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 63 for “"Sediment flux"”.
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Seasonal precipitation, river discharge, and sediment flux in the western Himalaya
… known about the triggers and sources of peak sediment flux events, which account for extensive hydropower reservoir filling and turbine abrasion. We therefore lack basic information on the distribution of water resources and controls of erosion processes. In this thesis, I employ various …
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Reconstructing long term sediment flux from the Brooks Range, Alaska, using edge clinoforms
… clinoform volume (32,400 km3) were simulated. Sediment flux, marine and nonmarine diffusivities, and basin subsidence were systematically varied until a match was found for the foreset and topset slopes, as well as progradation rates over a 6 million year period. The ability of STRATA to match …
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Reconstructing long term sediment flux from the Brooks Range, Alaska using shelf edge clinoforms
… clinoform volume (32,400 km3) were simulated. Sediment flux, marine and nonmarine diffusivities, and basin subsidence were systematically varied until a match was found for the foreset and topset slopes, as well as progradation rates over a 6 milion year period. The ability of STRATA to match …
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Sustainable Land-Use Management for the Conservation of the Freshwater Pearl Mussel: Sediment Flux and Provenance
… (FPM) populations are believed to be diffuse sediment losses associated with agriculture and forestry. The contribution of anthropogenic activity to river sediment load is of increasing global concern (Duerdoth et al. (2015). Excessive sedimentation of watercourses can reduce habitat quality, …
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Evaluation on an on-site stormwater treatment device for sediment flux mitigation in the Lake Tahoe basin
… water runoff, which includes pollutants such as sediment, nutrients, metals, microorganisms, and organic compounds. Sediment is of particular importance because many pollutants are readily 5 adsorbed onto particles. In the Lake Tahoe basin, sediment is also significant because of its direct …
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Climate-induced trends in global riverine water discharge and suspended sediment dynamics in the 21st century
… distribution, altering fluvial processes such as sediment dynamics and riverine water discharge, worldwide. Changes in the magnitude of fluvial water and sediment fluxes can have profound impacts on the functioning and connectivity of earth’s natural systems. This study is focused on isolating the …
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Simulating Anthropogenic and Climatic Influences On Fluvial Sediment Load In the Southeastern U.S. and Central Europe
<p>Quantifying variable riverine sediment discharge over time in response to climate and human pressure is crucial to understanding past, present and future patterns of sediment flux to the worlds' oceans. The need for this data is critical in light of changing anthropogenic activities, global …
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Late quaternary climate changes and landscape evolution in the Northwest Himalaya : geomorphologic processes in the Indian Summer Monsoon Domain
… barriers that are normally arid. There, sediment flux, mean basin denudation rates, and channel-forming processes such as erosion by debris-flows increased significantly. Similarly, during the late Pleistocene and early Holocene, solar forcing increased the strength of the Indian summer …
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Modeling the Effects of Low-Pressure Atmospheric Fronts on Sediment Transport through Mississippi Sound Barrier Island Inlets
<p>Coastal sediment dynamics in the Mississippi Sound are strongly influenced by tropical cyclones and the more frequent passage of low-pressure atmospheric fronts. While hurricanes are well recognized for reshaping barrier islands and altering sediment budgets, the cumulative role of recurrent …
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Observations and modeling of sand transport in a wave dominated environment
Observations of bedforms, suspended sediment and water velocities were used to examine sediment transport processes at the sandy LE0-15 site located off the New Jersey coast. The bedforms were observed during storms using a rotary sidescan sonar and were found to be wave orbital scale ripples. The …
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Tectonic Exhumation and Climate Driven Erosion in Extensional Mountain Blocks: Two Examples from California, USA
… climate plays in modulating erosion and mass fluxes from extensional mountains blocks to sedimentary basins over 104-5 yr timescales is debated. In the eastern California-Walker Lane shear zone, exposures of sedimentary basin fill allow inversion of erosion- and sediment-flux rates from a …
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Equilibrium and transient morphologies of river networks : discriminating among fluvial erosion
… variables play an important role in determining sediment transport rates, and their mutual adjustment to a change in the forces that drive erosion can yield surprising results. Adjustments in grain size can lead to spatially variable channel concavity and larger trans port rates on shallower …
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Feedback between erosional morphology, sediment transport and abrasion in the transient adjustment of fluvial bedrock channels
… dependence of bedrock channel incision on coarse sediment supply through laboratory flume experiments and quantitative field observations of evolving channel morphology. Predictions of the saltation-abrasion model (Sklar and Dietrich, 2004) for sediment flux-dependent channel incision guide our …
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Methane Dynamics in St. Louis Bay, Mississippi
… The mass balance equations allowed simpler fluxes of the estuary to be measured, while complex fluxes were calculated. The total methane inventory of St. Louis Bay was found to vary between 900-7000 moles. The dominant sink was found to be air-sea flux, which varied between 4000-100,000 …
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Accelerated settling of particulate matter by ’marine snow’ aggregates
Samples from time-series sediment traps deployed in three distinct oceanographic settings (North Pacific, Panama Basin, and Black Sea) provide strong evidence for rapid settling of marine particles by aggregates. Particle water column residence times were determined by measuring the time lag …
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Spectral fingerprinting
… the need for an improved understanding of sediment dynamics. This involves the accurate assessment of erosion rates and sediment transfer, yield and origin. A variety of methods exist to capture these processes at the catchment scale. Among these, sediment fingerprinting, a technique to …
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The Impacts of Climate and Landscape Change on Catchment Scale Material Transport in High Mountain and Seasonally Cold Regions
… changes necessarily impact the ways in which sediment and other solutes are delivered through stream systems. This dissertation investigates material fluxes at the watershed scale in high mountain and seasonally cold regions in an effort to better understand the processes impacting their …
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Effects of human development on aeolian sediment transport rates within an adjacent undeveloped backshore enclave
… development. Conditions for foredune growth and sediment flux within an enclave can be influenced by the presence of adjacent buildings. The objectives of this research are to assess the following questions: what is the nature of sediment flux on a beach within an enclave, what are the potential …
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Quantifying overwash flux in barrier systems : an example from Martha’s Vineyard, Massachusetts, USA
… interval of ~28 years, resulting in an onshore sediment flux of 2.4—3.4 m3/m/yr. The third washover was deposited by a nor’easter in January 1997, which has a water level return interval of ~6 years, resulting in a flux of 8.5 m3/m/yr. These fluxes are smaller than the flux of sediment needed to …
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