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Showing 1 to 20 of 42 for “"Sediment composition"”.
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Effect of Sediment Composition on the Uniformity of Experimentally-Formed Methane Hydrate
… regularly made non-uniform hydrate in packed sediments. Some element of the natural system is missing from the experimental procedure. The goal of this research was to discover what role sediment composition and grain size play in the uniformity of experimentally-formed methane hydrate. The …
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The relationship between sediment composition and infaunal polychaete communities along the southern coast of Namibia
This study examined the relationship between sediment structure and infaunal polychaete communities off the southern coast of Namibia from two separate sets of data, and a total of ninety-two samples. It also examined whether a selected group of organisms (polychaetes) could provide the same level …
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Multiproxy Analyses of Past Vegetation, Climate, and Sediment Dynamics in Hudson River Wetlands
… 2007, Christensen et al. 2007). Vegetation and sediment composition are two major keys that determine the health of the ecosystem. Thus, a necessary key in the restoration of the estuary is the understanding of baseline ecosystem and sedimental conditions as well as their long-term responses to …
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DYNAMIC EQUILIBRIUM BEACH PROFILES: FORCES OF OFFSHORE SEDIMENT TRANSPORT IN MARYLAND’S CHESAPEAKE BAY
… to estimate the quantity and quality of yearly sediment mass that is likely to be added by erosion. Data were collected in 2008 at ten sites along the Maryland shoreline of the Chesapeake Bay and compared to both empirical and theoretical models of offshore profiles. The data collected at each …
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Effective Mitigation of Sedimentation on Riparian Riverbeds and Salmonid Populations After Dam Removal
… is the release of large loads of impounded sediment. Sediment is known to negatively impact salmonids life cycle through increasing turbidity and causing fine sediment infiltration. A series of river erosion dam removal case studies was examined to identify if salmonid populations are …
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Identifying Key Factors Affecting Translational Landslides in Part of the Yakima Fold and Thrust Belt, Washington State
… of the Columbia River Basalts (CRBs) with loose sediment layers between them induces landslides of large blocks of bedrock. These hazards remain poorly understood, but their significance was heightened by the 2017 Rattlesnake Hills Landslide that currently threatens a community and an interstate …
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Comparative Toxicity of Eight Model Substances to the Sediment Dwelling Invertebrates Lumbriculus variegatus and Chironomus riparius
… between the environmental compartments water and sediment, since the evaluation of contaminants has historically focused on water exposition. Many anthropogenic chemicals and waste materials, including toxic organic and inorganic chemicals, adsorb to particulate matter and accumulate in sediments, …
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Sedimentology and Shallow Groundwater Responses of a Coastal Marsh Along a Salinity Gradient: A Case Study In Grand Bay National Estuarine Research Reserve, Mississippi
… factors affecting marsh hydrology, including sediment composition, seasonal variability, and coastal storms in Grand Bay National Estuarine Research Reserve (NERR) near Pascagoula, Mississippi. Analysis of sediment includes color, organic matter, carbonate, magnetic susceptibility, and …
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Gulf Sturgeon of the Pascagoula River: Post-Katrina Assessment of Seasonal Usage of the Lower Estuary
… migrations. Interpolated habitat maps of sediment composition and macrofaunal abundance reveal that this area possesses both abiotic and biotic characteristics most commonly reported for foraging Gulf sturgeon relocations from other Gulf sturgeon populations, and this area may represent …
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Sedimentary Characteristics of an Estuarine Marsh System and the Roles of Storm Overwash, Micro-tidal Currents, and Organic Production: Big Branch Marsh, Louisiana
<p>The goal of this thesis is to document sediment composition in Big Branch Marsh National Wildlife Refuge, located on the northern shore of Lake Pontchartrain in St. Tammany Parish, Louisiana, to discern the relative influences of fluvial, tidal, and storm overwash transport dynamics of a …
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CHEMICAL AND PHYSICAL ANALYSIS OF LAMINATED SEDIMENT FORMED IN LOE POOL, CORNWALL
Laminated and annually-laminated sediments are found in Loe Pool. The origins of such laminations are investigated and evidence for their conditions of formation are presented. In all sediment analysed the combustion residue was greater than 80%, and in the black and grey annually-laminated …
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The Winter Ecology of the Piping Plover (Charadrius melodus) in Coastal Georgia
… of the island. This area also had a different sediment composition (more coarse silt and very fine sand) and greater prey abundance (Nereis sp.) than other parts of the island. My results suggest that LSSI is one of the most important wintering sites on the Atlantic coast for the Piping Plover, …
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Ecological Benefits of Mitigation on a Large River Mainstem in an Intensively Mined Appalachian Watershed
… changes in channel morphology, habitat quality, sediment composition, bank stability, biological communities and organic matter processing in response to habitat enhancing structures; 2-relate changes in structural and functional attributes of the Little Coal River mainstem to losses resulting …
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Volatile chemistry, and nitrogen sources and fluxes, in subduction zones : insights from the Izu-Bonin-Mariana Arc
… convergent margin (IOCM), where the entire sedimentary sequence is subducted and where a number of parameters, including sediment composition, slab dip and slab age, vary systematically along strike of the arc. Volcanic emissions are typical of convergent margin volcanoes, and are dominated …
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Winter flounder Pseudopleuronectes americanus stock enhancement in New Hampshire: Developing optimal release strategies
… to water temperature, prey availability, and sediment composition. Optimal season was selected based on the temporal distribution, abundance, and sizes of wild flounder, and their primary prey and predators. Within the estuary, Broad Cove was chosen as the optimal release site due to high fish …
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The fisheries biology of two scallop species, Pecten maximus (l.) and Aequipecten opercularis (l.), in the waters around Shetland, Scotland.
… relation to<br/>the environmental variables of sediment composition and depth. Growth<br/>studies were carried out on juveniles to measure sub-annual growth.<br/>The gonadal condition through time in the adult stocks was assessed,<br/>changes in gonad condition were related to spawning activity …
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Organically bound tritium in sediments from the Severn Estuary, UK
… in elevated tritium (3H) activities in the sediments and biota of the estuary. A monthly sampling programme, covering February 2000 to May 2004, has provided the first detailed description of the spatial and temporal distribution of 3H activities in surface sediments from the estuary. Four …
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Spatial Trends of Non-Point Pollutants in Bottom Sediment of Lake Springfield, Southwest Missouri
Sediment quality trends can be used to identify pollution sources in lake and river systems. This study evaluates the spatial distribution of phosphorus, lead, zinc, copper, and calcium concentrations in bottom sediments of Lake Springfield to identify sources of non-point pollutants. With the …
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The Effective Viscosity of Ash-Laden Flows
… in the flow, along with other fine-grained sediment and increases the effective viscosity of the flow. The increase in effective viscosity decreases the settling velocity of the sediment within the flow, which in turn increases the bulk density of the flow. The increase in bulk density …
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