WorldWideScience

Sample records for causeways

  1. Modeling the effect of Causeways on Circulation in the Banana River

    Science.gov (United States)

    Saberi, A.; Weaver, R. J.

    2015-12-01

    The Indian River Lagoon (IRL) is a restricted estuary along the east coast of Florida. Although Banana River, a 50 km long sub-basin of IRL, has an outlet to the ocean through the Port Canaveral locks, the locks remain closed when there is no passing vessel. The lack of direct ocean connection results in limited circulation, long flushing time and poor water quality. Existence of the causeways limits the circulation even more. In this study, the impact of the causeways on flushing time is studied. This study also examines the extent to which constructing a low crested weir adjacent to Port Canaveral can improve flushing in this region. ADCIRC 2DDI is forced with meteorological inputs as well as tides to simulate the hydrodynamic properties of the study area and determine the 2D depth-averaged velocity field for four separate cases: Existing System with and without consideration of the causeways, and modified system (adding a weir near port Canaveral) with and without consideration of the causeways. Passive particles are placed in Banana River, and their movement is tracked using a Lagrangian Particle Tracking Model (LPTM). Transport timescales are then computed, and residence time contours as well as pathlines of selected particles are plotted. Results indicate that the narrow raised pathway section of the causeways acts as a plate which diverts the flow direction and generates eddies in the downstream which causes the particles in the vicinity of the causeways remain in the domain for a longer duration. There is a longer residence time for the case in which the causeways are considered. The results with the added weir suggest a noticeable improvement in flushing time and residence time even for the case in which the causeways are considered in the model.

  2. Port Isabel (GIWW) Channel Improvements at the Queen Isabella Causeway. Laguna Madre, Texas, Navigation Improvement Project

    Science.gov (United States)

    2009-09-01

    ER D C/ CH L TR -0 9 -1 3 Port Isabel (GIWW) Channel Improvements at the Queen Isabella Causeway Laguna Madre , Texas, Navigation...Causeway Laguna Madre , Texas, Navigation Improvement Project Timothy W. Shelton, P.E. and Dennis Webb, P.E. Coastal and Hydraulics Laboratory U.S...distribution is unlimited. Prepared for U.S. Army Corps of Engineer District, Galveston Galveston, TX 77550 ERDC/CHL TR-09-13 ii Abstract: Laguna Madre is

  3. Proximate environmental drivers of coral communities at Palmyra Atoll: establishing baselines prior to removing a WWII military causeway.

    Science.gov (United States)

    Williams, Gareth J; Knapp, Ingrid S; Maragos, James E; Davy, Simon K

    2011-08-01

    A management proposal aims to partly remove a WWII military causeway at Palmyra Atoll to improve lagoon water circulation and alleviate sedimentation stress on the southeast backreef, an area of high coral cover and diversity. This action could result in a shift in sedimentation across reef sites. To provide management advice, we quantified the proximate environmental factors driving scleractinian coral cover and community patterns at Palmyra. The proportion of fine sedimentation was the optimal predictor of coral cover and changes in community structure, explaining 23.7% and 24.7% of the variation between sites, respectively. Scleractinian coral cover was negatively correlated with increases in fine sedimentation. Removing the causeway could negatively affect the Montipora corals that dominate the western reef terrace, as this genus was negatively correlated with levels of fine sedimentation. The tolerance limits of corals, and sediment re-distribution patterns, should be determined prior to complete removal of the causeway.

  4. Research on Motion Performance of the Mobile Double-Causeway Pier System

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    Mobile offshore double-causeway pier system, a type of seashore unloading equipment, consists of two groups of multiple connected semi-submersible modules. This structure has wide application because most of the middle or mini type of vessels and ships can be moored to it. Based on the analysis of computational methods of multi-body motion response, a hydrodynamic model is set up and the three-dimensional potential theory in finite depth is adopted to calculate the three-dimensional motion response of this system. The double P-M spectrum is used to analyze the motion response in irregular waves. Different wave directions are specially taken into consideration, due to their various effects to the motion response. Furthermore, the calculated result is compared with that of the experiment, and it is proved that sway, heave, pitch and yaw motion are greatly constrained by mooring system. The comparison also indicates that the model can forecast the motion performance of the target, and that the calculated result can also be used as reference in connector and mooring system design.

  5. CONSTRUCTION OF A CAUSEWAY BRIDGE ACROSS THE LAKE URMIA AND ITS INFLUENCE ON DRYING TREND OF THE LAKE

    Directory of Open Access Journals (Sweden)

    M. Ghadimi

    2015-12-01

    Full Text Available Construction of a causeway bridge on the Lake Urmia accelerated the drying trend of the largest hyper-saline lake of the world. The objective of the research is to investigate the differences of precipitation and river discharge before and after initiation of the construction of the bridge in 2000. The study area was the watershed of the lake. The averages of the precipitation data in the two periods before and after the project have been interpolated by IDW based on GIS Geostatistical Analyst. The two interpolated precipitation layers were used to be plugged into Student T-test equation in GIS in a spatial basis. To do this, the study area was divided to 25 regions based on drainage sub-basins. Less than 30 sample areas were randomly selected as cases from each of the regions to put into the equation. The discharge data were also compared for the two periods. The results indicated that except in some limited areas, the precipitation differences in the two periods are significant. This means that there were little changes in precipitation and river discharge in the area and consequently the drying may be caused mainly by hydrodynamic changes in the lake due to construction of the causeway. However, it can be argued that the changes in the lake’s surface area are accompanied by changes in precipitation and river discharge. The t test statistic can be applied samples based on spatial analysis.

  6. MOSES - Inflatable Causeway

    Science.gov (United States)

    2007-08-01

    buoyant. Kevlar and Zylon are good alternatives, but they are denser then water, hence they will not float. The draw back from Supreme Protector...Retention % (due to UV rays after 6 Months) Zylon AS 5.8 1.54 3.5 90 35 Zylon HM 5.8 1.56 2.5 N/A 35 p-Aramid 2.8 1.45 2.4 100 N/A m-Aramid...Sites. Off- Shore Air Compressors. 15 June 2007. < http://www.fas.org/man/dod-101/sys/land/index.html> Toyobo Family of Sites. Zylon Fabric. 19

  7. Slope Failure Hazards at Basalt Geomorphosites: A Comparative Analysis of the Giant's Causeway World Heritage Site, UK and Penghu Marine Geopark, Taiwan.

    Science.gov (United States)

    Gruendemann, Ciaran; Chung Lin, Jiun; Smith, Bernard

    2010-05-01

    Columnar basalt landscapes hold a fascination that transcends geographical and cultural boundaries. It is because of this that they feature so prominently on the global register of significant geomorphosites. Arguably the most iconic of these basalt landscapes is the Giant's Causeway in Northern Ireland, a status recognized by its inscription as a World Heritage Site. Recognition at this level invariably brings visitor pressure, and with it concern as to the impact they exert on site integrity. Rarely, however, is the same overt concern expressed for the risks that such sites pose to the visitors - or not at least until disaster strikes. Yet, the very features that make these sites attractive - tall, exposed, largely unconstrained columns - render many of them intrinsically unstable, prone to catastrophic collapse and potentially hazardous to visitors. In this presentation we highlight the nature of these slope instability issues through a comparative analysis of two geographically contrasting basalt geomorphosites. Investigations of slope hazard at the Giant's Causeway have shown that many are linked to the distinctive structural characteristics and weathering patterns of flood basalts. Typically, individual flows comprise a columnar ‘colonnade', topped by a blocky ‘entablature' and separated from the flows above and below it by a structurally weaker, but often less-permeable, palaeosol that formed during periods of volcanic quiescence. The collapse of columns is often facilitated by a combination of weathering along ever-widening joints and wedging outwards by debris that falls into them. This gradual distortion of the colonnade makes columns increasingly susceptible to collapse. Often this is triggered by intense rainfall (perhaps following a dry spell) that rapidly infiltrates joints and is ponded on the underlying palaeosol. The precise nature of the failure (toppling or outwards rotation of the column base) is largely dictated by the nature of the

  8. 78 FR 25577 - Safety Zone, Figure Eight Causeway Channel; Figure Eight Island, NC

    Science.gov (United States)

    2013-05-02

    ... marine information broadcasts, local notice to mariners, commercial radio stations, and area newspapers... announced via Marine Safety Radio Broadcast on VHF Marine Band Radio channel 22 (157.1 MHz) that this... at telephone number (910) 343-3882 or by radio on VHF Marine Band Radio, channels 13 and 16....

  9. 78 FR 20451 - Drawbridge Operation Regulations; Pelican Island Causeway, Galveston, Channel, TX

    Science.gov (United States)

    2013-04-05

    ... CFR Code of Federal Regulations DHS Department of Homeland Security FR Federal Register NPRM Notice of... discretionary regulatory actions. In particular, the Act addresses actions that may result in the expenditure by a State, local, or tribal government, in the aggregate, or by the private sector of...

  10. Exposure to methyl tert-butyl ether, benzene, and total hydrocarbons at the Singapore-Malaysia causeway immigration checkpoint

    Energy Technology Data Exchange (ETDEWEB)

    Tan, C.; Ong, H.Y.; Kok, P.W. [and others

    1996-12-31

    The primary aim of this study was to determine the extent and levels of exposure to volatile organic compounds (VOCs) from automobile emissions in a group of immigration officers at a busy cross-border checkpoint. A majority (80%) of the workers monitored were exposed to benzene at levels between 0.01 and 0.5 ppm, with only 1.2% exceeding the current Occupational Safety and Health Administration occupational exposure limit of 1 ppm. The geometric mean (GM) concentrations of 8-hr time-weighted average exposure were 0.03 ppm, 0.9 ppm, and 2.46 ppm for methyl-tert-butyl ether (MTBE), benzene, and total hydrocarbons (THC), respectively. The highest time-weighted average concentrations measured were 1.05 ppm for MTBE, 2.01 ppm for benzene, and 34 ppm for THC. It was found that motorbikes emitted a more significant amount of pollutants compared with motor cars. On average, officers at the motorcycle booths were exposed to four to five times higher levels of VOCs (GMs of 0.07 ppm, 0.23 ppm, and 4.7 ppm for MTBE, benzene, and THC) than their counterparts at the motor car booths (GMs of 0.01 ppm, 0.05 ppm, and 1.5 ppm). The airborne concentrations of all three pollutants correlated with the flow of vehicle traffic. Close correlations were also noted for the concentrations in ambient air for the three pollutants measured. Benzene and MTBE had a correlation coefficient of 0.97. The overall findings showed that the concentrations of various VOCs were closely related to the traffic density, suggesting that they were from a common source, such as exhaust emissions from the vehicles. The results also indicated that although benzene, MTBE, and THC are known to be volatile, a significant amount could still be detected in the ambient environment, thus contributing to our exposure to these compounds. 4 refs., 6 figs.

  11. 33 CFR 115.50 - Application for bridge permits.

    Science.gov (United States)

    2010-07-01

    ... authority not necessary. Coast Guard approval of the location and plans for construction or modification of a bridge or causeway is not required for any bridge or causeway over waters which are not subject to... (historic use). This provision does not apply to bridges which connect the United States with any...

  12. Kinetics, Mechanism and Product Yields in the Atmospheric Oxidation of Dimethylsulfide

    Science.gov (United States)

    2016-06-14

    Rosenstiel School of Marine and Atmospheric Science University of Miami 4600 Rickenbacker Causeway Miami, Florida 33149-1098 ahynes...decomposition and reaction, b) direct confirmation of production, and quantitative product yields of potential reaction products and intermediates...School of Marine and Atmospheric Science ,4600 Rickenbacker Causeway,Miami,FL,33149 8. PERFORMING ORGANIZATION REPORT NUMBER 9. SPONSORING/MONITORING

  13. Natural and Artificial Connections between Atoll Islets in the Pacific, Their Process and Environmental Impact

    Institute of Scientific and Technical Information of China (English)

    XUE Chunting; Russell Howorth

    2003-01-01

    Three types of natural connection between atoll islets are described. Causeway, as an artificial way of connecting islets, makes a connection to be completed in a few months. In this case shore adjustment becomes more vigorous than that in natural conditions, resulting in lagoon shore erosion. A causeway without short bridges or culverts should be built close to the lagoon shore to reduce lagoon shore erosion. A causeway-crossing channel assemblage is the worst type among all of the connection engineering constructions because the crossing channel traps sediment and further transports it out of the channel, resulting in long period coastal erosion. Reforming Nippon Causeway in Tarawa Atoll, Kiribati by simple means will stop sand loss, reduce shore erosion and greatly upgrade its stability.

  14. Le bilingue, surhomme ou infirme? (The Bilingual, Superman or Cripple?)

    Science.gov (United States)

    Tournier, Michel

    1975-01-01

    Discusses good translation techniques, "true bilingualism," and the effect of bilingualism on cognitive development. (Text is in French.) Available from Lloyds Bank Chambers, 91 Newington Causeway, London SE1 6BN, England. (AM)

  15. Two-Dimensional Depth-Averaged Circulation Model CMS-M2D: Version 3.0, Report 2, Sediment Transport and Morphology Change

    Science.gov (United States)

    2006-08-01

    patterns in the Upper Laguna Madre and exchange of water with the Gulf of Mexico were calculated for proposed causeway modifications designed to...As a result of the analysis, the Kennedy Causeway was elevated to provide improved circulation to the Laguna Madre and a more reliable evacuation...Militello, A., and Kraus, N. C. (1995). “Investigation of the current and sediment movement in the Lower Laguna Madre , Texas, and implications for

  16. Lagrangian Data Analysis in Mesoscale Prediction and Model Validation Studies

    Science.gov (United States)

    2016-06-21

    Department Rosenstiel School of Marine and Atmospheric Science 4600 Rickenbacker Causeway, Miami, Florida 33149 phone: (305) 361 4892, fax: (305) 361...of Marine and Atmospheric Science ,4600 Rickenbacker Causeway,Miami,FL,33149 8. PERFORMING ORGANIZATION REPORT NUMBER 9. SPONSORING/MONITORING AGENCY...stratification and direct wind forcing. Second, a stochastic Lagrangian model of transport has been implemented, and tested with positive results against

  17. The Paracel Islands and U.S. Interests and Approaches in the South China Sea

    Science.gov (United States)

    2014-06-01

    on Woody Island and adjoining Rocky Island, including roads and a causeway, government and military buildings, a hos- pital, a hostel , a post...objections to Part XI covering exploitation of the deep seabed is a main one because its provisions are considered statist and not free- market oriented, and

  18. Numerical Modelling Approaches for Assessing Improvements to the Flow Circulation in a Small Lake

    Directory of Open Access Journals (Sweden)

    Cheng He

    2011-01-01

    Full Text Available Kamaniskeg Lake is a long, narrow, and deep small lake located in the northern part of Ontario, Canada. The goals of this paper were to examine various options to improve the water quality in the northern part of the lake by altering the local hydraulic flow conditions. Towards this end, a preliminary screening suggested that the flow circulation could be increased around a central island (Mask Island in the northern part of the lake by opening up an existing causeway connecting the mainland and central island. Three-dimensional (3D hydraulic and transport models were adopted in this paper to investigate the hydraulic conditions under various wind forces and causeway structures. The modelling results show that opening the causeway in a few places is unlikely to generate a large flow circulation around the central island. Full circulation only appears to be possible if the causeway is fully removed and a strong wind blows in a favourable direction. The possible reasons for existing water quality variations at the intake of a local WTP (water treatment plant are also explored in the paper.

  19. 76 FR 48844 - FFP Project 11 LLC; Notice of Preliminary Permit Application Accepted for Filing and Soliciting...

    Science.gov (United States)

    2011-08-09

    ...) flexible cables would convey each arrays power to a metering station; and (4) a transmission line would... Flow Power Corporation, 239 Causeway Street, Boston, MA 02114; phone (978) 283-2822. FERC Contact....asp . You must include your name and contact information at the end of your comments. For...

  20. 76 FR 48845 - FFP Project 5 LLC; Notice of Preliminary Permit Application Accepted for Filing and Soliciting...

    Science.gov (United States)

    2011-08-09

    ... kilowatts; (3) flexible cables would convey each arrays power to a metering station; and (4) a transmission...: Ramya Swaminathan, Free Flow Power Corporation, 239 Causeway Street, Boston, MA 02114; phone (978) 283.../docs-filing/ecomment.asp . You must include your name and contact information at the end of...

  1. 76 FR 48846 - FFP Project 125 LLC; Notice of Preliminary Permit Application Accepted for Filing and Soliciting...

    Science.gov (United States)

    2011-08-09

    ... transmission line would interconnect with the power grid. The proposed project would have an average annual...: Ramya Swaminathan, Free Flow Power Corporation, 239 Causeway Street, Boston, MA 02114; phone (978) 283.../docs-filing/ecomment.asp . You must include your name and contact information at the end of...

  2. 78 FR 44110 - FFP Project 124, LLC; Notice of Preliminary Permit Application Accepted for Filing and Soliciting...

    Science.gov (United States)

    2013-07-23

    ...-Volt (kV) substation; and (5) a 0.4-mile-long, 69kV transmission line. The proposed project would have.... Applicant Contact: Mr. Daniel Lissner, Free Flow Power Corporation, 239 Causeway Street, Suite 300, Boston... and contact information at the end of your comments. For assistance, please contact FERC...

  3. 76 FR 48851 - Notice of Preliminary Permit Application Accepted for Filing and Soliciting Comments, Motions To...

    Science.gov (United States)

    2011-08-09

    ... would convey each arrays power to a metering station; and (4) a transmission line would interconnect... Flow Power Corporation, 239 Causeway Street, Boston, MA 02114; phone (978) 283-2822. FERC Contact....asp . You must include your name and contact information at the end of your comments. For...

  4. 76 FR 48851 - FFP Project 50 LLC; Notice of Preliminary Permit Application Accepted for Filing and Soliciting...

    Science.gov (United States)

    2011-08-09

    ... kilowatts; (3) flexible cables would convey each array's power to a metering station; and (4) a transmission...: Ramya Swaminathan, Free Flow Power Corporation, 239 Causeway Street, Boston, MA 02114; phone (978) 283.../docs-filing/ecomment.asp . You must include your name and contact information at the end of...

  5. 76 FR 48850 - Notice of Preliminary Permit Application Accepted for Filing and Soliciting Comments, Motions To...

    Science.gov (United States)

    2011-08-09

    ... kilowatts; (3) flexible cables would convey each arrays power to a metering station; and (4) a transmission...: Ramya Swaminathan, Free Flow Power Corporation, 239 Causeway Street, Boston, MA 02114; phone (978) 283.../docs-filing/ecomment.asp . You must include your name and contact information at the end of...

  6. 78 FR 44111 - FFP Project 123, LLC; Notice of Preliminary Permit Application Accepted for Filing and Soliciting...

    Science.gov (United States)

    2013-07-23

    ... (5) a 1.0-mile-long, 36.7kV transmission line. The proposed project would have an average annual... Lissner, Free Flow Power Corporation, 239 Causeway Street, Suite 300, Boston, MA 02114. (978) 283-2822... information at the end of your comments. For assistance, please contact FERC Online Support at...

  7. 78 FR 44110 - FFP Project 130, LLC; Notice of Preliminary Permit Application Accepted for Filing and Soliciting...

    Science.gov (United States)

    2013-07-23

    ... tailrace; (4) a 4.16/69 kilo-Volt (kV) substation; and (5) a 10-mile-long, 69kV transmission line. The... by the Corps. Applicant Contact: Mr. Daniel Lissner, Free Flow Power Corporation, 239 Causeway Street... must include your name and contact information at the end of your comments. For assistance,...

  8. 76 FR 48849 - FFP Project 46 LLC; Notice of Preliminary Permit Application Accepted for Filing and Soliciting...

    Science.gov (United States)

    2011-08-09

    ...; and (4) a transmission line would interconnect with the power grid. The proposed project would have an.... Applicant Contact: Ramya Swaminathan, Free Flow Power Corporation, 239 Causeway Street, Boston, MA 02114...://www.ferc.gov/docs-filing/ecomment.asp . You must include your name and contact information at the...

  9. 76 FR 48847 - FFP Project 49 LLC; Notice of Preliminary Permit Application Accepted for Filing and Soliciting...

    Science.gov (United States)

    2011-08-09

    ... kilowatts; (3) flexible cables would convey each arrays power to a metering station; and (4) a transmission...: Ramya Swaminathan, Free Flow Power Corporation, 239 Causeway Street, Boston, MA 02114; phone (978) 283.../docs-filing/ecomment.asp . You must include your name and contact information at the end of...

  10. 76 FR 48852 - FFP Project 42 LLC; Notice of Preliminary Permit Application Accepted for Filing and Soliciting...

    Science.gov (United States)

    2011-08-09

    ...; and (4) a transmission line would interconnect with the power grid. The proposed project would have an.... Applicant Contact: Ramya Swaminathan, Free Flow Power Corporation, 239 Causeway Street, Boston, MA 02114...://www.ferc.gov/docs-filing/ecomment.asp . You must include your name and contact information at the...

  11. 77 FR 55693 - Safety Zone; Miami Paddle Challenge, Biscayne Bay, Miami, FL

    Science.gov (United States)

    2012-09-11

    ... SECURITY Coast Guard 33 CFR Part 165 RIN 1625-AA08 Safety Zone; Miami Paddle Challenge, Biscayne Bay, Miami... Causeway in Miami, Florida during the Miami Paddle Challenge, a series of paddle boat races. The Miami Paddle Challenge is scheduled to take place on Sunday, September 29, 2012. The temporary safety zone...

  12. 75 FR 81561 - Huron-Manistee National Forests, Michigan, Land and Resource Management Plan Supplemental...

    Science.gov (United States)

    2010-12-28

    ... Dunes Wilderness), as well as the possible effects of the project on tourism in the counties affected...--Mio Ranger Station, 107 McKinley Road, Mio, MI, from 4-7 p.m.; 2/02/11--Causeway Bay Hotel (Will...

  13. 75 FR 63533 - Environmental Impact Statement: Cameron County, TX

    Science.gov (United States)

    2010-10-15

    ... proposed improvements to United States Highway 181/State Highway 286 (Crosstown Expressway), in Nueces... Nueces County, Texas. The project limits were defined as the limits of the schematic design. The project... the Corpus Christi Ship Channel but south of the Nueces Bay Causeway; the southern limit was the...

  14. CTD and Bottle Data from Leg 1: 20 December 1986 - 18 January 1987. Leg 2: 17 July - 15 August 1987

    Science.gov (United States)

    1989-06-01

    650, Japan Biblioteca, Centro de Investigacion Cientifca y Educacion Superior de Prof. Hideo Kawai Ensenada, Apartado Postal 2732 Kyoto University...Science Division of Meteorology and Physical Oceanography University of Miami TIC 4600 Rickenbacker Causeway f ELECTE Miami, Florida 33149 S SEP2Z 1989D and

  15. 78 FR 33400 - Free Flow Power Corporation; Notice Soliciting Scoping Comments

    Science.gov (United States)

    2013-06-04

    ... subsidiary PayneBridge, LLC. e. Name of Project: Williams Dam Water Power Project. f. Location: At the existing Williams dam owned by the Indiana Department ] of Natural Resources on the East Fork White River... Causeway Street, Suite 300, Boston, MA 02114; or at (978) 283-2822. Alan Topalian, Regulatory...

  16. 78 FR 22870 - Free Flow Power Corporation; Notice of Application Accepted for Filing and Soliciting Motions To...

    Science.gov (United States)

    2013-04-17

    ...: Williams Dam Water Power Project. f. Location: At the existing Williams dam owned by the Indiana Department...; or at (978) 283-2822. Alan Topalian, Regulatory Attorney, Free Flow Power Corporation, 239 Causeway... proposed Williams Dam Water Power Project would be located in Lawrence County, Indiana at the...

  17. 33 CFR 110.56 - Noroton Harbor, Darien, Conn.

    Science.gov (United States)

    2010-07-01

    ... the shoreline around the easterly and northerly sides of Pratt Island, the westerly and northerly... the north; thence along the downstream side of the causeway and dam to the easterly side of the Darien River, thence along the easterly shoreline to the point of beginning. Note: An ordinance of the town...

  18. 33 CFR 100.701 - Special Local Regulations; Marine Events in the Seventh Coast Guard District

    Science.gov (United States)

    2010-07-01

    ... offshore from Virginia Key, South of Seaquarium, Miami, Florida. Holiday Boat Parade of the Palm Beaches... South Pyrotechnics Atlantic Ocean, 1,000 ft offshore from Hollywood, Florida; All waters from the... nautical mile south of Rickenbacker Causeway, Miami, Florida. Deerfield Beach Super Boat...

  19. Roberts Bank: Ecological crucible of the Fraser River estuary

    Science.gov (United States)

    Sutherland, Terri F.; Elner, Robert W.; O'Neill, Jennifer D.

    2013-08-01

    Roberts Bank, part of the Fraser River delta system on Canada's Pacific coast, is a dynamic estuarine environment supporting important fisheries as well as internationally significant populations of migratory shorebirds. The 8000 ha bank environment comprises a complex of riparian boundaries, intertidal marshes, mud and sand flats, eelgrass meadows, macroalgae and biofilms. Anthropogenic developments (a ferry causeway in 1961 and a port causeway in 1969) have been responsible for changes in tidal flow patterns, tidal elevation, sediment transport and the net expansion of eelgrass beds. The goals of the present study were to (1) directly compare geotechnical properties spanning each side of the coalport causeway, and (2) enhance our understanding of the intercauseway ecosystem under a high-resolution sampling design. Sediment properties (grain size, porosity, organic content, and chlorophyll) and biological communities (eelgrass, macrofauna (0.5-1.0 mm) and meiofauna (0.063-0.5 mm)) were surveyed in 1997 at three stations outside the intercauseway area and three lateral transects spanning the intercauseway tidal flat at tidal heights representing three different habitats: biofilm, Zostera japonica, and Zostera marina. A fine-silt organic-rich porous deposit was observed on the shoreward north side of the coalport causeway relative to the south counterpart, suggesting that consolidation and erosion processes could likely not keep pace with the deposition of Fraser River silt. High chlorophyll levels were found in the protected shoreward northern border of the ferry causeway where fine sands dominate and higher water transparency exists, owing to the redirection of the silt-laden river plume by the coalport causeway. Principle Components Analysis revealed a positive relationship between these porous, organic-rich sediments and cumacean abundance in all regions where eelgrass was absent, including the north side of the coalport causeway. Further, a positive

  20. Density-stratified flow events in Great Salt Lake, Utah, USA: implications for mercury and salinity cycling

    Science.gov (United States)

    Naftz, David L.; Carling, Gregory T.; Angeroth, Cory; Freeman, Michael; Rowland, Ryan; Pazmiño, Eddy

    2014-01-01

    Density stratification in saline and hypersaline water bodies from throughout the world can have large impacts on the internal cycling and loading of salinity, nutrients, and trace elements. High temporal resolution hydroacoustic and physical/chemical data were collected at two sites in Great Salt Lake (GSL), a saline lake in the western USA, to understand how density stratification may influence salinity and mercury (Hg) distributions. The first study site was in a causeway breach where saline water from GSL exchanges with less saline water from a flow restricted bay. Near-surface-specific conductance values measured in water at the breach displayed a good relationship with both flow and wind direction. No diurnal variations in the concentration of dissolved (total and MeHg loadings was observed during periods of elevated salinity. The second study site was located on the bottom of GSL where movement of a high-salinity water layer, referred to as the deep brine layer (DBL), is restricted to a naturally occurring 1.5-km-wide “spillway” structure. During selected time periods in April/May, 2012, wind-induced flow reversals in a railroad causeway breach, separating Gunnison and Gilbert Bays, were coupled with high-velocity flow pulses (up to 55 cm/s) in the DBL at the spillway site. These flow pulses were likely driven by a pressure response of highly saline water from Gunnison Bay flowing into the north basin of Gilbert Bay. Short-term flow reversal events measured at the railroad causeway breach have the ability to move measurable amounts of salt and Hg from Gunnison Bay into the DBL. Future disturbance to the steady state conditions currently imposed by the railroad causeway infrastructure could result in changes to the existing chemical balance between Gunnison and Gilbert Bays. Monitoring instruments were installed at six additional sites in the DBL during October 2012 to assess impacts from any future modifications to the railroad causeway.

  1. Characterization of Optical and Associated Properties of Marine Colored Dissolved Organic Material (CDOM)

    Science.gov (United States)

    2016-06-14

    Principal Investigator: Dr. Catherine D. Clark Division of Marine and Atmospheric Chemistry Rosenstiel School of Marine and Atmospheric Science ... Science ,4600 Rickenbacker Causeway,Miami,FL,33149 8. PERFORMING ORGANIZATION REPORT NUMBER 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10...characterize soil and riverine humic substances (Beckett et al., 1987). Separation relies on the molecular diffusion coefficient i.e. molecular size. FFFF

  2. Navy Public Works Administration.

    Science.gov (United States)

    1980-06-01

    Navy a barrel and a half of oil. Additionally, the low sulfur con- tent of solid waste makes it less of an air polutant than most coal or fuel oils...916 -pk PREFACE The Navy can best accomplish its mission if ships and air - craft are ready and able to perform as designed, and...34public works": air fields; ammunition storage facilities; amphibious pontoon equipment; bridges and causeways; buildings (including furniture and fixed

  3. Comments on Symmetric and Asymmetric Structures of Hurricane Boundary Layer in Coupled Atmosphere-Wave-Ocean Models and Observations

    Science.gov (United States)

    2014-07-01

    author address: Dr. Jun Zhang, NOAA/AOML/ Hurricane Research Division with University of Miami/ CIMAS , 4301 Rickenbacker Causeway, Miami, FL 33149. E...suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis...S) 5d. PROJECT NUMBER 5e. TASK NUMBER 5f. WORK UNIT NUMBER 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) Naval Postgraduate School

  4. An Estimation of Turbulent Characteristics in the Low-Level Region of Intense Hurricanes Allen (1980) and Hugo (1989)

    Science.gov (United States)

    2011-05-01

    This Corresponding author address: Jun Zhang, University of Miami/ CIMAS , 4301 Rickenbacker Causeway, Miami, FL 33149. E-mail: jun.zhang@noaa.gov MAY...Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302... PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) Naval Postgraduate School,Department of Meteorology,Monterey,CA,93943 8. PERFORMING ORGANIZATION

  5. Analysis and Integration of Acoustic, Optical and Traditional Zooplankton and Mesopelagic Data from the Arabian Sea 1995 Field Program

    Science.gov (United States)

    2016-06-13

    Ortner Rosensteil School of Marine and Atmospheric Science 4600 Rickenbacker Causeway Miami, Florida 33149 Phone: (305) 361-3374 Fax: (305) 361-4392...will continue to be directed at the coupled biological and physical mechanisms controlling the distributions of planktonic organisms, the ecological...7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) University of Miami,Rosenstiel School of Marine and Atmospheric Science ,4600 Rickenbacker

  6. Coastal structural remains on the east coast of India: Evidence of maritime activities and their significance

    Digital Repository Service at National Institute of Oceanography (India)

    Tripati, S.

    , Masulipatnam and Nagapattanam. On the other hand, Dronimukha refers to a port situated near the confluence of the river and the sea. Dronimukha was also a market place. Interestingly, the ports such as Dwarka, Tondi and Puhar also had the same meaning... and these port towns had well-established markets and hinterland connections (Roy 1994). Besides the geographical considerations in the location of ports, the maritime structures such as boatbuilding yards, landing places, boat shelters, causeways, wharves...

  7. Army Logistician. Volume 41, Issue 4, July-August 2009

    Science.gov (United States)

    2009-08-01

    Army Retail Supply System (SARSS), and Property Book Unit Supply Enhanced (PBUSE) and are supported by the very small aperture ter- minal (VSAT), and...Transportation and Logistics Systems (2 credits) SCM 702: Procurement and Supplier Management (2 credits) SCM 704: Information Systems for...J. Cloutier and Brian K. Frank 50 Lightweight Modular Causeway System : Logistics Advanced Concept Technology Demonstration—Margaret A. Deming 52

  8. Aspects of the biology of Salicornia bigelovii torr. In relation to a proposed restoration of a wind-tidal flat system on the South Texas, USA Coast

    Science.gov (United States)

    Onuf, C.P.

    2006-01-01

    Wind-tidal flats are the dominant coastal wetland type in southern Texas USA. Succulent vascular plants are colonizing the flats in some locations, often where past dredge disposal along navigation channels and other activities have interrupted natural water communication between hypersaline bays and large areas of wind-tidal flats. The objective of this study was to test the feasibility of proposed removal of a causeway at Laguna Atascosa National Wildlife Refuge to restore the historic hydrologic regime and eradicate encroaching vascular plants, mostly Salicornia bigelovii, on the assumption that high sediment salt excluded these vascular plants under natural conditions. Assessment in spring 1998 of the density of Salicornia in relation to elevation and sediment salt of bare and vegetated zones on the vegetated flats on one side of the causeway and entirely barren flats with unimpaired connection to Laguna Madre on the other side of the causeway suggested that sediment salt >0.1 g ml-1 excluded vascular plants. However, bimonthly sampling in 1999-2000 revealed that sediment salt concentrations were >0.1 g ml-1 throughout the vegetated zone in July and more locally in the period of winter low water, with little impairment to established plants. This indicates that if control is desired, it must be exerted at germination and early establishment during and after fall high water. Continuous monitoring of water levels on either side of the causeway suggests that, even with removal of the causeway, flooding with hypersaline lagoon water will be too infrequent to counteract the freshening effect of a permanent hydraulic connection to the main agricultural drain of the lower Rio Grande Valley that has developed at the other end of the salt flat. Monitoring Salicornia distribution over six years documented huge variation between years but no trend toward increasing dominance of the flats. The results of this study illustrate that the most obvious alterations to a site may

  9. Masdar City: a critical retrospection

    DEFF Research Database (Denmark)

    Jensen, Boris Brorman

    2014-01-01

    Dubai appeared - at least until the financial crisis - to be leading the construction race and has already completed a large number of its landmark architecture and strategic facilities. In contrast, cities like the Qatari capital Doha still appear to be heavily ‘under construction’ and in countries...... infrastructure such as global container ports, free zones, inter-island causeways and metro lines. This volume argues that these endeavours are not simply part of a strategy to prepare for the post-oil era for future economic survival and prosperity in the Lower Gulf region, but that they are also aiming...

  10. Hydraulics and Stability of Five Texas Inlets.

    Science.gov (United States)

    1981-01-01

    8217~~r 0.38 .. , q . P . I Pleasure Pier 7 Morgan’s Point 2 South Jetty 8 Railroad Causeway N 1. 3 Teuas City Dike 9 Chocolate Bayou A 4 Manna Reel 10 Son...Range and Level.............15 III HYDRAULICS AND STABILITY OF SPECIFIC INLETS...................... 15 1. Brazos River-Freeport Harbor Entrance...g acceleration of gravity K Keulegan repletion coefficient k wave number L channel length Le effective channel length n Manning’s coefficient P

  11. The Dendrochronological Dating of Timber Crossings in West Jutland, Denmark

    DEFF Research Database (Denmark)

    Daly, Aoife

    2006-01-01

    The dendrochronological analyses of a large number of timbers from two sites are described. Nybro causeway in west Jutland, Denmark, which was built in the 8th century AD, consists of numerous phases, identifiable due to the large number of dendrochronologically dated timbers, of which many had...... complete sapwood, to bark edge, preserved. Skjern Bridge, across the Skjern River and also in west Jutland, is medieval in date, with phases from the 12th to 14th centuries. The bridge is one element in a complex of activity by the river including an earlier ford, a fish weir contemporary with the bridge...

  12. Lash Transported Anchor for a Tanker Mooring.

    Science.gov (United States)

    1980-09-01

    including additional model tests, is needed. The anchor configurations presented in Figures llb and llc will function adequately for the ATTF on all...causeways at sea) and offshore oil companies (mating jacket type structures at sea). 4. A suitable anchor for rock would be twice as heavy (4,000 kips) as the...NIARINF FNVIRON. LAW .. IIAIVl’RN): Seattle "A (E. ianger): Sceittle. %%A.’ Itransportation, ( oust rUCtIo & CO1m IN %IR(.IN IA INST. OF- MARINE SOI

  13. Risk factors and spatial distribution of Schistosoma mansoni infection among primary school children in Mbita District, Western Kenya.

    Directory of Open Access Journals (Sweden)

    Sachiyo Nagi

    2014-07-01

    Full Text Available An increasing risk of Schistosoma mansoni infection has been observed around Lake Victoria, western Kenya since the 1970s. Understanding local transmission dynamics of schistosomiasis is crucial in curtailing increased risk of infection.We carried out a cross sectional study on a population of 310 children from eight primary schools. Overall, a total of 238 (76.8% children were infected with S. mansoni, while seven (2.3% had S. haematobium. The prevalence of hookworm, Trichuris trichiura and Ascaris lumbricoides were 6.1%, 5.2% and 2.3%, respectively. Plasmodium falciparum was the only malaria parasite detected (12.0%. High local population density within a 1 km radius around houses was identified as a major independent risk factor of S. mansoni infection. A spatial cluster of high infection risk was detected around the Mbita causeway following adjustment for population density and other potential risk factors.Population density was shown to be a major factor fuelling schistosome infection while individual socio-economic factors appeared not to affect the infection risk. The high-risk cluster around the Mbita causeway may be explained by the construction of an artificial pathway that may cause increased numbers of S. mansoni host snails through obstruction of the waterway. This construction may have, therefore, a significant negative impact on the health of the local population, especially school-aged children who frequently come in contact with lake water.

  14. Management and control of pollution in Inner Johore Strait.

    Science.gov (United States)

    Koh, H L; Lim, P E; Midun, Z

    1991-10-01

    Coastal waters in South Johore, Malaysia are polluted to various degrees. The major pollution sources are domestric wastes from human settlements, agro-based wastes from palm oil mills and rubber processing factories, industrial effluents from industrial estates and discharges from animal farms. These pollution problems have adversely affected resources such as fisheries, recreational potential as well as the general aesthetic quality of the coastal environment particularly the Inner Johore Strait. Hence proper management and control measures are urgently needed to protect and further enhance the water quality to ensure environmentally sustainable development. This study examines various management options to control the pollution in the Inner Johore Strait. The options involve partial opening as well as complete removal of the Causeway to improve the tidal flow for more effective dilution and dispersion of pollutants. Computer simulation models are used to assess the impacts of the proposed options.

  15. The pursuit of perfect packing

    CERN Document Server

    Weaire, Denis

    2000-01-01

    In 1998 Thomas Hales dramatically announced the solution of a problem that has long teased eminent mathematicians: what is the densest possible arrangement of identical spheres? The Pursuit of Perfect Packing recounts the story of this problem and many others that have to do with packing things together. The examples are taken from mathematics, physics, biology, and engineering, including the arrangement of soap bubbles in foam, atoms in a crystal, the architecture of the bee''s honeycomb, and the structure of the Giant''s Causeway. Using an informal style and with key references, the book also includes brief accounts of the lives of many of the scientists who devoted themselves to problems of packing over many centuries, together with wry comments on their efforts. It is an entertaining introduction to the field for both specialists and the more general public.

  16. The architectonic encoding of the minor lunar standstills in the horizon of the Giza pyramids.

    Science.gov (United States)

    Hossam, M. K. Aboulfotouh

    The paper is an attempt to show the architectonic method of the ancient Egyptian designers for encoding the horizontal-projections of the moon's declinations during two events of the minor lunar standstills, in the design of the site-plan of the horizon of the Giza pyramids, using the methods of descriptive geometry. It shows that the distance of the eastern side of the second Giza pyramid from the north-south axis of the great pyramid encodes a projection of a lunar declination, when earth's obliquity-angle was ~24.10°. Besides, it shows that the angle of inclination of the causeway of the second Giza pyramid, of ~13.54° south of the cardinal east, encodes the projection of another lunar declination when earth's obliquity-angle reaches ~22.986°. In addition, it shows the encoded coordinate system in the site-plan of the horizon of the Giza pyramids.

  17. A preliminary survey of marine contamination from mining-related activities on Marinduque Island, Philippines: porewater toxicity and chemistry results from a field trip, October 14-19, 2000

    Science.gov (United States)

    Carr, R. Scott; Nipper, Marion; Plumlee, Geoffrey S.

    2001-01-01

    measurement of porewater concentrations of several heavy metals associated with copper mining activities. Pore waters for toxicological and chemical analyses were collected at several stations on the coast of Marinduque, near the mouths of the Boac and Mogpog rivers, and near the causeways formed by mine tailings disposal. Porewater samples were also collected at the Tres Reyes Marine Reserve, so that these non-contaminated samples could serve as a reference for test performance. Sea urchin embryological development and fertilization were only significantly impaired by two porewater samples, suggesting the presence of contaminants in toxic amounts at those stations. The toxic samples were collected near the up current side of the Calancan (Marcopper) mine tailings causeway (stations 2 and 3 – see figure 10). The pore water from station 2 also had the highest levels of heavy metals, particularly cadmium, cobalt, copper, nickel, lead and zinc (Table 5). The concentrations of cobalt, nickel and zinc were also elevated 2 at station 3. Copper concentrations were also elevated at the two river mouth stations (8 and 9) and near the CMI tailings causeway (station 7). Visual observations also indicated biological degradation due to heavy siltation and smothered coral at a gradient off the Calancan causeway, suggesting that siltation might also be causing a physical impact. This preliminary survey suggests that effects related to past mining activities are still evident and warrant a more comprehensive study to assess their severity and areal extent.

  18. Las Pozas (Casaseca de las Chanas, Zamora: dos nuevos recintos de fosos calcolíticos en el Valle del Duero

    Directory of Open Access Journals (Sweden)

    García García, Marcos

    2013-06-01

    Full Text Available Since 1975 the site of Las Pozas has given its name to the prebeaker horizon in the Spanish Northern Plateau. In the last decade several causewayed enclosures dated to this period have been discovered. This new situation has led us to revise the foundation site using remote sensing techniques. The infrared images have allowed us to distinguish two overlapping enclosures at Las Pozas: a north one with three interrupted ditches and a southern group composed of two circles. This paper describes the characteristics of both enclosures using as well the information provided by the 1979 and 1987 excavations. We believe this discovery certifies that causewayed enclosures were a common feature in the Douro Valley during the Copper Age.Desde 1975 el yacimiento de Las Pozas ha dado nombre al horizonte precampaniforme de la Submeseta Norte de la Península Ibérica. En la última década se han localizado varios recintos de fosos adscritos a este periodo que han motivado una revisión del yacimiento fundacional utilizando técnicas de teledetección. Las imágenes de infrarrojo han permitido distinguir en Las Pozas dos recintos de fosos superpuestos: el septentrional con tres líneas de foso y el meridional con dos. En este artículo se describen las características de ambos empleando la información revelada por las excavaciones de 1979 y 1987. Consideramos que el hallazgo certifica que este tipo de yacimientos no son una excepción en el Calcolítico del Valle del Duero.

  19. Sedimentology of Coastal Deposits in the Seychelles Islands—Evidence of the Indian Ocean Tsunami 2004

    Science.gov (United States)

    Nentwig, Vanessa; Bahlburg, Heinrich; Monthy, Devis

    2015-03-01

    The Seychelles, an archipelago in the Indian Ocean at a distance of 4,500-5,000 km from the west coast of Sumatra, were severely affected by the December 26, 2004 tsunami with wave heights up to 4 m. Since the tsunami history of small islands often remains unclear due to a young historical record, it is important to study the geological traces of high energy events preserved along their coasts. We conducted a survey of the impact of the 2004 Indian Ocean tsunami on the inner Seychelles islands. In detail we studied onshore tsunami deposits in the mangrove forest at Old Turtle Pond in the Curieuse Marine National Park on the east coast of Curieuse Island. It is thus protected from anthropogenic interference. Towards the sea it was shielded until the tsunami in 2004 by a 500 m long and 1.5 m high causeway which was set up in 1909 as a sediment trap and assuring a low energetic hydrodynamic environment for the protection of the mangroves. The causeway was destroyed by the 2004 Indian Ocean Tsunami. The tsunami caused a change of habitat by the sedimentation of sand lobes in the mangrove forest. The dark organic rich mangrove soil (1.9 Φ) was covered by bimodal fine to medium carbonate sand (1.7-2.2 Φ) containing coarser carbonate shell fragments and debris. Intertidal sediments and the mangrove soil acted as sources of the lobe deposits. The sand sheet deposited by the tsunami is organized into different lobes. They extend landwards to different inundation distances as a function of the morphology of the onshore area. The maximum extent of 180 m from the shoreline indicates the minimum inundation distance to the tsunami. The top parts of the sand lobes cover the pneumatophores of the mangroves. There is no landward fining trend along the sand lobes and normal grading of the deposits is rare, occurring only in 1 of 7 sites. The sand lobe deposits also lack sedimentary structures. On the surface of the sand lobes numerous mostly fragmented shells of bivalves and

  20. Discovering the Ancient Maya from Space

    Science.gov (United States)

    Sever, T. L.

    2008-01-01

    The Pet6n region of northern Guatemala contains some of the most significant Mayan archeological sites in Latin America. It was in this region that the Maya civilization began, flourished, and abruptly disappeared. Remote sensing technology is helping to locate and map ancient Maya sites that are threatened today by accelerating deforestation and looting. Thematic Mapper, IKONOS, and QuickBird satellite, and airborne STAR-3i and AIRSAR radar data, combined with Global Positioning System (GPS) technology, are successfully detecting ancient Maya features such as sites, roadways, canals, and water reservoirs. Satellite imagery is also being used to map the bajos, which are seasonally flooded swamps that cover over 40% of the land surface. Through the use of various airborne and satellite sensor systems we have been able to detect and map ancient causeways, temples, reservoirs, and land forms, and locate these features on the ground through GPS technology. Recently, we have discovered that there is a strong relationship between a tropical forest vegetation signature in satellite imagery and the location of archeological sites. We believe that the use of limestone and lime plasters in ancient Maya construction affects the moisture, nutrition, and plant species of the surface vegetation. We have mapped these vegetation signatures in the imagery and verified through field survey that they are indicative of archeological sites. Through the use of remote sensing and GIS technology it is possible to identify unrecorded archeological features in a dense tropical forest environment and monitor these cultural features for their protection.

  1. Overseas Voter Mobilisation in Singapore: Implications from Malaysia’s 13th General Election

    Directory of Open Access Journals (Sweden)

    James Gomez

    2013-01-01

    Full Text Available This paper discusses voter mobilisation and other election-related activities of Malaysian voters living, studying and working in Singapore in the context of Malaysia’s 13th general election (GE13. According to the World Bank, nearly 400,000 Malaysians reside in the city-state. Thus these figures represent a significant Malaysian voter pool based in Singapore. Efforts to mobilise these voters for general elections or other causes have political implications for both countries, which became apparent following Singapore-based Malaysians’ activities to encourage Malaysians to return home to cast their votes during the 13th general election. Singapore’s strict public assembly laws led to several legal issues related to the voter mobilisation and election campaign activities undertaken by Malaysians in the city-state. These legal issues became a source of friction between the two countries during the elections as government leaders and authorities on both sides of the causeway accused the other of interfering in domestic political matters. Given the growing number of Malaysians in Singapore and the likely repeat of Malaysian voter mobilisation activities in Singapore in the run-up to the fourteenth general election (GE14 in 2018, issues related to the election activities of Malaysian voters in Singapore stand to be another set of factors that will shape the health of bilateral relations between these two countries.

  2. An evaluation of temporal changes in sediment accumulation and impacts on carbon burial in Mobile Bay, Alabama, USA

    Science.gov (United States)

    Smith, Christopher G.; Osterman, Lisa E.

    2014-01-01

    The estuarine environment can serve as either a source or sink of carbon relative to the coastal ocean carbon budget. A variety of time-dependent processes such as sedimentation, carbon supply, and productivity dictate how estuarine systems operate, and Mobile Bay is a system that has experienced both natural and anthropogenic perturbations that influenced depositional processes and carbon cycling. Sediments from eight box cores provide a record of change in bulk sediment accumulation and carbon burial over the past 110 years. Accumulation rates in the central part of the basin (0.09 g cm−2) were 60–80 % less than those observed at the head (0.361 g cm−2) and mouth (0.564 g cm−2) of the bay. Sediment accumulation in the central bay decreased during the past 90 years in response to both anthropogenic (causeway construction) and natural (tropical cyclones) perturbations. Sediment accumulation inevitably increased the residence time of organic carbon in the oxic zone, as observed in modeled remineralization rates, and reduced the overall carbon burial. Such observations highlight the critical balance among sediment accumulation, carbon remineralization, and carbon burial in dynamic coastal environments. Time-series analysis based solely on short-term observation would not capture the long-term effects of changes in sedimentation on carbon cycling. Identifying these relationships over longer timescales (multi-annual to decadal) will provide a far better evaluation of coastal ocean carbon budgets.

  3. The Western Australian Police Headquarters Building: Surveillance, Power and the Authoritarian State

    Directory of Open Access Journals (Sweden)

    Jon Stratton

    2013-02-01

    Full Text Available There has been little cultural studies work concerned with Perth’s built environment. This contribution examines a building that has been a focus in the distribution of governmental power across Perth and Western Australia more generally. The building that until recently housed the Western Australian Police Headquarters was opened in 1975. It stands at Perth’s eastern gateway looking outwards across the River Swan and the Causeway which crosses it. The use of the Police Headquarters building spanned the time during which Western Australia’s economy became increasingly dependent on mining and other resource-related extraction industries. During this same time Western Australia’s government became increasingly authoritarian. This essay argues that the Police Headquarters building can be understood as expressing this authoritarian shift. One element of this can be found in the building’s use of the International Style. At the same time, and consonant with this transformation, the positioning and form of the building enabled a structure of surveillance which has been a key aspect of modern government.

  4. Seasonal variability in the surface sediments of Mobile Bay, Alabama, recorded by geochemistry and foraminifera, 2009–2010

    Science.gov (United States)

    Umberger, D.K.; Osterman, L.E.; Smith, C.G.; Frazier, J.; Richwine, K.A.

    2012-01-01

    A study was undertaken in order to document and quantify recent environmental change in Mobile Bay, Alabama. The study was part of the Northern Gulf of Mexico (NGOM) Ecosystem Change and Hazard Susceptibility project, a regional project funded by the Coastal and Marine Geology Program to understand how natural forcings and anthropogenic modifications influence coastal ecosystems and their susceptibility to coastal hazards. Mobile Bay is a large drowned-river estuary that has been modified significantly by humans to accommodate the Port of Mobile. Examples include repeated dredging of a large shipping channel down the central axis of the bay and construction of a causeway across the head of the bay and at the foot of the bayhead delta. In addition to modifications, the bay is also known to have episodic periods of low oxygen (hypoxia) that result in significant mortality to fish and benthic organisms (May, 1973). For this study a series of surface sediment samples were collected. Surface benthic foraminiferal and bulk geochemical data provide the modern baseline conditions of the bay and can be used as a reference to changing environmental parameters in the past (Osterman and Smith, in press) and into the future. This report archives data collected as part of the Mobile Bay Study that may be used in future environmental change studies.

  5. Final Gondwana breakup: The Paleogene South American native ungulates and the demise of the South America-Antarctica land connection

    Science.gov (United States)

    Reguero, Marcelo A.; Gelfo, Javier N.; López, Guillermo M.; Bond, Mariano; Abello, Alejandra; Santillana, Sergio N.; Marenssi, Sergio A.

    2014-12-01

    The biogeographic hypothesis more accepted today is that Antarctica (West Antarctica) and southern South America (Magellan region, Patagonia) were connected by a long and narrow causeway (Weddellian Isthmus) between the Antarctic Peninsula and South America since the Late Cretaceous (Campanian) until the Early Paleogene allowing terrestrial vertebrates to colonize new frontiers using this land bridge. Stratigraphically calibrated phylogenies including large, terrestrial native ungulates Litopterna and Astrapotheria taxa reveal long ghost lineages that extended into the Late Paleocene and provide evidence for the minimum times at which these "native ungulates" were present both on Antarctica and South America. Based on these results we estimate that the Weddellian Isthmus was functional as a land bridge until the Late Paleocene. Our data place the disconnection between Antarctica and South America in the Late Paleocene, indicating that the terrestrial faunistic isolation (Simpson's "splendid isolation") in South America begun at the end of the Paleocene (~ 56 to 57 m.y.). This faunistic isolation is documented to have occurred at least 25 Ma before the existence of deep-water circulation conditions in Drake Passage (~ 30 m.y.) based on the onset of seafloor spreading in the west Scotia Sea region. We hypothesize that in the early stages of extension (Late Paleocene, ~ 55 m.y.) a wide and relatively shallow epicontinental sea developed between the Antarctic Peninsula and South America drowning the Weddellian Isthmus and preventing the faunal interchange for obligate cursorial terrestrial forms.

  6. Google Earth: Inspiration and Instrument for the Study of Ancient Civilizations

    Directory of Open Access Journals (Sweden)

    Jaroslav Klokočník

    2011-12-01

    Full Text Available Satellite imaging is well known as a useful tool in many scientific disciplines and various applications.  Google Earth, with its free access, is now - thanks to increasing resolution and precision - such a tool. It can be very inspiring. It improves the visualization and dissemination of scientific data, and opens doors to new discoveries. For example, many Nasca geoglyphs are now visible to Google Earth and so are the orientations of Chinese pyramids, which appear to be laid out with the aid of a magnetic compass. Google Earth also infor-med us about the “new” archaeological locality Atzompa close to the well known “Monte Alban” near Oaxaca (Mexico, which we then visited (in March 2010. Google Earth can also “see” prehistoric causeways in Mesoamerica, “sacbeob” and in the Chaco valley (New Mexico. We find that Google Earth can save time and resources to researches significantly: before, during and after field works and measurements; we present examples.

  7. The Writing on the Wall: National and Global Implications of the Ruling Chinese Communist Party’s Domestic and Foreign Policies

    Directory of Open Access Journals (Sweden)

    Emile Kok-Kheng Yeoh

    2016-04-01

    Full Text Available The December 2015 crackdown on labour activists was the culmination of a year of the Chinese Communist Party regime’s war on China’s civil society kicked off with the arrests of the “Feminist Five” in March, followed by the infamous crackdown on civil rights lawyers that began on 5th July and lasted till August. At around the same time, from mid-October to end of December 2015, five owners and staff members of Hong Kong’s Mighty Current publishing company and Causeway Bay bookshop which respectively publishes and sells politically dissident books banned by China disappeared under mysterious circumstances (including one while vacationing in Pattaya, Thailand, and another while inspecting warehouse in Hong Kong and reemerged in mainland China under the custody of the Chinese authorities. While these volatile incidents were unfolding domestically, the year also witnessed the continued rise of China’s economic might in the global system. With specific focus on the latest events unfolding from year 2015 to the present, this paper attempts to interpret such developments especially in terms of government policies with respect to the State’s relations with the civil society since the leadership transition from Hu-Wen to Xi-Li administration, the implications of the global reach of China’s economic might and soft power in this regard, as well as the current nature of the governing regime of the Chinese Communist Party.

  8. Studies Concerning Heat-Resisting Additives for Bitumens

    Directory of Open Access Journals (Sweden)

    Livia Groll

    2008-01-01

    Full Text Available The improvement of causeway’s bitumen adhesiveness is becoming a current practice in our country, especially when is used acid (siliceous aggregate. One of the most important properties of bitumen is its adhesiveness to aggregate, and this property determine the using of bitumen in causeways area. Usually the adhesiveness is defined as the capacity of a binder to cover an aggregate without dispersing itself when touching the water or the traffic aggressions. Therefore, the adhesiveness additives are products that improve the adhesiveness of the bitumen to a certain aggregate. The used additives – ADETEN type (A01 and A03 have a high stocking stability, a low toxicity degree toward the amine, diamine, polyamine-based additives and are liquid products perfectly compatible with all bitumens and easy to use, in comparison to the paste or solid additives, which must be made liquid to be used. But a very important condition, which must be fulfilled by these promoters is the heat-resisting condition.

  9. The Writing on the Wall: National and Global Implications of the Ruling Chinese Communist Party’s Domestic and Foreign Policies

    Directory of Open Access Journals (Sweden)

    Emile Kok-Kheng Yeoh

    2016-04-01

    Full Text Available The December 201 5 crackdown on labour activists was the culmination of a year of the Chinese Communist Party regime’s war on China’s civil society kicked off by of the arrests of the “Feminist Five” in March followed by the infamous crackdown on civil rights lawyers that began on 5th July and lasted till August. At around the same time, from mid-October to end of December 2015, five owners and staff members of Hong Kong’s Mighty Current publishing company and Causeway Bay bookshop which respectively publishes and selling politically dissident books banned by China disappeared under mysterious circumstances (including one while vacationing in Pattaya, Thailand, and another while inspecting warehouse in Hong Kong and reemerged in mainland China under the custody of the Chinese authorities. While these volatile incidents were unfolding domestically, the year also witnessed the continued rise of China’s economic might in the global system. With specific focus on the latest events unfolding from year 2015 to the present, this paper attempts to interpret such developments especially in terms of government policies with respect to the State’s relations with the civil society since the leadership transition from Hu-Wen to Xi-Li administration, the implications of the global reach of China’s economic might and soft power in this regard, as well as the current nature of the governing regime of the Chinese Communist Party.

  10. Eco-engineered rock pools: a concrete solution to biodiversity loss and urban sprawl in the marine environment

    Science.gov (United States)

    Firth, Louise B.; Browne, Keith A.; Knights, Antony M.; Hawkins, Stephen J.; Nash, Róisín

    2016-09-01

    In coastal habitats artificial structures typically support lower biodiversity and can support greater numbers of non-native and opportunistic species than natural rocky reefs. Eco-engineering experiments are typically trialed to succeed; but arguably as much is learnt from failure than from success. Our goal was to trial a generic, cost effective, eco-engineering technique that could be incorporated into rock armouring anywhere in the world. Artificial rock pools were created from manipulated concrete between boulders on the exposed and sheltered sides of a causeway. Experimental treatments were installed in locations where they were expected to fail and compared to controls installed in locations in which they were expected to succeed. Control pools were created lower on the structure where they were immersed on every tidal cycle; experimental pools were created above mean high water spring tide which were only immersed on spring tides. We hypothesised that lower and exposed pools would support significantly higher taxon and functional diversity than upper and sheltered pools. The concrete pools survived the severe winter storms of 2013/14. After 12 months, non-destructive sampling revealed significantly higher mean taxon and functional richness in lower pools than upper pools on the exposed side only. After 24 months the sheltered pools had become inundated with sediments, thus failing to function as rock pools as intended. Destructive sampling on the exposed side revealed significantly higher mean functional richness in lower than upper pools. However, a surprisingly high number of taxa colonised the upper pools leading to no significant difference in mean taxon richness among shore heights. A high number of rare taxa in the lower pools led to total taxon richness being almost twice that of upper pools. These findings highlight that even when expected to fail concrete pools supported diverse assemblages, thus representing an affordable, replicable means of

  11. Annual report to Parliament on the administration and enforcement of the fish habitat protection and pollution prevention provisions of the Fisheries Act for the period of April 1, 1996 to March 31, 1997

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1998-12-31

    The habitat protection and pollution provisions of the Canadian Fisheries Act are designed for the protection and conservation of fish habitat. Section 35 of the Act prohibits any project that would cause the harmful alteration, disruption or destruction of fish habitat, unless authorized by the Department of Fisheries and Oceans (DFO). This report describes the administration and enforcement procedures of the Fisheries Act during the fiscal year 1996-1997. The three partners that play an important role in the conservation of fisheries and fish habitat are the provinces, territories and First Nations. A summary of policy issues which faced the Habitat Program in 1996-97 are described. The report also describes the Fraser River Action Plan and the St. Lawrence Vision 2000. Both these programs are designed to improve the environmental health and productivity of the watersheds. A number of other projects which have the potential to impact fish and fish habitat are also discussed. Among these Voisey`s Bay mine development in Labrador, an oil transshipment facility in Placentia Bay, Newfoundland, the Star Lake Hydroelectric development in central Newfoundland, the fish passage problem at Petitcodiac Causeway in New Brunswick, the fixed link project in Northumberland Strait, the Kemess South and Huckleberry Copper/Gold mines in British Columbia, developments on the Columbia River in British Columbia, diamond drilling in the Northwest Territories, the Cheviot Mine in Alberta, roads built through the Sunpine Forest in Alberta, and uranium mines in Elliot Lake, Ontario and in Saskatchewan are briefly described as examples of projects requiring involvement by Fisheries and Oceans Canada. 6 tabs.

  12. Forest Resources, Chiefdoms and Mortuary Practices in the Neotropics: Preliminary Archaeobotanical Analysis from El Caño Funerary Complex (Coclé Province, Panamá)

    Science.gov (United States)

    Martín Seijo, M.; Torné, J. Mayo; Torné, C. Mayo; Huerta, R. Piqué i.

    2012-04-01

    El Caño site is situated on the Pacific side of Panamá, near the Río Grande. It's a funerary complex comprising different types of structures (stone structures -basalt columns, groups of sculptures and a causeway-; earthen mounds and canals; burials). The excavations supervised by Julia Mayo between 2008 and 2011 allowed to discover several lavish burials estimated to date between 700 and 1000 AD (Mayo & Mayo 2012). The data recovered has served as source of information for the pre-Columbian chiefdoms and their mortuary practices. There was carried out a detailed taphonomic study to register the complex formation processes of these burial deposits, and the significant post-depositional transformations (anthropogenic and natural processes) (Mayo & Mayo in press). Also during the excavations were recovered archaeobotanical samples; most of them charcoals. The laboratory work process consisted in the exhaustive description of the anatomical features of the different taxa identified during the charcoal analyses (the identification level varied from species to family, although in several case we couldn't propose any taxa). These samples were concentrated in structures, and in few cases dispersed in the sediment. Some of the samples analyzed were large pieces of charcoal of the wooden beams from ancient wood structures, and other pieces of charcoal and vegetable fibers were related directly with the burial practices. The charcoal analysis results aim to contribute to the knowledge of the exploitation of forest resources, of the territories where these resources were collected, and of the production process (chaîne opératoire). These results were complemented with the exhaustive review of written sources (spanish chronicles), ethnobotanical studies and archaeological data of other sites in this area. Acknowledgements: This research was developed under El Caño Archaeological Project and was funded by SENACYT (Secretaría Nacional de Ciencia y Tecnología de Panamá).

  13. Application of Sediment Trend Analysis in the Examination of Sediment Transport Dynamics of Missisquoi Bay

    Science.gov (United States)

    Kraft, M. P.; Manley, P.; Singer, J.; Manley, T.; McLaren, P.

    2013-12-01

    Missisquoi Bay is located between Vermont and Quebec in the northeast sector of the Restricted Arm of Lake Champlain. The average depth of the Bay is slightly less than 3 meters with a surface area covering 77.5 km2. The Bay receives water from eastern and western catchment basins, most notably via the Missisquoi, Rock, and Pike Rivers. Circulation within Missisquoi Bay has been altered by the construction of railroad causeways in the late 19th century and highway construction in the early 20th century. Over the past several decades there have also been changes in land-use practices, including the intensification of agriculture, increased animal husbandry, and urbanization. As a consequence of construction and changing land use, loadings of nitrogen and phosphorus to the Bay have increased seasonal oxygen depletion causing eutrophication. Since monitoring began in 1992, Missisquoi Bay has displayed the highest mean total phosphorus concentrations and chlorophyll a concentrations in Lake Champlain. Various efforts have taken place to reduce nutrient loading to Missisquoi Bay, but persistent release of phosphorus from bottom sediments will continue to delay for decades the recovery from nutrient diversion. To better understand the causes and timing of eutrophication in Missisquoi Bay, one component of a 5-year integrated VT EPSCoR - RACC program included an examination of N and P loadings and their distribution throughout the Bay. Internal circulation patterns are also being studied. To determine the pattern of net sediment transport and determine sediment behavior (erosion and accretion), a Sediment Trend Analysis (STA) was performed using 369 grab samples collected in the Bay. Grain size distributions for the surface sediment samples were determined using a Malvern Mastersizer 2000 particle size analyzer. Sediment maps showing the proportion of gravel, sand, and mud show that near major river distributaries sand-sized sediment was dominant with muds becoming more

  14. Multi-method Assessment of the Braided Planform Stability - Toklat River, Alaska

    Science.gov (United States)

    Adema, G. W.; Podolak, C.

    2011-12-01

    Maintaining infrastructure in the vicinity of a dynamic braided river is a challenging, yet necessary activity in Alaska and it requires some understanding of likely future river planform configurations. The intersection of the 150-kilometer-long gravel road which carries all of the traffic in the Denali National Park, AK, with the Toklat River, draining the north side of the glaciated Alaska Range, highlights several of these challenges. Immediately downstream from two bridges and a causeway crossing the 800-meter-wide braid plain, park infrastructure (a rest stop and a maintenance facility) is being threatened by bank erosion. In order to better protect this section of the park the National Park Service sought a geomorphic assessment of the Toklat River from the USGS. The assessment of likely planform configurations was conducted with a four-method approach - analyzing 1) channel patterns in the downstream direction, 2) changes in the lateral slope of the braidplain over time, 3) influences on the geometry of a significant tributary junction, and 4) probable post-avulsion channel configurations. This suite of analyses based on a series of cross section surveys and a large airborne LiDAR dataset were carried out using MATLAB, Quick Terrain Modeler, and ArcGIS. Patterns in the down- and cross-valley slopes, the braid plain width, and the cross-sectional forms demonstrate persistent forcings on the channel planform. Temporal trends in the cross section surveys, photographic evidence, and vegetation patterns show a braidplain that is regularly reworked. Relative discharge was estimated from two basins using a USGS-developed empirical method. The discharge was used along with confluence geometry constrain likely planform patterns downstream of a significant tributary junction. A simple momentum-based model showed a likely persistence of the current planform. The LiDAR-derived topography was used in a probabilistic analysis of likely avulsion scenarios and the likely

  15. Estimating the impacts of oil spills on polar bears

    Science.gov (United States)

    Durner, George M.; Amstrup, Steven C.; McDonald, Trent L.

    2000-01-01

    The polar bear is the apical predator and universal symbol of the Arctic. They occur throughout the Arctic marine environment wherever sea ice is prevalent. In the southern Beaufort Sea, polar bears are most common within the area of the outer continental shelf, where the hunt for seals along persistent leads and openings in the ice. Polar bears are a significant cultural and subsistence component of the lifestyles of indigenous people. They may also be one of the most important indicators of the health of the Arctic marine environment. Polar bears have a late age of maturation, a long inter0brth period, and small liter sizes. These life history features make polar bear populations susceptible to natural and human perturbations.Petroleum exploration and extraction have been in progress along the coast of northern Alaska for more than 25 years. Until recently, most activity has taken place on the mainland or at sites connected to the shore by a causeway. In 1999, BP Exploration-Alaska began constructing the first artificial production island designed to transport oil through sub-seafloor pipelines. Other similar projects have been proposed to begin in the next several years.The proximity of oil exploration and development to principal polar bear habitats raises concerns, and with the advent of true off-shore development projects, these concerns are compounded. Contact with oil and other industrial chemicals by polar bears, through grooming, consumption of tainted food, or direct consumption of chemicals, may be lethal. The active ice where polar bears hunt is also where spilled oil may be expected to concentrate during spring break-up and autumn freeze-up. Because of this, we could expect that an oil spill in the waters and ice of the continental shelf would have profound effects on polar bears. Assessments of the effects of spills, however, have not been done. This report described a promising method for estimating the effects of oil spills on polar bears in the

  16. Anthropogenic influences on the input and biogeochemical cycling of nutrients and mercury in Great Salt Lake, Utah, USA

    Energy Technology Data Exchange (ETDEWEB)

    Naftz, David [US Geological Survey, Salt Lake City 84119, UT (United States)], E-mail: dlnaftz@usgs.gov; Angeroth, Cory; Kenney, Terry [US Geological Survey, Salt Lake City 84119, UT (United States); Waddell, Bruce; Darnall, Nathan [US Fish and Wildlife Service, Salt Lake City, UT (United States); Silva, Steven [US Geological Survey, Menlo Park, CA (United States); Perschon, Clay [Utah Division of Wildlife Resources, Salt Lake City, UT (United States); Whitehead, John [Utah Department of Environmental Quality, Salt Lake City, UT (United States)

    2008-06-15

    Despite the ecological and economic importance of Great Salt Lake (GSL), little is known about the input and biogeochemical cycling of nutrients and trace elements in the lake. In response to increasing public concern regarding anthropogenic inputs to the GSL ecosystem, the US Geological Survey (USGS) and US Fish and Wildlife Service (USFWS) initiated coordinated studies to quantify and evaluate the significance of nutrient and Hg inputs into GSL. A 6 per mille decrease in {delta}{sup 15}N observed in brine shrimp (Artemia franciscana) samples collected from GSL during summer time periods is likely due to the consumption of cyanobacteria produced in freshwater bays entering the lake. Supporting data collected from the outflow of Farmington Bay indicates decreasing trends in {delta}{sup 15}N in particulate organic matter (POM) during the mid-summer time period, reflective of increasing proportions of cyanobacteria in algae exported to GSL on a seasonal basis. The C:N molar ratio of POM in outflow from Farmington Bay decreases during the summer period, supportive of the increased activity of N fixation indicated by decreasing {delta}{sup 15}N in brine shrimp and POM. Although N fixation is only taking place in the relatively freshwater inflows to GSL, data indicate that influx of fresh water influences large areas of the lake. Separation of GSL into two distinct hydrologic and geochemical systems from the construction of a railroad causeway in the late 1950s has created a persistent and widespread anoxic layer in the southern part of GSL. This anoxic layer, referred to as the deep brine layer (DBL), has high rates of SO{sub 4}{sup 2-} reduction, likely increasing the Hg methylation capacity. High concentrations of methyl mercury (CH{sub 3}Hg) (median concentration = 24 ng/L) were observed in the DBL with a significant proportion (31-60%) of total Hg in the CH{sub 3}Hg form. Hydroacoustic and sediment-trap evidence indicate that turbulence introduced by internal waves

  17. Estimation of Selenium Loads Entering the South Arm of Great Salt Lake, Utah, from May 2006 through March 2008

    Science.gov (United States)

    Naftz, David L.; Johnson, William P.; Freeman, Michael L.; Beisner, Kimberly; Diaz, Ximena; Cross, VeeAnn A.

    2009-01-01

    Discharge and water-quality data collected from six streamflow-gaging stations were used in combination with the LOADEST software to provide an estimate of total (dissolved + particulate) selenium (Se) load to the south arm of Great Salt Lake (GSL) from May 2006 through March 2008. Total estimated Se load to GSL during this time period was 2,370 kilograms (kg). The 12-month estimated Se load to GSL for May 1, 2006, to April 30, 2007, was 1,560 kg. During the 23-month monitoring period, inflows from the Kennecott Utah Copper Corporation (KUCC) Drain and Bear River outflow contributed equally to the largest proportion of total Se load to GSL, accounting for 49 percent of the total Se load. Five instantaneous discharge measurements at three sites along the railroad causeway indicate a consistent net loss of Se mass from the south arm to the north arm of GSL (mean = 2.4 kg/day, n = 5). Application of the average daily loss rate equates to annual Se loss rate to the north arm of 880 kg (56 percent of the annual Se input to the south arm). The majority of Se in water entering GSL is in the dissolved (less than 0.45 micron) state and ranges in concentration from 0.06 to 35.7 micrograms per liter (ug/L). Particulate Se concentration ranged from less than 0.05 to 2.5 ug/L. Except for the KUCC Drain streamflow-gaging station, dissolved (less than 0.45 um) inflow samples contain an average of 21 percent selenite (SeO32-) during two sampling events (May 2006 and 2007). Selenium concentration in water samples collected from four monitoring sites within GSL during May 2006 through August 2007 were used to understand how the cumulative Se load was being processed by various biogeochemical processes within the lake. On the basis of the Mann-Kendall test results, changes in dissolved Se concentration at the four monitoring sites indicate a statistically significant (90-percent confidence interval) upward trend in Se concentration over the 16-month monitoring period. Furthermore

  18. Anthropogenic influences on the input and biogeochemical cycling of nutrients and mercury in Great Salt Lake, Utah, USA

    Science.gov (United States)

    Naftz, D.; Angeroth, C.; Kenney, T.; Waddell, B.; Darnall, N.; Silva, S.; Perschon, C.; Whitehead, J.

    2008-01-01

    Despite the ecological and economic importance of Great Salt Lake (GSL), little is known about the input and biogeochemical cycling of nutrients and trace elements in the lake. In response to increasing public concern regarding anthropogenic inputs to the GSL ecosystem, the US Geological Survey (USGS) and US Fish and Wildlife Service (USFWS) initiated coordinated studies to quantify and evaluate the significance of nutrient and Hg inputs into GSL. A 6??? decrease in ??15N observed in brine shrimp (Artemia franciscana) samples collected from GSL during summer time periods is likely due to the consumption of cyanobacteria produced in freshwater bays entering the lake. Supporting data collected from the outflow of Farmington Bay indicates decreasing trends in ??15N in particulate organic matter (POM) during the mid-summer time period, reflective of increasing proportions of cyanobacteria in algae exported to GSL on a seasonal basis. The C:N molar ratio of POM in outflow from Farmington Bay decreases during the summer period, supportive of the increased activity of N fixation indicated by decreasing ??15N in brine shrimp and POM. Although N fixation is only taking place in the relatively freshwater inflows to GSL, data indicate that influx of fresh water influences large areas of the lake. Separation of GSL into two distinct hydrologic and geochemical systems from the construction of a railroad causeway in the late 1950s has created a persistent and widespread anoxic layer in the southern part of GSL. This anoxic layer, referred to as the deep brine layer (DBL), has high rates of SO42 - reduction, likely increasing the Hg methylation capacity. High concentrations of methyl mercury (CH3Hg) (median concentration = 24 ng/L) were observed in the DBL with a significant proportion (31-60%) of total Hg in the CH3Hg form. Hydroacoustic and sediment-trap evidence indicate that turbulence introduced by internal waves generated during sustained wind events can temporarily mix the

  19. Interaction between shallow groundwater, saline surface water and nutrient discharge in a seasonal estuary: the Swan-Canning system

    Science.gov (United States)

    Linderfelt, William R.; Turner, Jeffrey V.

    2001-09-01

    The Swan and Canning Rivers converge to form an estuary that is seasonally forced by wet winter and dry summer conditions. The estuary is also tidally forced due to its contact with the Indian Ocean. The perception that the occurrence of nuisance algal blooms has increased in frequency and severity in recent years has prompted the present investigation into the interaction of the shallow groundwater system with the Swan-Canning Estuary. The extent to which this interaction contributes to nutrient delivery to the river is a focus of the work.Groundwater interaction with the upper reaches of the Swan River is shown to occur at three length scales: (i) the scale of the river-bed sediments (i.e. 1000 m). Two-dimensional groundwater flow modelling in plan covering the regionally advected groundwater flow domain of the upper Swan River Estuary from the Causeway to Guildford shows that there is a net groundwater discharge to the Swan River of groundwater discharge of about 80 000 m3/day, or about 29 million m3/year. Between 1987 and 1996, the average surface tributary inflow to the Swan River was about 460 million m3/year. Thus groundwater discharge contributed approximately 6% of the total annual river flow. This percentage is clearly small in comparison to the total river flow. However, in the six months from November to April in summer, tributary flow into the Swan River declines sharply to an average total of approximately 12 million m3. Groundwater discharge during this six-month period is approximately 14 million m3 or about 55% of the surface tributary flow, and thus groundwater is a significant component of the total inflow to the Swan-Canning Estuary during this period. Nutrient concentrations, particularly ammonium, within the sediment pore fluids underlying the river are very high relative to concentrations in the river, such that groundwater discharge rates of this magnitude are capable of introducing significant nutrient loadings to the river. The nitrogen

  20. PREFACE: Kelvin and Ireland

    Science.gov (United States)

    Flood, Raymond; McCartney, Mark; Whitaker, Andrew

    2009-07-01

    frequent visitor. While the most celebrated example of his engineering work was his massive contribution to the Atlantic telegraph cable, and his maritime and other inventions were used throughout the world, he was especially pleased to contribute to two important technical accomplishments in the north of Ireland, the occulting Holywood lighthouse and the Giant's Causeway tramway. Kelvin's interest in Ireland came again to the fore in the Home Rule debate at the end of the nineteenth century; Kelvin was vehemently opposed to Home Rule and became a passionate member of the Liberal Unionist party, a crucial factor in his becoming a peer. Accounts of these aspects of Kelvin's involvement with Ireland are given in our first four papers. The fifth paper was particularly appropriate for the meeting. It describes how an important contribution of Kelvin on optimal packing has been improved in Ireland by the speaker, Denis Weaire, himself, and how the result has been seen by the whole world in Beijing. Finally there is a discussion of Kelvin's place in the story of Irish science. There have been many highly accomplished Irish scientists, and the meeting showed clearly that Kelvin certainly deserves to be included among the greatest. Acknowledgments The meeting was the second regional event of the Institute of Physics (IOP) in Ireland, the first being the meeting on John Desmond Bernal: Science and Society held in Limerick in June 2006 and published in the same series as this volume. The meeting also benefited from the support of many bodies and institutions. We would like to thank the committee of the IOP in Ireland for providing finance and also giving their full support. We would particularly mention Vincent Casey, the Chair, who also chaired the afternoon session, Emma Sokell, the Secretary, and Denise Gabuzda and Kevin McGuigan, past and present Treasurers. We would also thank Sheila Gilheany and Alison Hackett for general help and encouragement, including assisting the

  1. The Costa Maya:  Evolution of a Touristic Landscape La Costa Maya : évolution d'un paysage touristique La Costa Maya : evolución de un paisaje turístico

    Directory of Open Access Journals (Sweden)

    Klaus J. Meyer-Arendt

    2010-06-01

    ecotourism.  Development so far has been concentrated in Puerto Costa Maya, where a cruise ship pier and terminal were built in 2001.  The nearby beach resort (balneario of Majahual became dependent upon the 10-12 shiploads of tourists that descended upon it every week.  In spite of big development plans, the more remote beaches of the Costa Maya cater to fewer, but well-heeled ecotourists and dive tourists.  Hurricane Dean made landfall in August 2007 as a category-5 storm, and economic recovery only began in late 2008 when the cruise ship pier re-opened and Majahual rebuilt.  As of late 2009, the cruise-ship traffic had still not recovered to pre-Dean levels, and a global recession coupled with swine-flu and drug violence scares has lowered U.S. tourism to Mexico.  To what degree new tourism infrastructure such as an international airport at Tulum, a proposed causeway from Chetumal to the beach, and a new resort complex at Xahuayxel will stimulate tourism on the Mexican Costa Maya and eventually lead to a coastal highway link with San Pedro, Belize is still unknown.

  2. Editorial: Is This Any Way to Develop Policy?

    Directory of Open Access Journals (Sweden)

    Michael H. Miner

    2007-06-01

    investigation. Nor were they enacted after considering what the empirical research available in the mid to late 1990’s told us about sexual crimes and the effectiveness of sexual offender treatment. They were enacted to respond to public outcry following terrible, but anomalous, incidents. In fact, while each new law was justified by the high risk posed by repeat sex offenders, the empirical data indicated that at the time these laws were enacted, the rates of child sexual abuse were declining in the United States (Finkelhor & Jones, 2006 and the risk posed by convicted, identified sexual offenders was, and currently remains, actually quite low – ranging from a high of 24% (Harris & Hanson, 2004 to 5.3% (Bureau of Justice Statistics, 2003.The above process continues, unabated, here in the United States. We keep coming up with new ideas, such as residence restrictions, which have resulted in parolees in Florida living under a causeway and registered sexual offenders in Iowa living at interstate rest stops. Such residences would appear to increase public risk, rather than protect the public. Sex offender treatment, in such circumstances, would certainly appear to be a waste of time and resources, in that individuals concerned about where they can live and whether they can get a job, are in no place to work on the types of issues addressed by most treatment interventions. However, with each new heinous incident, our law makers do not appear to consider the possibility that the already enacted legislation is at best useless and at worst iatrogenic, they simply assume that the laws are not strict enough and must be “strengthened.” Thus, we in the U.S.A find ourselves in an environment where sexual offenders are society’s worst villains (although that might change now that our Federal government seems more focused on terrorists, they are all the same, and they will always be dangerous. Any suggestion that this is not the case, even though all of the available data indicate