est fonction de la vitesse de dissolution des minéraux réactifs . L'intérêt du modèle thermodynamique et cinétique KINDISP par rapport à un modèle purement thermodynamique est le suivi de l'évolution géochimique du système eau-roche selon la durée des réactions, c'est-à-dire qu'il est réellement prédictif en fonction du temps. Le modèle KINDISP a été appliqué pour simuler des interactions eaux/roches naturelles ou induites. A basse température, on peut citer l'étude des effets de pluies acides sur l'altération superficielle d'un massif granitique, l'estimation du temps de formation d'un horizon latéritique et les effets de polluants sur l'environnement. A plus haute température (>60 °C, le programme KINDISP a permis de simuler la prise en compte de réactions diagénétiques dans les bassins sédimentaires en vue d'exploitation des réservoirs ou bien l'étude d'un système de réactions hydrothermales provoquées par un stockage de chaleur (géothermie . . . ou l'enfouissement de colis de déchets radioactifs. . . Le second article de la série présentera quelques résultats obtenus par le modèle géochimique KINDISP appliqué à l'étude du bassin pétrolier de la Mahakam en Indonésie (Brosse et al. , 1994. Most transformations on the earth's surface are controlled by the interactions between water and rocks. The minerals that make up the rocks react with aqueous solutions; primary minerals are dissolved, thus freeing ionic species in solution and secondary minerals precipitate at thermodynamic equilibrium or in an oversaturated domain. The alteration

  4. Hydrogeochemical characteristics of the River Idrijca (Slovenia

    Directory of Open Access Journals (Sweden)

    Tjaša Kanduč

    2008-06-01

    Full Text Available The hydrogeochemical and isotope characteristics of the River Idrijca, Slovenia, where the world’s second largest mercury (Hg mine is located, were investigated. The River Idrijca, a typical steep mountain river has an HCO3- - Ca2+ - Mg2+ chemical composition. Its Ca2+/Mg2+ molar ratio indicates that dolomite weathering prevails in the watershed. The River Idrijca and its tributaries are over saturated with respect to calcite and dolomite. The pCO2 pressure is up to 13 times over atmospheric pressure and represents a source of CO2 to the atmosphere. δ18O values in river water indicate primary control from precipitation and enrichment of the heavy oxygen isotope of infiltrating water recharging the River Idrijca from its slopes.The δ13 CDIC values range from −10.8 to −6.6 ‰ and are controlled by biogeochemical processes in terrestrial environments and in the stream: 1 exchange with atmospheric CO2, 2 degradation of organic matter, 3 dissolution of carbonates, and 4 tributaries. The contributions of these inputs were calculated according to steady state equations and are estimated to be -11 %: 19 %: 31 %: 61 % in the autumn and 0 %: 6 %: 9 %: 35 % in the spring sampling seasons.

  5. The Columbia River System : the Inside Story.

    Energy Technology Data Exchange (ETDEWEB)

    United States. Bonneville Power Administration.

    1991-09-01

    The Columbia Ricer is one of the greatest natural resources in the western United States. The river and its tributaries touch the lives of nearly every resident of the Northwest-from providing the world-famous Pacific salmon to supplying the clean natural fuel for over 75 percent of the region's electrical generation. Since early in the century, public and private agencies have labored to capture the benefits of this dynamic river. Today, dozens of major water resource projects throughout the region are fed by the waters of the Columbia Basin river system. And through cooperative efforts, the floods that periodically threaten developments near the river can be controlled. This publication presents a detailed explanation of the planning and operation of the multiple-use dams and reservoirs of the Columbia River system. It describes the river system, those who operate and use it, the agreements and policies that guide system operation, and annual planning for multiple-use operation.

  6. Climate change characteristics of Amur River

    Directory of Open Access Journals (Sweden)

    Lan-lan YU

    2013-04-01

    Full Text Available Unusually severe weather is occurring more frequently due to global climate change. Heat waves, rainstorms, snowstorms, and droughts are becoming increasingly common all over the world, threatening human lives and property. Both temperature and precipitation are representative variables usually used to directly reflect and forecast the influences of climate change. In this study, daily data (from 1953 to 1995 and monthly data (from 1950 to 2010 of temperature and precipitation in five regions of the Amur River were examined. The significance of changes in temperature and precipitation was tested using the Mann-Kendall test method. The amplitudes were computed using the linear least-squares regression model, and the extreme temperature and precipitation were analyzed using hydrological statistical methods. The results show the following: the mean annual temperature increased significantly from 1950 to 2010 in the five regions, mainly due to the warming in spring and winter; the annual precipitation changed significantly from 1950 to 2010 only in the lower mainstream of the Amur River; the frequency of extremely low temperature events decreased from 1953 to 1995 in the mainstream of the Amur River; the frequency of high temperature events increased from 1953 to 1995 in the mainstream of the Amur River; and the frequency of extreme precipitation events did not change significantly from 1953 to 1995 in the mainstream of the Amur River. This study provides a valuable theoretical basis for settling disputes between China and Russia on sustainable development and utilization of water resources of the Amur River.

  7. Computational Modeling of Pollution Transmission in Rivers

    Science.gov (United States)

    Parsaie, Abbas; Haghiabi, Amir Hamzeh

    2017-06-01

    Modeling of river pollution contributes to better management of water quality and this will lead to the improvement of human health. The advection dispersion equation (ADE) is the government equation on pollutant transmission in the river. Modeling the pollution transmission includes numerical solution of the ADE and estimating the longitudinal dispersion coefficient (LDC). In this paper, a novel approach is proposed for numerical modeling of the pollution transmission in rivers. It is related to use both finite volume method as numerical method and artificial neural network (ANN) as soft computing technique together in simulation. In this approach, the result of the ANN for predicting the LDC was considered as input parameter for the numerical solution of the ADE. To validate the model performance in real engineering problems, the pollutant transmission in Severn River has been simulated. Comparison of the final model results with measured data of the Severn River showed that the model has good performance. Predicting the LDC by ANN model significantly improved the accuracy of computer simulation of the pollution transmission in river.

  8. Morphological convergence in 'river dolphin' skulls.

    Science.gov (United States)

    Page, Charlotte E; Cooper, Natalie

    2017-01-01

    Convergent evolution can provide insights into the predictability of, and constraints on, the evolution of biodiversity. One striking example of convergence is seen in the 'river dolphins'. The four dolphin genera that make up the 'river dolphins' ( Inia geoffrensis, Pontoporia blainvillei, Platanista gangetica and Lipotes vexillifer ) do not represent a single monophyletic group, despite being very similar in morphology. This has led many to using the 'river dolphins' as an example of convergent evolution. We investigate whether the skulls of the four 'river dolphin' genera are convergent when compared to other toothed dolphin taxa in addition to identifying convergent cranial and mandibular features. We use geometric morphometrics to uncover shape variation in the skulls of the 'river dolphins' and then apply a number of phylogenetic techniques to test for convergence. We find significant convergence in the skull morphology of the 'river dolphins'. The four genera seem to have evolved similar skull shapes, leading to a convergent morphotype characterised by elongation of skull features. The cause of this morphological convergence remains unclear. However, the features we uncover as convergent, in particular elongation of the rostrum, support hypotheses of shared feeding mode or diet and thus provide the foundation for future work into convergence within the Odontoceti.

  9. Migration of radionuclides through a river system

    Energy Technology Data Exchange (ETDEWEB)

    Matsunaga, Takeshi [Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment

    1999-03-01

    Migration behavior of several atmospherically-derived radionuclides in a river watershed was studied. A main interest was in their relocation from the ground soil of the watershed to a downstream region through a river. Studied radionuclides are: {sup 137}Cs generated by weapon tests in the atmosphere; {sup 210}Pb and {sup 7}Be of naturally occurring radionuclides; {sup 137}Cs, {sup 90}Sr, {sup 239,240}Pu and {sup 241}Am released by the Chernobyl nuclear power plant accident. Dominance of the form in suspended solid in river water (particulate form) was qualified for the radionuclides in the Kuji river watershed. An importance of discharge in flooding was also confirmed. A historical budget analysis for weapon test derived {sup 137}Cs was presented for the Hi-i river watershed and its accompanied lake sediment (Lake Shinji). The work afforded a scheme of a fate of {sup 137}Cs after falling on the ground soil and on the lake surface. Several controlling factors, which can influence on the chemical form of radionuclides discharged to a river, were also investigated in the vicinity of the Chernobyl nuclear power plant. A special attention was paid on the association of the radionuclides with dissolved species in water. Preferential association of Pu and Am isotopes to a large molecular size of dissolved matrices, probably of humic substances, was suggested. (author)

  10. The Mechanics of River Avulsions on Deltas

    Science.gov (United States)

    Ganti, Vamsi; Chadwick, Austin; Hassenruck-Gudipati, Hima; Lamb, Michael

    2017-04-01

    River deltas are highly dynamic, often fan-shaped depositional systems that form when rivers drain into a standing body of water. They host over a half billion people worldwide and are currently under threat of drowning and destruction by relative sea-level rise, subsidence, and anthropogenic interference. Many river deltas develop planform fan shapes through avulsions, whereby major river channel shifts occur via "channel jumping" about a persistent spatial node, thus determining their fundamental length scale. Emerging theories suggest that the size of deltas is set by backwater hydrodynamics; however, these ideas are difficult to test on natural deltas, which evolve on centennial to millennial timescales. Here, using physical experiments coupled with observations of the dynamics of modern deltaic evolution, we show that deltas grow through successive deposition of lobes that maintain a constant size that scales with backwater hydrodynamics. The preferential avulsion node in our experiments is a consequence of multiple river floods and Froude-subcritical flows that produce persistent nonuniform flows and a peak in net channel deposition within the backwater zone of the coastal river. Moreover, because the backwater hydrodynamics are controlled by the downstream boundary condition of constant sea level, the backwater-mediated avulsion sites translate seaward in step with shoreline progradation. In contrast, experimental deltas without multiple floods produce flows with uniform velocities and delta lobes that lack a characteristic size. Results have broad applications to sustainable management of deltas and for decoding their stratigraphic record on Earth and Mars.

  11. Statistical dynamics of early river networks

    Science.gov (United States)

    Wang, Xu-Ming; Wang, Peng; Zhang, Ping; Hao, Rui; Huo, Jie

    2012-10-01

    Based on local erosion rule and fluctuations in rainfall, geology and parameters of a river channel, a generalized Langevin equation is proposed to describe the random prolongation of a river channel. This equation is transformed into the Fokker-Plank equation to follow the early evolution of a river network and the variation of probability distribution of channel lengths. The general solution of the equation is in the product form of two terms. One term is in power form and the other is in exponent form. This distribution shows a complete history of a river network evolving from its infancy to “adulthood”). The infancy is characterized by the Gaussian distribution of the channel lengths, while the adulthood is marked by a power law distribution of the channel lengths. The variation of the distribution from the Gaussian to the power law displays a gradual developing progress of the river network. The distribution of basin areas is obtained by means of Hack's law. These provide us with new understandings towards river networks.

  12. Using array seismology to quantify river physics

    Science.gov (United States)

    Gimbert, F.

    2016-12-01

    Seismic ground motion measurements nearby rivers are sensitive to bedload sediment transport and turbulent fluid flow operating at river beds, both of which are major control on fluvial erosion but yet remain poorly known due to lacking observations. Seismic observations thus provide a valuable opportunity to improve our understanding of fluvial dynamics and its control on crustal erosion. However, although recently proposed theoretical frameworks provided solid grounds to link fluvial processes with seismic signal properties, a better understanding of river physics from seismic signals needs investigating turbulent flow and bedload seismic source functions from direct field observations. Here we use seismic array processing to invert river seismic source force functions and discuss the various river mechanisms that control properties of the seismic wave field. We report new seismic measurements conducted under various flow conditions at two mountain rivers with drastically different geometries: the narrow (1 m), steep ( 5 to 15%) and shallow flows ( 10 to 40 cm deep) of the Les Bossons River (Chamonix, French Alps), and the much wider ( 50 m), gentler ( 1 to 2%) and deeper flows ( 2 to 4 m deep) of the Kali Gandaki River (Lete, Nepal Himalayas). At these sites, we invert for ground velocity structure and river seismic source characteristics from the analysis of both impulsive arrivals and the continuous noise field. We report distinct spectral and directional properties between the sediment transport and the turbulent flow sources. We relate source force characteristics to physical components of sediment transport and turbulent flow dynamics such as mainly the directionality of grain impacts and the associated grain transport modes (saltation, rolling, sliding), as well as the directionality of fluid forces applied on river bed grains and the respective drag, lift and cross stream forces. To our knowledge, this is the first time that such physics of bedload

  13. L'Escarpement de Malte, le mont Alfeo et les monts de Médine: marges anciennes du bassin Ionien (synthèse des données des campagnes a la mer Escarmed Malta Escarpment, Alfeo and Medina Seamounts: Former Margins of the Ionian Basin

    Directory of Open Access Journals (Sweden)

    Groupe Escarmed

    2006-11-01

    Full Text Available Le Comité d'Etudes Pétrolières Marines (CEPM et le Centre National pour l'Exploitation des Océans (CNEXO ont mené une série d'études sous-marines des escarpements ioniens pour en définir l'origine, l'âge et l'évolution. Les résultats présentés ici concernent l'escarpement de Malte, le mont Alfeo et les monts de Médine à l'ouest et au sud-ouest du bassin Ionien profond. Ils comprennent les données bathymétriques sous forme d'une carte à 1/100 000 hors texte, l'analyse morphologique des reliefs, les déterminations stratigraphiques effectuées sur les échantillons récoltés en dragages, carottages ou en plongées, l'analyse structurale à partir de profils de sismique réflexion et des plongées, et l'étude de la subsidence depuis le Trias supérieur à partir des forages réels du plateau maltais et des forages fictifs du rebord de l'escarpement de Malte. Les conclusions font ressortir : - l'existence de séries carbonatées de plate-forme d'âge Jurassique inférieur pour l'escarpement de Malte et le mont Alfeo, et Crétacé inférieur pour les monts de Médine; - un changement paléogéographique majeur : à partir du Jurassique supérieur pour l'escarpement de Malte et à partir de l'Albien pour ceux de Médine; - l'existence de séries condensées à dater de ce changement paléogéographique et d'une érosion constante jusqu'à l'Actuel, érosion dont les processus variés ont de nombreuses conséquences sur la sédimentation de tels reliefs; - quatre phases de subsidence essentielles : Jurassique moyen, limite Crétacé inférieur-Crétacé supérieur, Miocène inférieur et moyen, Plio-Quaternaire. La parenté du mont Alfeo avec l'escarpement de Malte a été bien reconnue, par contre, les monts de Médine ne semblent se rattacher à leur histoire qu'à partir du Crétacé supérieur et ont sans doute une évolution comparable au plateau cyrénien. Ces escarpements, comme les autres escarpements ioniens, doivent leurs

  14. River Water Quality Zoning: A Case Study of Karoon and Dez River System

    Directory of Open Access Journals (Sweden)

    M Karamouz, N Mahjouri, R Kerachian

    2004-10-01

    Full Text Available Karoon-Dez River basin, with an area of 67000 square kilometers, is located in southern part of Iran. This river system supplies the water demands of 16 cities, several villages, thousands hectares of agricultural lands, and several hydropower plants. The increasing water demands at the project development stage including agricultural networks, fish hatchery projects, and inter-basin water transfers, have caused a gloomy future for water quality of the Karoon and Dez Rivers. A good part of used agricultural water, which is about 8040 million cubic meters, is returned to the rivers through agricultural drainage systems or as non-point, return flows. River water quality zoning could provide essential information for developing river water quality management policies. In this paper, a methodology is presented for this purpose using methods of -mean crisp classification and a fuzzy clustering scheme. The efficiency of these clustering methods was evaluated using water quality data gathered from the monitoring sampling points along Karoon and Dez Rivers. The results show that the proposed methodology can provide valuable information to support decision-making and to help river water quality management in the region.

  15. Restoration strategies for river floodplains along large lowland rivers in Europe

    NARCIS (Netherlands)

    Buijse, A.D.; Coops, H.; Staras, M.; Jans, L.H.; Van Geest, G.J.; Grift, R.E.; Ibelings, B.W.; Oosterberg, W.; Roozen, F.C.J.M.

    2002-01-01

    1. Most temperate rivers are heavily regulated and characterised by incised channels, aggradated floodplains and modified hydroperiods. As a consequence, former extensive aquatic /terrestrial transition zones lack most of their basic ecological functions. 2. Along large rivers in Europe and North

  16. Restoration strategies for river floodplains along large lowland rivers in Europe

    NARCIS (Netherlands)

    Buijse, A.D.; Coops, H.; Staras, M.; Jans, L.H.; Geest, van G.; Grift, R.E.; Ibelings, B.W.; Oosterberg, W.; Roozen, F.C.J.M.

    2002-01-01

    1. Most temperate rivers are heavily regulated and characterised by incised channels, aggradated floodplains and modified hydroperiods. As a consequence, former extensive aquatic/terrestrial transition zones lack most of their basic ecological functions. 2. Along large rivers in Europe and North

  17. Global river temperatures and sensitivity to atmospheric warming and changes in river flow

    NARCIS (Netherlands)

    Vliet, van M.T.H.; Ludwig, F.; Zwolsman, J.J.G.; Weedon, G.P.; Kabat, P.

    2011-01-01

    This study investigates the impact of both air temperature and river discharge changes on daily water temperatures for river stations globally. A nonlinear water temperature regression model was adapted to include discharge as a variable in addition to air temperature, and a time lag was

  18. Bank retreat study of a meandering river reach case study : River Irwell

    NARCIS (Netherlands)

    Duran, R.; Beevers, L.; Crosato, A.; Wright, N.

    2010-01-01

    Lack of data is often considered a limitation when undertaking morphological studies. This research deals with morphological studies of small rivers experiencing bank erosion processes when only limited data are available. A reach of the meandering gravel-bed river Irwell (United Kingdom) is taken

  19. River flow modeling using artificial neural networks in Kapuas river, West Kalimantan, Indonesia

    Science.gov (United States)

    Herawati, Henny; Suripin, Suharyanto

    2017-11-01

    Kapuas River is located in the province of West Kalimantan. Kapuas river length is 1,086 km and river basin areas about 100,000 Km2. The availability of river flow data in the Long River and very wide catchments are difficult to obtain, while river flow data are essential for planning waterworks. To predict the water flow in the catchment area requires a lot of hydrology coefficient, so it is very difficult to predict and obtain results that closer to the real conditions. This paper demonstrates that artificial neural network (ANN) could be used to predict the water flow. The ANN technique can be used to predict the incidence of water discharge that occurs in the Kapuas River based on rainfall and evaporation data. With the data available to do training on the artificial neural network model is obtained mean square error (MSE) 0.00007. The river flow predictions could be carried out after the training. The results showed differences in water discharge measurement and prediction of about 4%.

  20. Development west coast Taiwan: Redesign coastal area between Da’an River and Dajia River

    NARCIS (Netherlands)

    Van den Berg, B.; Eelkema, M.; Smith, M.; Van To, P.

    2006-01-01

    Master project report. In the year 2004 there was a flooding in an area between Da'an River and Dajia River in Taichung County, Taiwan. The flooding was caused by outlets which were clogged up, thus lacking the capacity to discharge the amount of rainwater that the typhoon caused into the sea. A

  1. An Evaluation of River Health for the Weihe River in Shaanxi Province, China

    Directory of Open Access Journals (Sweden)

    Jinxi Song

    2015-01-01

    Full Text Available Excessive socioeconomic activities in the Weihe River region have caused severe ecosystem degradation, and the call for the recovery and maintenance of the river health has drawn great attention. Based on the connotation of river health, previous research findings, and status quo of the Weihe River ecosystem, in this study, we developed a novel health evaluation index system to quantitatively determine the health of the Weihe River in Shaanxi Province. The river in the study area was divided into five reaches based on the five hydrological gauging stations, and appropriate evaluation indices for each river section were selected according to the ecological environmental functions of that section. A hybrid approach integrating analytic hierarchy process (AHP and a fuzzy synthetic evaluation method was applied to measure the river health. The results show that Linjiancun-Weijiabao reach and Weijiabao-Xianyang reach are in the “moderate” level of health and Lintong-Huaxian reach and downstream of Huaxian reach are in the “poor” health rating, whereas Xianyang-Lintong reach is in the “sick” rating. Moreover, the most sensitive factors were determined, respectively, for each reach from upper stream to lower stream in the study area.

  2. Canoeing the Murray River (Australia) as Environmental Education: A Tale of Two Rivers

    Science.gov (United States)

    Stewart, Alistair

    2004-01-01

    The Murray River, lying at the heart of Australia's largest catchment, is used extensively in outdoor education programs in south-eastern Australia. Since European settlement the river's ecological health has declined considerably due to activities such as damming for irrigation and clearing of native vegetation. Colonial notions of how the river…

  3. Molybdenum, vanadium, and uranium weathering in small mountainous rivers and rivers draining high-standing islands

    Science.gov (United States)

    Gardner, Christopher B.; Carey, Anne E.; Lyons, W. Berry; Goldsmith, Steven T.; McAdams, Brandon C.; Trierweiler, Annette M.

    2017-12-01

    Rivers draining high standing islands (HSIs) and small mountainous rivers (SMRs) are known to have extremely high sediment fluxes, and can also have high chemical weathering yields, which makes them potentially important contributors to the global riverine elemental flux to the ocean. This work reports on the riverine concentrations, ocean flux, and weathering yields of Molybdenum (Mo), Vanadium (V), and Uranium (U) in a large number of small but geochemically important rivers using 338 river samples from ten lithologically-diverse regions. These redox-sensitive elements are used extensively to infer paleo-redox conditions in the ocean, and Mo and V are also important rock-derived micronutrients used by microorganisms in nitrogen fixation. Unlike in large river systems, in which dissolved Mo has been attributed predominately to pyrite dissolution, Mo concentrations in these rivers did not correlate with sulfate concentrations. V was found to correlate strongly with Si in terrains dominated by silicate rocks, but this trend was not observed in primarily sedimentary regions. Many rivers exhibited much higher V/Si ratios than larger rivers, and rivers draining young Quaternary volcanic rocks in Nicaragua had much higher dissolved V concentrations (mean = 1306 nM) than previously-studied rivers. U concentrations were generally well below the global average with the exception of rivers draining primarily sedimentary lithologies containing carbonates and shales. Fluxes of U and Mo from igneous terrains of intermediate composition are lower than the global average, while fluxes of V from these regions are higher, and up to two orders of magnitude higher in the Nicaragua rivers. Weathering yields of Mo and V in most regions are above the global mean, despite lower than average concentrations measured in some of those systems, indicating that the chemical weathering of these elements are higher in these SMR watersheds than larger drainages. In regions of active boundaries

  4. Field intercomparison of channel master ADCP with RiverSonde Radar for measuring river discharge

    Science.gov (United States)

    Spain, P.; Marsden, R.; Barrick, D.; Teague, C.; Ruhl, C.

    2005-01-01

    The RiverSonde radar makes non-contact measurement of a horizontal swath of surface velocity across a river section. This radar, which has worked successfully at several rivers in the Western USA, has shown encouraging correlation with simultaneous measurements of average currents at one level recorded by an acoustic travel-time system. This work reports a field study intercomparing data sets from a 600 kHz Channel Master ADCP with the RiverSonde radar. The primary goal was to begin to explore the robustness of the radar data as a reliable index of discharge. This site Is at Three Mile Slough in Northern California, USA. The larger intent of the work is to examine variability in space and time of the radar's surface currents compared with subsurface flows across the river section. Here we examine data from a couple of periods with strong winds. ?? 2005 IEEE.

  5. River and Reservoir Operations Model, Truckee River basin, California and Nevada, 1998

    Science.gov (United States)

    Berris, Steven N.; Hess, Glen W.; Bohman, Larry R.

    2001-01-01

    The demand for all uses of water in the Truckee River Basin, California and Nevada, commonly is greater than can be supplied. Storage reservoirs in the system have a maximum effective total capacity equivalent to less than two years of average river flows, so longer-term droughts can result in substantial water-supply shortages for irrigation and municipal users and may stress fish and wildlife ecosystems. Title II of Public Law (P.L.) 101-618, the Truckee?Carson?Pyramid Lake Water Rights Settlement Act of 1990, provides a foundation for negotiating and developing operating criteria, known as the Truckee River Operating Agreement (TROA), to balance interstate and interbasin allocation of water rights among the many interests competing for water from the Truckee River. In addition to TROA, the Truckee River Water Quality Settlement Agreement (WQSA), signed in 1996, provides for acquisition of water rights to resolve water-quality problems during low flows along the Truckee River in Nevada. Efficient execution of many of the planning, management, or environmental assessment requirements of TROA and WQSA will require detailed water-resources data coupled with sound analytical tools. Analytical modeling tools constructed and evaluated with such data could help assess effects of alternative operational scenarios related to reservoir and river operations, water-rights transfers, and changes in irrigation practices. The Truckee?Carson Program of the U.S. Geological Survey, to support U.S. Department of the Interior implementation of P.L. 101-618, is developing a modeling system to support efficient water-resources planning, management, and allocation. The daily operations model documented herein is a part of the modeling system that includes a database management program, a graphical user interface program, and a program with modules that simulate river/reservoir operations and a variety of hydrologic processes. The operations module is capable of simulating lake

  6. Hydrology and morphology of two river mouth regions (temperate Vistula Delta and subtropical Red River Delta

    Directory of Open Access Journals (Sweden)

    Zbigniew Pruszak

    2005-09-01

    Full Text Available The paper presents a comparative analysis of two different river mouths from two different geographical zones (subtropical and temperate climatic regions. One is the multi-branch and multi-spit mouth of the Red River on the Gulf of Tonkin (Vietnam, the other is the smaller delta of the river Vistula on a bay of the Baltic Sea (Poland. The analysis focuses on the similarities and differences in the hydrodynamics between these estuaries and the adjacent coastal zones, the features of sediment transport, and the long-term morphodynamics of the river outlets. Salinity and water level are also discussed, the latter also in the context of the anticipated global effect of accelerated sea level rise. The analysis shows that the climatic and environmental conditions associated with geographical zones give rise to fundamental differences in the generation and dynamic evolution of the river mouths.

  7. South Fork Clearwater River Habitat Enhancement, Crooked and Red Rivers : Annual Report, 1989.

    Energy Technology Data Exchange (ETDEWEB)

    Baer, William H.

    1990-01-01

    In 1983, the Nez Perce National Forest and the Bonneville Power Administration entered into an interagency agreement to enhance and improve habitat for two anadromous fish species, spring chinook salmon (Oncorhynchus tshawyscha) and summer steelhead trout (Onchorhyncus mykiss), in the South Fork Clearwater River tributaries. The South Fork Clearwater River was dammed in 1927 for hydroelectric development. Anadromous fish runs were virtually eliminated until the dam was removed in 1962. To complicate the problem, upstream spawning and rearing habitats were severely impacted by dredge and hydraulic mining, road building, timber harvest, and over-grazing. Fish habitat improvement projects under the above contract are being carried out in two major tributaries to the South Fork Clearwater River. Both the Red River and the Crooked River projects began in 1983 and will be completed in 1990. 12 figures., 1 tab.

  8. Characterizing seston in the Penobscot River Estuary.

    Science.gov (United States)

    Meseck, Shannon L; Li, Yaqin; Sunila, Inke; Dixon, Mark; Clark, Paul; Lipsky, Christine; Stevens, Justin R; Music, Paul; Wikfors, Gary H

    2017-10-01

    The Penobscot River Estuary is an important system for diadromous fish in the Northeast United States of American (USA), in part because it is home to the largest remnant population of Atlantic salmon, Salmo salar, in the country. Little is known about the chemical and biological characteristics of seston in the Penobscot River Estuary. This study used estuarine transects to characterize the seston during the spring when river discharge is high and diadromous fish migration peaks in the Penobscot River Estuary. To characterize the seston, samples were taken in spring 2015 for phytoplankton identification, total suspended matter (TSM), percent organic TSM, chlorophyll a, particle size (2 μm-180 μm), particulate carbon and nitrogen concentrations, and stable carbon and nitrogen isotopes. The estuarine profiles indicate that TSM behaved non-conservatively with a net gain in the estuary. As phytoplankton constituted only 1/1000 of the particles, the non-conservative behavior of TSM observed in the estuary was most likely not attributable to phytoplankton. Particulate carbon and nitrogen ratios and stable isotope signals indicate a strong terrestrial, allochthonous signal. The seston in the Penobscot River Estuary was dominated by non-detrital particles. During a short, two-week time period, Heterosigma akashiwo, a phytoplankton species toxic to finfish, also was detected in the estuary. A limited number of fish samples, taken after the 2015 Penobscot River Estuary bloom of H. akashiwo, indicated frequent pathological gill damage. The composition of seston, along with ichthyotoxic algae, suggest the need for further research into possible effects upon resident and migratory fish in the Penobscot River Estuary. Published by Elsevier Ltd.

  9. Optimisation of flux calculation in rivers from discrete water quality surveys, a step towards an expert system

    Science.gov (United States)

    Raymond, S.; Moatar, F.; Meybeck, M.; Bustillo, V.

    2009-04-01

    ) including a quadratic runoff module (Bustillo, 2005), 1 linear interpolation method and 2 discharge-weighted concentration methods ("M18", "M19", Philipps et al, 1999). As expected, based on 55 stations and 430 years, SPM fluxes are the most uncertain ones with maximum biases determined on annual fluxes (monthly sampling simulations). ranging at stations from -75% to +55% by the classical rating-curves approach ("M1", "M2") droping to -60% to +5% for the M18 method. At this frequency, biases are much less for Ptot and PO4-3 (-30% to +10%), nitrate (-5% to +10%) and are negligible for TDS. For higher frequencies, the biases are reduced: for instance for weekly surveys they drop to -25% for SPM and to -20% to 5% for Ptot for the M18 method. The river basin size is influencing the performance of calculations methods: SPM flux errors are much higher for smaller basins (103 to 104 km2) than for larger ones (> 104 km2), probably in relation with the flow duration in 2% of time which is a key control factor of flux duration in 2% of time (Moatar et al, 2006). This indicator based on daily flow (Q) records is generally available at water quality stations. Other indicators based on discrete water quality surveys are being tested to explain the performance of flux methods for each variable: concentrations (C) variability, C vs Q relationship, concentration seasonality. For each variable and each station the optimal flux calculation method will be derived from the future expert system. BUSTILLO V., Biogéochimie et hydroclimatologie appliquées à l'aménagement des bassins fluviaux .PhD Thesis, INP Toulouse,232 p+annexes (2005). FERGUSON R.I., Accuracy and precision of methods for estimating river loads. Earth Surface Processes and Landforms, vol. 12,95-104 (1987). MOATAR F., PERSON G., MEYBECK M., COYNEL A., ETCHEBER H., CROUZET P., The influence of contrasting suspended particulate matter transport regimes on the bias and precision of flux estimates Science of the Total Environment

  10. Suitability Evaluation on River Bank Filtration of the Second Songhua River, China

    Science.gov (United States)

    Wang, Lixue; Ye, Xueyan; Du, Xinqiang

    2016-04-01

    The Second Songhua River is the biggest river with the most economic value in Jilin Province, China. In recent years, with the rapid development of economy, water resources and water environment problem is getting prominent, including surface water pollution and over exploitation of groundwater resources, etc. By means of bank filtration, the Second Songhua River basin might realize the combined utilization of regional groundwater and surface water, and thus has important significance for the guarantee of water demand for industrial and agricultural production planning in the basin. The following steps were adopted to evaluate the suitability of bank filtration nearby the Scond Songhua River : Firstly, in order to focus on the most possible area, the evaluation area was divided based on the aspects of natural geographical conditions and hydraulic connection extent between river water and groundwater. Second, the main suitability indexes including water quantity, water quality, interaction intensity between surface water and groundwater, and the exploitation condition of groundwater resource, and nine sub-indexes including hydraulic conductivity, aquifer thickness, river runoff, the status of groundwater quality, the status of surface water quality, groundwater hydraulic gradient, possible influence zone width of surface water under the condition of groundwater exploitation, permeability of riverbed layer and groundwater depth were proposed to establish an evaluation index system for the suitability of river bank filtration. Thirdly, Combined with the natural geography, geology and hydrogeology conditions of the Second Songhua River basin, the ArcGIS technology is used to complete the evaluation of the various indicators. According to the weighted sum of each index, the suitability of river bank filtration in the study area is divided into five grades. The evaluation index system and evaluation method established in this article are applicable to the Second Songhua

  11. RiverHeath: Neighborhood Loop Geothermal Exchange System

    Energy Technology Data Exchange (ETDEWEB)

    Geall, Mark [RiverHeath LLC, Appleton, WI (United States)

    2016-07-11

    The goal of the RiverHeath project is to develop a geothermal exchange system at lower capital infrastructure cost than current geothermal exchange systems. The RiverHeath system features an innovative design that incorporates use of the adjacent river through river-based heat exchange plates. The flowing water provides a tremendous amount of heat transfer. As a result, the installation cost of this geothermal exchange system is lower than more traditional vertical bore systems. Many urban areas are located along rivers and other waterways. RiverHeath will serve as a template for other projects adjacent to the water.

  12. Smartphone for measuring river discharge

    Science.gov (United States)

    Peña-Haro, Salvador; Lüthi, Beat; Philippe, Thomas

    2015-04-01

    Smartphones have become powerful and have extended their capacities including different types of sensors. These capabilities make them very interesting for its applications in water management. We have developed a new mobile device application for open-channel flow measurements. This app can be used to determine the flow in e.g. rivers, artificial channels, irrigation ditches, furrows, etc. The smartphone app computes the runoff by analysing a few seconds of a movie that is recorded using the smartphone camera. The runoff is calculated from the estimated water level, surface velocity and from prior knowledge on the channel geometry. The water level is determined by the separation line of image segments with and without optical flow. Via calibration of the smartphone camera position this separation line is mapped to a water level. The surface velocity is calculated using a modified method of the standard Particle Image Velocimetry method. Among the key characteristics of the method is the fact that no tracer particles are needed. There are two flavours of the app. In the first one, all the measurements are taken using the available sensors in the mobile device and all the calculations are made making only use of the device. Three results are given back: the water level, the average surface velocity and discharge. This information can be sent via SMS. In the second one, the movie is send to a central computer where more detailed calculations are made, like fine camera calibration, camera stabilization tuning, definition of the region of interest, the sub-windows for the velocity analysis can be changed, different algorithms can be chosen, etc. It also generates more detailed results. Using smartphones, measurements can be made at much lower cost, since there is no need of permanent installations, which also makes it possible to take measurements in any place.

  13. Columbia River impact evaluation plan

    Energy Technology Data Exchange (ETDEWEB)

    1993-06-01

    As a result of past practices, four areas of the Hanford Site (the 100, 200, 300, and 1100 Areas) have been included on the US Environmental Protection Agency`s (EPA`s) National Priorities List (NPL) under the Comprehensive Environmental Response, Compensation, and Liability Act of 1980. To accomplish the timely cleanup of the past-practice units, the Hanford Federal Facility Agreement and Consent Order (Tri-Party Agreement), was signed by the Washington State Department of Ecology (Ecology), EPA, and the US Department of Energy (DOE). To support the Tri-Party Agreement, milestones were adopted. These milestones represent the actions needed to ensure acceptable progress toward Hanford Site compliance with CERCLA, RCRA, and the Washington State Hazardous Waste Management Act of 1976. This report was prepared to fulfill the requirement of Tri-Party Agreement Milestone M-30-02, which requires a plan to determine cumulative health and environmental impacts to the Columbia River. This plan supplements the CERCLA remedial investigations/feasibility studies (RI/FS) and RCRA facility investigations/corrective measures studies (RFI/CMSs) that will be undertaken in the 100 Area. To support the plan development process, existing information was reviewed and a preliminary impact evaluation based on this information was performed. The purpose of the preliminary impact evaluation was to assess the adequacy of existing data and proposed data collection activities. Based on the results of the evaluation, a plan is proposed to collect additional data or make changes to existing or proposed data collection activities.

  14. RIVER PROTECTION PROJECT SYSTEM PLAN

    Energy Technology Data Exchange (ETDEWEB)

    CERTA PJ; KIRKBRIDE RA; HOHL TM; EMPEY PA; WELLS MN

    2009-09-15

    The U.S. Department of Energy (DOE), Office of River Protection (ORP) manages the River Protection Project (RPP). The RPP mission is to retrieve and treat Hanford's tank waste and close the tank farms to protect the Columbia River. As a result, ORP is responsible for the retrieval, treatment, and disposal of approximately 57 million gallons 1 of radioactive waste contained in the Hanford Site waste tanks and closure2 of all the tanks and associated facilities. The previous revision of the System Plan was issued in May 2008. ORP has made a number of changes to the tank waste treatment strategy and plans since the last revision of this document, and additional changes are under consideration. ORP has contracts in place to implement the strategy for completion of the mission and establish the capability to complete the overall mission. The current strategl involves a number of interrelated activities. ORP will reduce risk to the environment posed by tank wastes by the following: (1) Retrieving the waste from the single-shell tanks (SST) to double-shell tanks (DST) and delivering the waste to the Waste Treatment and Immobilization Plant (WTP). (2) Constructing and operating the WTP, which will safely treat all of the high-level waste (HLW) fraction contained in the tank farms. About one-third of the low-activity waste (LAW) fraction separated from the HLW fraction in the WTP will be immobilized in the WTP LAW Vitrification Facility. (3) Developing and deploying supplemental treatment capability assumed to be a second LAW vitrification facility that can safely treat about two-thirds of the LAW contained in the tank farms. (4) Developing and deploying supplemental pretreatment capability currently assumed to be an Aluminum Removal Facility (ARF) using a lithium hydrotalcite process to mitigate sodium management issues. (5) Developing and deploying treatment and packaging capability for contact-handled transuranic (CH-TRU) tank waste for possible shipment to and

  15. RIVER PROTECTION PROJECT SYSTEM PLAN

    Energy Technology Data Exchange (ETDEWEB)

    CERTA PJ

    2008-07-10

    The U.S. Department of Energy (DOE), Office of River Protection (ORP) manages the River Protection Project (RPP). The RPP mission is to retrieve and treat Hanford's tank waste and close the tank farms to protect the Columbia River. As a result, the ORP is responsible for the retrieval, treatment, and disposal of the approximately 57 million gallons of radioactive waste contained in the Hanford Site waste tanks and closure of all the tanks and associated facilities. The previous revision of the System Plan was issued in September 2003. ORP has approved a number of changes to the tank waste treatment strategy and plans since the last revision of this document, and additional changes are under consideration. The ORP has established contracts to implement this strategy to establish a basic capability to complete the overall mission. The current strategy for completion of the mission uses a number of interrelated activities. The ORP will reduce risk to the environment posed by tank wastes by: (1) Retrieving the waste from the single-shell tanks (SST) to double-shell tanks (DST) for treatment and disposal; (2) Constructing and operating the WTP, which will safely treat all of the high-level waste (HLW) and about half of the low-activity waste (LAW) contained in the tank farms, and maximizing its capability and capacity; (3) Developing and deploying supplemental treatment capability or a second WTP LAW Facility that can safely treat about half of the LAW contained in the tank farms; (4) Developing and deploying treatment and packaging capability for transuranic (TRU) tank waste for shipment to and disposal at the Waste Isolation Pilot Plant (WIPP); (5) Deploying interim storage capacity for the immobilized HLW and shipping that waste to Yucca Mountain for disposal; (6) Operating the Integrated Disposal Facility for the disposal of immobilized LAW, along with the associated secondary waste, (7) Closing the SST and DST tank farms, ancillary facilities, and al1 waste

  16. Resilience scales of a dammed tropical river

    Science.gov (United States)

    Calamita, Elisa; Schmid, Martin; Wehrli, Bernhard

    2017-04-01

    Artificial river impoundments disrupt the seasonality and dynamics of thermal, chemical, morphological and ecological regimes in river systems. These alterations affect the aquatic ecosystems in space and time and specifically modify the seasonality and the longitudinal gradients of important biogeochemical processes. Resilience of river systems to anthropogenic stressors enables their recovery along the flow path; however little is known about the longitudinal distance that rivers need to partially restore their physical, chemical and biological integrity. In this study, the concept of a "resilience scale" will be explored for different water quality parameters downstream of Kariba dam, the largest artificial lake in the Zambezi basin (South-East Africa). The goal of this project is to develop a modelling framework to investigate and quantify the impact of large dams on downstream water quality in tropical context. In particular, we aim to assess the degree of reversibility of the main downstream alterations (temperature, oxygen, nutrients) and consequently the quantification of their longitudinal extent. Coupling in-situ measurements with hydraulic and hydrological parameters such as travel times, will allow us to define a physically-based parametrization of the different resilience scales for tropical rivers. The results will be used for improving future dam management at the local scale and assessing the ecological impact of planned dams at the catchment scale.

  17. ANTHROPOGENIC LOAD ON RIVERS OF URBAN AREAS

    Directory of Open Access Journals (Sweden)

    Kurochkina Valentina Aleksandrovna

    2016-08-01

    Full Text Available The increasing speed of urbanization and population growth lead to the increasing anthropogenic load on water bodies. The urbanization processes in Russia are more intensive than in other countries. The dense population and great industrial potential lead to the fact that the urbanized territories become the main sources of water pollution. That’s why the environmental control of the state of water objects is needed. In the article the authors study the problem of anthropogenic load impact on river hydraulics processes and on the properties of river sediments that determine river channels evolution and general ecological state of water bodies. The interrelation between ecological state of water bodies, the quality of water in it and the level of contamination with sediments was determined. It is established that the conditions of long-term aquatic life as a whole and of water quality in particular depend on the contamination level with sediments. The author proposes a method of estimation of anthropogenic load on rivers. The paper analyses the calculation results of the value of anthropogenic load on different rivers of Russia.

  18. Tidal controls on river delta morphology

    Science.gov (United States)

    Hoitink, A. J. F.; Wang, Z. B.; Vermeulen, B.; Huismans, Y.; Kästner, K.

    2017-09-01

    River delta degradation has been caused by extraction of natural resources, sediment retention by reservoirs, and sea-level rise. Despite global concerns about these issues, human activity in the world’s largest deltas intensifies. Harbour development, construction of flood defences, sand mining and land reclamation emerge as key contemporary factors that exert an impact on delta morphology. Tides interacting with river discharge can play a crucial role in the morphodynamic development of deltas under pressure. Emerging insights into tidal controls on river delta morphology suggest that--despite the active morphodynamics in tidal channels and mouth bar regions--tidal motion acts to stabilize delta morphology at the landscape scale under the condition that sediment import during low flows largely balances sediment export during high flows. Distributary channels subject to tides show lower migration rates and are less easily flooded by the river because of opposing non-linear interactions between river discharge and the tide. These interactions lead to flow changes within channels, and a more uniform distribution of discharge across channels. Sediment depletion and rigorous human interventions in deltas, including storm surge defence works, disrupt the dynamic morphological equilibrium and can lead to erosion and severe scour at the channel bed, even decades after an intervention.

  19. Evaluation of kinetic energy in flowing rivers

    Energy Technology Data Exchange (ETDEWEB)

    Faure, T. [National Research Council of Canada, Ottawa, ON (Canada). Canadian Hydraulics Centre

    2008-07-01

    New methods of evaluating the kinetic energy in rivers were discussed. Developed by the National Research Council's Canadian Hydraulics Centre, the numerical models were designed to generate hydrographs of river flow from dams; accommodate power density anomalies caused by the presence of islands in a river; and assess mean kinetic power rates. This presentation provided details of a simulation of 6 turbines located in close proximity to each other. The model was used to calculate velocity fields downstream of the turbines as well as changes in water surface elevation due to power production by the 6 75 kW turbines. Turbine power extraction and kinetic power in the upstream cross-section was assessed. The model showed that the turbines extracted 9 per cent of the river's 17,000 kW of estimated energy potential. The turbines were modelled by considering the porosity of the numerical elements at the location of the turbine and extracting known quantities of energy from the flow. The model was also used to calculate new hydrodynamics of the whole region with the turbines in place by assuming that energy was extracted over the entire depth of the location. The presentation included detailed charts of rivers modelled during the study. tabs., figs.

  20. Effects of human activities on the ecological processes of river biofilms in a highly urbanized river

    Science.gov (United States)

    Hung, R.; Li, M.

    2013-12-01

    Many anthropogenic disturbances and their effects of aquatic ecosystem are difficult to quantify in urbanized rivers. In past, specific taxa analysis of community structure was a common approach in river health monitoring studies. However, it is still difficult to understand stream ecosystem integrity without considering ecosystem processes. The complex species composition and metabolism of a river biofilm have the capacity to interact and/or modulate their surrounding environment. Because of their short life cycles, species richness, and worldwide distribution, structure and function of river biofilm communities are sensitive to change in environmental conditions. Therefore, biofilms are widely used as early warning systems of water pollution for water quality monitoring studies. In this study, we used river biofilms as a bioindicator by examining their extracellular enzyme activities and photosynthesis efficiency to understand human activities on the ecological processes of river ecosystem in a highly urbanized river. We sampled four sites along the Keelung River, Taiwan, based on different intensities of anthropogenic disturbances including water pollution index, population densities, land use types and types of stream habitats. Two study sites are heavily influenced by human activities and the others are not. The activities of extracellular enzymes within the biofilm play an important function for organic matter decomposition and nutrient cycling. We measured seven extracellular enzyme activities (β-d-glucosidase, phosphatase, leucine-aminopeptidase, sulfatase, peroxidase, polyphenol oxidase, and esterase) to examine specific enzyme activity changes at four study sites monthly. In addition, relative proportion of each extracellular enzyme activity on total enzyme activities was calculated in order to examine the relationship between functional biofilm profiles and different urban intensities. Among four study sites, leucine-aminopeptidase and esterase

  1. Removal of river embankments and the modelled effects on river-floodplain hydrodynamics

    Science.gov (United States)

    Clilverd, Hannah; Thompson, Julian; Heppell, Kate; Sayer, Carl; Axmacher, Jan

    2015-04-01

    The channelization and embankment of rivers has led to major ecological degradation of aquatic habitats worldwide. River restoration, which often includes the removal of previously constructed barriers between a river and its floodplain, is now being widely used to create favourable hydrological conditions for target species or processes. However the effects of river restoration on hydraulic and hydrological processes are complex, and are often difficult to determine due to the infrequency of long-term monitoring programmes before and after restoration works. To examine the hydrological impacts of embankment removal under a variety of possible hydrological conditions, we developed coupled hydrological/hydraulic models of pre-embankment and post-embankment conditions at a wet grassland meadow in Norfolk, UK using the MIKE-SHE/MIKE 11 system. Groundwater hydrology and climate were monitored between 2007 and 2010 with river inflows being provided from an upstream gauging station. The embanked model was calibrated and validated with observed groundwater data for two consecutive 12-month periods, after which the restored topography was applied to the model and validated for a subsequent 12-month period. The restored model was then run for the same period as the embanked model (i.e. with the same river inflow, precipitation, and potential evapotranspiration data) to remove interannual climate variability and enable a direct comparison between models. Modelled groundwater levels compared well with piezometer observations and reproduced the observed rapid groundwater response to high magnitude rainfall and river flow events. Removal of the embankments resulted in frequent localised flooding at the river edge, widespread floodplain inundation at flows greater than 1.9 m3 sec-1, as well as higher groundwater levels and greater subsurface storage. Restoration had only a minor effect on flood peak attenuation (maximum 5% flood peak reduction), likely due to the small size of

  2. Navigation Conditions at Gray's Landing Locks and Dam, Monongahela River; Hydraulic Model Investigation

    National Research Council Canada - National Science Library

    Wooley, Ronald

    1998-01-01

    The Monongahela River (Figure 1) is formed by the confluence of the Tygart Valley and West Fork Rivers at Fairmont, WV, and flows in a northerly direction joining with the Allegheny River at Pittsburgh, PA, to form the Ohio River...

  3. Coherence between coastal and river flooding along the California coast

    Science.gov (United States)

    Odigie, Kingsley O.; Warrick, Jonathan

    2017-01-01

    Water levels around river mouths are intrinsically determined by sea level and river discharge. If storm-associated coastal water-level anomalies coincide with extreme river discharge, landscapes near river mouths will be flooded by the hydrodynamic interactions of these two water masses. Unfortunately, the temporal relationships between ocean and river water masses are not well understood. The coherence between extreme river discharge and coastal water levels at six California river mouths across different climatic and geographic regions was examined. Data from river gauges, wave buoys, and tide gauges from 2007 to 2014 were integrated to investigate the relationships between extreme river discharge and coastal water levels near the mouths of the Eel, Russian, San Lorenzo, Ventura, Arroyo Trabuco, and San Diego rivers. Results indicate that mean and extreme coastal water levels during extreme river discharge are significantly higher compared with background conditions. Elevated coastal water levels result from the combination of nontidal residuals (NTRs) and wave setups. Mean and extreme (>99th percentile of observations) NTRs are 3–20 cm and ∼30 cm higher during extreme river discharge conditions, respectively. Mean and extreme wave setups are up to 40 cm and ∼20–90 cm higher during extreme river discharge than typical conditions, respectively. These water-level anomalies were generally greatest for the northern rivers and least for the southern rivers. Time-series comparisons suggest that increases in NTRs are largely coherent with extreme river discharge, owing to the low atmospheric pressure systems associated with storms. The potential flooding risks of the concurrent timing of these water masses are tempered by the mixed, semidiurnal tides of the region that have amplitudes of 2–2.5 m. In summary, flooding hazard assessments for floodplains near California river mouths for current or future conditions with sea-level rise should include the temporal

  4. Delimitation of permanent protected areas of rivers in Brazil

    Science.gov (United States)

    Leonardi, Silvia S.; Namikawa, Laércio M.; de F. Oliveira, João. R.; Rosim, Sergio

    2014-10-01

    This paper presents a methodology to determine the permanent protected areas (PPA) of the the riverbanks. The amount of protected area depends on the river width and the size of each property which have a river running through or by it, as stated in the Brazilian forest code law. The rules are: 30 meters for rivers up to 10 meters wide, 50m for rivers 10 to 50m wide, 100m for rivers 50 to 200m wide, 200m for rivers 200 to 600m wide, and 500m, to rivers wider than 600m. The steps to determine the PPA buffer along the river are (1) construction of the triangular grid (TIN) that constitutes the basis for the calculation of the central axis of the river; (2) definition of the points representing the central axis of the river, called skeletonization; (3) definition of the river width; (4) calculation of the buffer for each river segment. PPA is defined by overlaying the river protected area polygon with the property polygon. A PPA area of a property can be reduced according to its size and according to public improvements like roads, permanent protected areas, for example. At the end the area to be preserved in a property is delimited.

  5. Anthropogenic Influence on the Dynamics of the River Lamprey Lampetra fluviatilis Landings in the River Daugava Basin

    Science.gov (United States)

    Birzaks, Janis; Abersons, Kaspars

    2011-01-01

    The construction of the Daugava hydro power station (HPS) cascade has significantly transformed Latvia's largest river the Daugava, reducing its importance in the natural reproduction of anadromous fish species. Currently in Latvia, as well as in other Baltic Sea countries, the river lamprey catch is decreasing, whereas the landings in the river Daugava have tended to increase. The dynamics of the river lamprey landings show the possible redistribution of lamprey stocks between the rivers Gauja and the Daugava. Possibly, this is a result of anthropogenic influence and changes in the river lamprey resource management may be necessary in the future.

  6. Floodplain methylmercury biomagnification factor higher than that of the contiguous river (South River, Virginia USA)

    Energy Technology Data Exchange (ETDEWEB)

    Newman, Michael C., E-mail: newman@vims.edu [College of William and Mary - VIMS, P.O. Box 1346, Rt. 1208 Greate Rd., Gloucester Point, VA 23062 (United States); Xu Xiaoyu, E-mail: xiaoyu@vims.edu [College of William and Mary - VIMS, P.O. Box 1346, Rt. 1208 Greate Rd., Gloucester Point, VA 23062 (United States); Condon, Anne, E-mail: anne_condon@fws.gov [U.S. Fish and Wildlife, 6669 Short Lane, Gloucester, VA 23061 (United States); Liang Lian, E-mail: liang@cebam.net [Cebam Analytical, Inc., 18804 North Creek Parkway, Suite 110, Bothell, WA 98011 (United States)

    2011-10-15

    Mercury biomagnification on the South River floodplain (Virginia, USA) was modeled at two locations along a river reach previously modeled for methylmercury movement through the aquatic trophic web. This provided an opportunity to compare biomagnification in adjoining trophic webs. Like the aquatic modeling results, methylmercury-based models provided better prediction than those for total mercury. Total mercury Food Web Magnification Factors (FWMF, fold per trophic level) for the two locations were 4.9 and 9.5. Methylmercury FWMF for the floodplain locations were higher (9.3 and 25.1) than that of the adjacent river (4.6). Previous speculation was not resolved regarding whether the high mercury concentrations observed in floodplain birds was materially influenced by river prey consumption by riparian spiders and subsequent spider movement into the trophic web of the adjacent floodplains. Results were consistent with a gradual methylmercury concentration increase from contaminated floodplain soil, to arthropod prey, and finally, to avian predators. - Highlights: > First comparison of methylmercury biomagnification in adjacent river/land food webs. > Methylmercury increased more rapidly in the terrestrial, than the aquatic, food web. > Methylmercury increased gradually from soil, to prey, and, to avian predators. - Higher methylmercury biomagnification on South River floodplain than the associated river likely explain high mercury in floodplain birds.

  7. Seasonal variability of Crvena river water mineralization

    Directory of Open Access Journals (Sweden)

    Manojlović Predrag

    2010-01-01

    Full Text Available The mineralization of water and its content in Crvena River so far have not been studied. Water sampling was conducted from April 2008 - May 2009. Total mineralization is relatively low, which is consistent with the dominant lithological structure (Permian red sandstone. Dry residue contains Ca2+ ion, with the increased participation of SiO2. During the observational period it is clearly expressed seasonal effect. It is reflected not in the direct but the indirect impact. Based on the ratio of individual ions a model is determined for estimation of water flow at the confluence of the Crvena River in Nisava River. It could be applied to other drainage basins that have not been studied so far.

  8. Smoky River coal flood risk mapping study

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2004-06-01

    The Canada-Alberta Flood Damage Reduction Program (FDRP) is designed to reduce flood damage by identifying areas susceptible to flooding and by encouraging application of suitable land use planning, zoning, and flood preparedness and proofing. The purpose of this study is to define flood risk and floodway limits along the Smoky River near the former Smoky River Coal (SRC) plant. Alberta Energy has been responsible for the site since the mine and plant closed in 2000. The study describes flooding history, available data, features of the river and valley, calculation of flood levels, and floodway determination, and includes flood risk maps. The HEC-RAS program is used for the calculations. The flood risk area was calculated using the 1:100 year return period flood as the hydrological event. 7 refs., 11 figs., 7 tabs., 3 apps.

  9. River plastic emissions to the world's oceans

    Science.gov (United States)

    Lebreton, Laurent C. M.; van der Zwet, Joost; Damsteeg, Jan-Willem; Slat, Boyan; Andrady, Anthony; Reisser, Julia

    2017-06-01

    Plastics in the marine environment have become a major concern because of their persistence at sea, and adverse consequences to marine life and potentially human health. Implementing mitigation strategies requires an understanding and quantification of marine plastic sources, taking spatial and temporal variability into account. Here we present a global model of plastic inputs from rivers into oceans based on waste management, population density and hydrological information. Our model is calibrated against measurements available in the literature. We estimate that between 1.15 and 2.41 million tonnes of plastic waste currently enters the ocean every year from rivers, with over 74% of emissions occurring between May and October. The top 20 polluting rivers, mostly located in Asia, account for 67% of the global total. The findings of this study provide baseline data for ocean plastic mass balance exercises, and assist in prioritizing future plastic debris monitoring and mitigation strategies.

  10. ICHTHYOFAUNA OF A PART OF SAVA RIVER

    Directory of Open Access Journals (Sweden)

    Dobrila Habeković

    1997-07-01

    Full Text Available Based on a personal research from 1991-1994 the ichthyofauna structure of the part of the Sava river upstream from Zagreb on the section from Podsused to Gradna mouth is presented. The data are being compared with the results of the research of this part of the Sava river before constructing the Krško nuclear power plant. The ichthyological samples were taken seasonally, on various water levels and temperatures of the Sava river. A qualitative and quantitive structure of the fish communities was identified (Tabels 1 to 7. The researched area is populated by fish of the transitional-plain type of the open waters, which means it belongs to the typical barbel region with all the related fish species. The most numerous is the Cyprinidae family, dominated by the chub species (Leuciscus cephalus L.. Around thirty species and subspecies of fish and Cyclostomata populates the area.

  11. Flood Forecasting in River System Using ANFIS

    Science.gov (United States)

    Ullah, Nazrin; Choudhury, P.

    2010-10-01

    The aim of the present study is to investigate applicability of artificial intelligence techniques such as ANFIS (Adaptive Neuro-Fuzzy Inference System) in forecasting flood flow in a river system. The proposed technique combines the learning ability of neural network with the transparent linguistic representation of fuzzy system. The technique is applied to forecast discharge at a downstream station using flow information at various upstream stations. A total of three years data has been selected for the implementation of this model. ANFIS models with various input structures and membership functions are constructed, trained and tested to evaluate efficiency of the models. Statistical indices such as Root Mean Square Error (RMSE), Correlation Coefficient (CORR) and Coefficient of Efficiency (CE) are used to evaluate performance of the ANFIS models in forecasting river flood. The values of the indices show that ANFIS model can accurately and reliably be used to forecast flood in a river system.

  12. [Nutrients Input Characteristics of the Yangtze River and Wangyu River During the "Water Transfers on Lake Taihu from the Yangtze River"].

    Science.gov (United States)

    Pan, Xiao-xue; Ma, Ying-qun; Qin, Yan-wen; Zou, Hua

    2015-08-01

    Overall 20 surface water samples were collected from the Yangtze River, the Wangyu River and the Gonghu Bay (Lake Taihu) to clarify the pollution characteristics of nitrogen and phosphorus during 2 sample stages of "Water Transfers on Lake Taihu from the Yangtze River" in August and December of 2013 respectively. The results showed that the mass concentrations of NO2- -N, NO3- -N, NH4+ -N and TN in the Gonghu Bay were lower than those of the Yangtze River and Wangyu River during the 2 water transfer processes. However, there was higher level of DON content in the Gonghu Bay than that of the Yangtze River and Wangyu River. The percentages of various N species showed that NO3- -N was the major N species in the Yangtze River and Wangyu River during the 2 water transfer processes. TP contents in samples collected from the Yangtze River displayed a constant trend compared with the Wangyu River. However, the percentages of various P species were different with each other during the 2 water transfer processes. Mass concentrations of DON and TP in surface water in August were higher than those in December and the contents of NO3- -N and TDP were lower in August than those in December. In general, NO3- -N and TPP were the main N and P species in Wangyu River from the Yangtze River. NO3- -N, PO4(3-) -P and TPP were the main N and P species in Gonghu Bay from Wangyu River during the 2 water transfer processes.

  13. Evaluate Status of Pacific Lamprey in the Clearwater River and Salmon River Drainages, Idaho, 2009 Technical Report.

    Energy Technology Data Exchange (ETDEWEB)

    Cochnauer, Tim; Claire, Christopher [Idaho Department of Fish and Game

    2009-05-07

    Pacific lamprey Lampetra tridentata have received little attention in fishery science until recently, even though abundance has declined significantly along with other anadromous fish species in Idaho. Pacific lamprey in Idaho have to navigate over eight lower Snake River and Columbia River hydroelectric facilities for migration downstream as juveniles to the Pacific Ocean and again as adults migrating upstream to their freshwater spawning grounds in Idaho. The number of adult Pacific lamprey annually entering the Snake River basin at Ice Harbor Dam has declined from an average of over 18,000 during 1962-1969 to fewer than 600 during 1998-2006. Based on potential accessible streams and adult escapement over Lower Granite Dam on the lower Snake River, we estimate that no more than 200 Pacific lamprey adult spawners annually utilize the Clearwater River drainage in Idaho for spawning. We utilized electrofishing in 2000-2006 to capture, enumerate, and obtain biological information regarding rearing Pacific lamprey ammocoetes and macropthalmia to determine the distribution and status of the species in the Clearwater River drainage, Idaho. Present distribution in the Clearwater River drainage is limited to the lower sections of the Lochsa and Selway rivers, the Middle Fork Clearwater River, the mainstem Clearwater River, the South Fork Clearwater River, and the lower 7.5 km of the Red River. In 2006, younger age classes were absent from the Red River.

  14. Morphodynamic river processes and techniques for assessment of channel evolution in Alpine gravel bed rivers

    Science.gov (United States)

    Formann, E.; Habersack, H. M.; Schober, St.

    2007-10-01

    Over the past 10 years many restoration projects have been undertaken in Austria, and river engineering measures such as spur dykes and longitudinal bank protection, which imposed fixed lateral boundaries on rivers, have been removed. The EU-Life Project "Auenverbund Obere Drau" has resulted in extensive restoration on the River Drau, aimed to improve the ecological integrity of the river ecosystem, to arrest riverbed degradation, and to ensure flood protection. An essential part of the restoration design involved the consideration of self-forming river processes, which led to new demands being imposed on river management. This paper illustrates how model complexity is adapted to the solution and evaluation of different aspects of river restoration problems in a specific case. Point-scale monitoring data were up-scaled to the whole investigation area by means of digital elevation models, and a scaling approach to the choice of model complexity was applied. Simple regime analysis methods and 1-D models are applicable to the evaluation of long-term and reach-scale restoration aims, and to the prediction of kilometre-scale processes (e.g. mean river bed aggradation or degradation, flood protection). 2-D models gave good results for the evaluation of hydraulic changes (e.g. transverse flow velocities, shear stresses, discharges at diffluences) for different morphological units at the local scale (100 m-10 m), and imposed an intermediate demand on calibration data and topographic survey. The study shows that complex 3-D numerical models combined with high resolution digital elevation models are necessary for detailed analysis of processes (1 m-0.01 m), but not for the evaluation of the restoration aims on the River Drau. In conclusion, model choice (complexity) will depend on both lower limits (determined by the complexity of processes to be analysed) and upper limits (field data quality and process understanding for numerical models).

  15. Sediment regime constraints on river restoration - An example from the lower Missouri river

    Science.gov (United States)

    Jacobson, R.B.; Blevins, D.W.; Bitner, C.J.

    2009-01-01

    Dammed rivers are subject to changes in their flow, water-quality, and sediment regimes. Each of these changes may contribute to diminished aquatic habitat quality and quantity. Of the three factors, an altered sediment regime is a particularly unyielding challenge on many dammed rivers. The magnitude of the challenge is illustrated on the Lower Missouri River, where the largest water storage system in North America has decreased the downriver suspended-sediment load to 0.2%–17% of pre-dam loads. In response to the altered sediment regime, the Lower Missouri River channel has incised as much as 3.5 m just downstream of Gavins Point Dam, although the bed has been stable to slightly aggrading at other locations farther downstream. Effects of channel engineering and commercial dredging are superimposed on the broad-scale adjustments to the altered sediment regime.The altered sediment regime and geomorphic adjustments constrain restoration and management opportunities. Incision and aggradation limit some objectives of flow-regime management: In incising river segments, ecologically desirable reconnection of the floodplain requires discharges that are beyond operational limits, whereas in aggrading river segments, small spring pulses may inundate or saturate low-lying farmlands. Lack of sediment in the incising river segment downstream of Gavins Point Dam also limits sustainable restoration of sand-bar habitat for bird species listed under the Endangered Species Act. Creation of new shallow-water habitat for native fishes involves taking sediment out of floodplain storage and reintroducing most or all of it to the river, raising concerns about increased sediment, nutrient, and contaminant loads. Calculations indicate that effects of individual restoration projects are small relative to background loads, but cumulative effects may depend on sequence and locations of projects. An understanding of current and historical sediment fluxes, and how they vary along the river

  16. Impacts of Colville River dynamics on river navigability near Nuiqsut, Alaska: 1955-present

    Science.gov (United States)

    Whitley, M. A.; Panda, S. K.; Prakash, A.; Brinkman, T. J.

    2016-12-01

    Climate-driven changes in river systems are challenging access to ecosystem services such as access to traditional hunting grounds and other subsistence food sources on the North Slope of Alaska. This work studies the dynamics of the Colville River and assesses the impacts on traditional harvest practices and subsistence travel of the Native community of Nuiqsut. Recent reports from Nuiqsut residents indicate accelerated changes in the environment, limiting river travel and their ability to harvest subsistence food. This study explores how channel migration, gravel bars, and bank erosion have evolved since the 1950s, and their impact on water depth and navigability. In an area of ice-rich permafrost, warmer summer temperatures exacerbate lateral bank erosion, resulting in river siltation. The study focuses on selected key areas south of Nuiqsut that have shown significant change in river geomorphology. Since 1955, some areas proximate to ice wedge exposures show channel migration in excess of 1 km. Panchromatic aerial photography acquired by US Geological Surveys in the mid 1950s, color infrared aerial photography from 1979 and 1982 acquired by the Alaska High Altitude Photography (AHAP) mission, and high resolution satellite images from Digital Globe, Inc. were used in this study. We mapped water, vegetation, and gravel/non-vegetated classes to identify risk areas for river navigability. River bathymetry was also mapped using a multispectral ratio-based water depth retrieval algorithm to identify problem sites for boat travel. Remote sensing products and analyses were validated with field data for mapping risk areas along the river. This study has the potential to be implemented on a larger scale for predictive mapping to aid river navigation. Findings from this study will provide insight whether recent changes are anomalies, or if they are part of a directional trend that will require local adaptation.

  17. Land protection plan : Bear River Watershed Conservation Area

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The U.S. Fish and Wildlife Service is establishing a conservation area for the Bear River watershed in Idaho, Utah, and Wyoming. The Bear River Watershed...

  18. Russian River Ice Thickness and Duration, Version 1

    Data.gov (United States)

    National Aeronautics and Space Administration — This data set consists of river ice thickness measurements, and beginning and ending dates for river freeze-up events from fifty stations in northern Russia. The...

  19. Simulating the discharge of the Mandovi River, Goa

    Digital Repository Service at National Institute of Oceanography (India)

    SupritKumar; Shankar, D.

    Simulation studies are carried out to estimate the discharge of the Mandovi River, Goa. The Mandovi River catchment area includes the slopes of the Sahyadris, where estimates of precipitation are not available. A multivariate interpolation scheme...

  20. 2009 Oregon Parks and Recreation Department Lidar: Columbia River

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The data set represents the lidar elevations along the Columbia River corridor in Oregon, including portions of the following counties: Gilliam, Hood River,...