Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 39 for “"fine sediments"”.
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Dispersion of fine sediments in tides
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1998.
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Size Measurement of Fine Sediments By Electrical Resistance
… exists between the settling velocities of the fine particles of sediments and the change in resistance to the flow of electricity through a fluid containing the sediments. It was assumed that the sediments would behave according to Stokes’ Law regarding the velocities of their settling, and the …
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How do fine sediments and Hangman Creek discharge affect benthic macroinvertebrates in the Spokane River?
… common causes of stream degradation globally is fine sediment deposition. Most fine sediment deposition in stream beds is generated by land use practices such as timber harvest, agriculture and urbanization. Hangman Creek is a major tributary and source of fine sediment to the Spokane River. …
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Experimental study on the response of fine sediments to wave agitation and associated wave attenuation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1989.
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The Geomorphic Influence of Agricultural Land Use on Stream Hydraulics and Biological Function
… Such disturbances often result in increased fine sediment input to the stream along with direct changes in channel structure. The study described here was designed to quantify stream geomorphic changes associated with agriculture and their influence on reach scale transient storage hydraulics …
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Fine sediment effects on brook trout egg and alevin survival in Virginia
Detailed information about negative effects of fine sediments on early life stages of brook trout (Salvelinus fontinalis) in southern Appalachian streams is lacking. Information on survival to different stages of egg and alevin development could indicate critical timing of sediment impacts. This …
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The Accuracy of River Bed Sediment Samples
… and wildlife can be expected when excessive fine sediments enter a stream. Many chemicals and toxic materials are transported through streams by binding to fine sediments. Increases in fine sediments also seriously impact the survival of fish species present in the stream. Fine sediments fill …
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Downstream suspended sediment dynamics of reservoir sediment flushing
… Nevertheless, flushing of the accumulated sediments downstream of the dam also bears numerous negative impacts. In this study, first the most important downstream impacts of fine sediment releases of flushing were identified based on previously published research of twenty case studies in …
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Fractionation & segregation of suspended particles using acoustic and flow fields
… technologies. Decontamination and separation of fine sediments is useful in treating sediments. The application of acoustic standing wave fields for the fractionation and segregation of suspended particles was studied. The above technology was implemented at the bench scale by building a …
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Quantifying distribution and transport of contaminated sediments in the St. Clair River: The GIS approach (Ontario, Michigan).
… accidental spills from a massive complex of refineries and chemical facilities located on the Canadian shore of the St. Clair River, south of the City of Sarnia, a variety of toxic chemicals have accumulated in bottom sediments. The highest level of contamination was consistently found in the …
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Integrated impact analysis of yellow-dust storms : a regional case study in China
… semi-arid regions, transporting a thick cloud of fine sediments. In China, the sediments of dust storms mainly come from the desert and thus are called "yellow-dust storms." Although these storms can disrupt socioeconomic activities widely and pose hazards to human health as well as to the …
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Hydrodynamic processes and their impacts on the mud deposit in the Southern Yellow Sea, China
… processes the pathways and control mechanisms of fine sediment transport and check against the deposition rate determined from the core analysis so as to establish the links between sediment supply, accumulation, and dynamics for the deposits. <br/>It is found that the fine sediments discharged …
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Effects of urbanization on instream habitat and fish assemblages in the chattanooga metropolitan area, Tennessee-Georgia
… were characterized by increased proportions of fine sediments and pool areas, coupled with reduced variation in channel complexity. Urbanized watersheds exhibited declines in biotic integrity, species diversity, richness and evenness. Watershed urbanization was also correlate d with declines of …
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Preferential mode of gas invasion in sediments : grain-scale model of coupled multiphase fluid flow and sediment mechanics
… in the sediment, and show that coarse-grain sediments favor capillary invasion, whereas fracturing dominates in fine-grain media. The results have important implications for understanding vent sites and pockmarks in the ocean floor, deep sub-seabed storage of carbon dioxide, and gas hydrate …
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Mercury distribution in the sediments of the South River, Virginia
… to determine the distribution of mercury in the sediments of the South River for 16 km. below a synthetic fibers plant in Waynesboro, Virginia, which discharged mercury to the river system from 1929 to 1950. The downstream distribution was examined by comparing the results of total mercury …
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Do Muds Sort? Experimental Test of a Hypothesis Key to Understanding Marine Bottom Currents
Accumulations of fine sediments in deep-ocean contourites form a sedimentary record that has been hypothesized to be directly related to bottom-current behavior. This is known as the 'sortable silt' hypothesis and states that the non-cohesive, coarse silt in the 10 to 63 µm size range within a …
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Impacts of Land-Use on Leaf Breakdown and Macroinvertebrate Assemblages in Southern Appalachian Streams
… related to discharge (white oak) and some fine sediment metrics (red maple). Our results suggest that the altered hydrological regimes in agricultural streams, as well as the influx of fine sediments into streams from exurban development, can play a role in altering in-stream organic matter …
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Nematofauna da planície de maré de Coroa Grande, Baía de Sepetiba, RJ
… were recorded for the first time in Brazilian sediments. The faunal composition was not very different from other similar habitats. Diversity patterns were influenced by the sedimentological characteristics of the environment, especially, the amount of fine sediments. Diversity values found on …
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Modeling Soil Erosion in the Upper Green River, KY
… throughout the United States, contributing sediments to channels mainly as nonpoint pollution resulting from land-use and agricultural practices and leading to sedimentation downstream and downwind, a decrease in the transport capacity of streams, increase in the risk of flooding, filling …
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