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 64 for “"Sediment dynamics"”.
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Sediment dynamics on Wemyss beach, South Fife
… a complex environment in which to examine sediment transport. The use of tracers revealed that low density coal pebbles were 'rejected' from the bedload layer of ironstone and sandstone pebbles, and were transported to extreme distances alongshore and potentially offshore. Whereas, the high …
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Downstream suspended sediment dynamics of reservoir sediment flushing
Reservoir sediment flushing is increasingly considered beneficial to reduce sedimentation of reservoirs and maintain sediment supply downstream of impounded rivers. Nevertheless, flushing of the accumulated sediments downstream of the dam also bears numerous negative impacts. In this study, first …
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Analysis of sediment dynamics in intensively managed landscapes
The flux of fine sediment within agricultural watersheds is an important factor determining the environmental quality of streams and rivers. Human activity has significantly altered the hydrological and biogeochemical cycles within terrestrial and aquatic environments through agricultural …
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Nearshore sediment dynamics in a mixed sand/mud environment
… receives significant quantities of fine, fluvial sediment from two river systems. Examining seabed geomechanical characteristics, sediment fluxes and morphological features in northern Poverty Bay provided the opportunity to study interactive processes, including sediment entrainment rates over …
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Morphodynamics, sedimentation and sediment dynamics of a gravel beach
… D50 2 - 8min), was studied with reference to its sedimentology. Three time scales were sampled for nearshore hydrodynamics, intertidal morphologies and sediirientologies. A series of surveys were carried out over individual tidal cycles (samphng every 5 - lOmins for between 6 and 91irs); on …
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From Representative Period Selection to Process‐Based Sediment Dynamics
… in which tides, waves and wind jointly govern sediment transport. Despite its ecological and morphological significance, the region remains comparatively understudied, and its typical residual and storm-driven sediment pathways are poorly understood. This thesis develops an integrated, …
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Coastal and sediment dynamics in a high-energy, rocky environment
A study of the wave dynamics, hydrodynamics and sediment dynamics was conducted at an energetic open-coast site at New Plymouth, New Zealand. The location features large, shore-normal reefs of volcanic agglomerate extending from an irregular shoreline, with “black” volcanic sands intermittently …
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Water quality and sediment dynamics in a detention pond system
An investigation into the Lake Harrison detention pond system revealed that the design enhanced the removal efficiency of total suspended solids (TSS) and, to a lesser degree, nutrient constituents in the runoff. The design increased TSS flocculation, which ensured particulate removal, and …
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Soil erosion and suspended sediment dynamics in intensive agricultural catchments
Excessive delivery of fine sediment from agricultural river catchments to aquatic ecosystems can degrade chemical water quality and ecological habitats. Management of accelerated soil losses and the transmission of sediment-associated agricultural pollutants, such as phosphorus, is required to …
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Impacts of coastal realignment on intertidal sediment dynamics: Freiston Shore, the Wash
… Wash) are investigated. The hydrodynamic and sediment dynamics over the intertidal flats and a managed realignment site are discussed, with an extensive set of hydrodynamic, sediment dynamic and geomorphological data presented. <br/><br/>The managed realignment has improved the coastal defence …
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The effects of variation in wave period and flow asymmetry in sediment dynamics
… are described, relating to aspects of hydrodynamics and sediment dynamics under second-order Stokes type waves (or flows), of varying degrees of asymmetry. The majority of the measurements related to laminar and/or transitional flow conditions and were made using an oscillating trolley …
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Sediment Dynamics and Associations with Polychlorinated Biphenyls and Dioxins in an Urban Estuary
… and dibenzofurans (PCDD/Fs, or “dioxins”) in the sediments of aquatic systems is a persistent global problem that poses serious health risks. This dissertation focuses on understanding the occurrence of PCBs and dioxins in the sediments of the Galveston Bay Estuary System (GBS) by first compiling …
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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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Large-scale floodplain sediment dynamics in the Mekong Delta : present state and future prospects
… one of the world’s most productive fisheries. Sediment dynamics play a major role for the high productivity of agriculture and fishery in the delta. However, the MD is threatened by climate change, sea level rise and unsustainable development activities in the Mekong Basin. But despite its …
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Landsliding and sediment dynamics following the 2008 Wenchuan Earthquake in the Beichuan area of China
… a need to further develop our understanding of sediment dynamics of steep mountain environments once the shaking has stopped. The 2008 Wenchuan Earthquake in China resulted in widespread landsliding, generating large volumes of loose rock and soil. Examples from other recent large earthquakes …
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The MEso-SCAle Particle Transport model (MESCAPT) for studying sediment dynamics during storms and tsunamis
… former is efficiency and the latter is detailed sediment transport and deposit information. Instead of modeling individual particles, we assume that a group of sediment grains travel and deposit together, which is called a meso-scale particle. This allows simulation domains that are large enough …
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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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