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Showing 1 to 20 of 45 for “"Fresh Water Studies"”.
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Systematics of the Freshwater Amphipod Genus <i>Crangonyx</i> (Crangonyctidae) in North America
… of the genus probably originated as very old freshwater lineage dating back at least to the Mesozoic and possibly earlier. The ancestor of modern <em>Crangonyx</em> species possibly resembled C. forbesi and separated from the common ancestor of <em>Synurella</em> and <em>Crangonyx</em> …
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Phytoplankton Ecology and Dynamics in the James River Estuary Virginia, U. S. A.
… conductivity) in order to determine the fate of fresh water phytoplankters upon being advected into the estuary because of their suspected role in the biogeochemical cycling that occurs there.</p> <p>Both chlorophyll a and the production of particulate organic carbon in the very low salinity …
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Cytotoxicity and Mutagenicity of Disinfection Byproduct Mixtures Formulated Using Free Chlorine and Monochloramine
… to assess various toxicity endpoints of drinking water disinfection byproducts (DBPs), but an emphasis on single compounds prevails. In this research, DBP mixtures were assessed using a cytotoxicity test with Chinese Hamster Ovary (CHO) cells and an Ames fluctuation test with Salmonella …
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Subsurface controls on mainland marsh shoreline response during barrier island transgressive submergence
<p>Many recent studies have sought to understand the response of barrier islands and their attendant marshes to sea level rise. The Mississippi River delta plain, specifically the Chandeleur Islands and associated interior wetlands in eastern Louisiana, serves as an excellent natural laboratory for …
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Geochemical Behavior of the Rare Earth Elements in Natural Terrestrial Waters
… and organic ligands in natural terrestrial waters; (2) the geochemical behavior of REEs along the groundwater flow paths in two different aquifer types (i.e., sand vs. carbonate); and (3) surface complexation behavior of REEs in the Carrizo Sand aquifer. In the first manuscript, a solution …
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Factors Effecting Phytoplankton Assemblages in the Lafayette River Estuary
<p>Chemical and physical parameters were measured with phytoplankton species composition and abundance in the Lafayette River from August to October 1981. Stations located in four distinct areas of the river were statistically analyzed to determine data relationships. Environmental factors …
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Applications of Reservoir Limnology Theory and Steady-State Modeling to Eutrophication Management in Beaver Lake, Arkansas
… zones leading to an inverse pattern in water clarity. These theoretical patterns were utilized to create a statistical model of chlorophyll-a (Chl-a), an indicator of PB, and Secchi transparency (ST), an indicator of Chl-a, in Beaver Lake, Arkansas, a 12,800-ha reservoir, in order to …
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Mat Movement in Coastal Louisiana Marshes: Effect of Salinity and Inundation on Vegetation and Nutrient Levels
… marshes, their differing responses to open-water salinities and inundation, as well as the nutrient distribution in the porewaters and sediment. The effects of the physical differences in the two marsh types on the ocurrence of the dominant emergent vegetation was discussed.</p> <p>The main …
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Groundwater and Tidal Controls on Wetland Hydrology, Julie J. Metz Wetland Mitigation Bank, Woodbridge, Virginia
… J. Metz Wetlands Mitigation Bank, a 92-hectare freshwater wetland located in Woodbridge, Virginia, borders the tidally-influenced Neabsco Creek. Seven pods separated by earthen berms were built by Wetland Studies and Solutions Inc. (WSSI) in 1995 and 1997 by removing the toe of small sandy …
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The Effects of Varying Fresh Water Discharge on Dispersion in an Estuarine Hydraulic Model of the Lafayette River, Norfolk, Virginia
… test with an increase in the amount of fresh water discharged into the head of the river. This was done to study the response from varying river discharge on mixing parameters including the longitudinal dispersion coefficient (E).</p> <p>The model generated a tide of constant range and …
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LiDAR Assessment of Sediment Transport Related to the Removal of the Marmot Dam, Sandy River, Oregon
<p>Four Aerial LiDAR survey were used to examine the impacts of the 2007 removal of the Marmot Dam on the Sandy River, Oregon. Geomorphic Change Detection software was used to answer three project goals: 1) to investigate how the dam removal affected sediment distribution in the lower reach of the …
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Reservoir Management Techniques to Enhance Biological Productivity and Protect Water Quality
<p>Three reservoirs of similar size, watershed land use, and qualitative characteristics in northwest Arkansas, USA were selected to compare the effects of chemical fertilization and pulsed artificial-upwelling on whole-lake productivity, specifically primary production and phytoplankton biomass. …
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Non-Volatile Dissolved Organic Iodine in Marine Water
… of NaClO.</p> <p>Production of DOI in seawater can be via both non-phytoplankton and phytoplankton related processes. In the former, iodide is converted to DOI. In the latter, most likely, iodate is converted to DOI. Naturally occurring phytoplankton in shelf break water contribute more to …
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Development of a Hydrologic Model for an Urban Headwater Stream: The Influence of Pervious Surface Properties on Runoff Dynamics
… (LULC), an extensive and well-developed stormwater drainage network, and extensive urbanization (over 90% developed, and almost 50% impervious surface area (ISA)). Selected datasets provided information on the stormwater drainage network, the physical attributes of the catchment and receiving …
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