Global ETD Search
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Showing 1 to 20 of 26 for “"Sediment distribution"”.
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LiDAR Assessment of Sediment Transport Related to the Removal of the Marmot Dam, Sandy River, Oregon
… 1) to investigate how the dam removal affected sediment distribution in the lower reach of the river, several km downstream of the dam, 2) to determine whether the pulse of sediment from the dam removal created a detectable, successive downstream accumulation of sediment through time, and 3) to …
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The physical limnology and sedimentology of Miller Lake, Martin River Glacier, south-central Alaska
… is 8873 acal/cm<sup>2</sup>.</p> <p>The general sediment distribution of Miller Lake is characterized by a band of sand, gravel, and coarser material surrounding a large area composed mainly of silty clay located in the center of the lake. There are several areas of anomalous sediment …
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Modeling the sorting of sediments on delta tops
Sediment sorting in fluvial rivers produces great variation in the grain-size of deposit over the length of a river. Knowledge of the pattern of sediment deposition may help to shed light on the processes that sort by grain size. A simple geometric model was developed to predict the location of the …
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Quantifying Channel Responses to the Removal of the Glines Canyon Dam in the Middle Reach of the Elwha River, Washington
… accumulate the new influx of woody debris and sediment from the dam removal, which influenced the response of the river channel. The change that occurred was quantified by using repeat Terrestrial LiDAR (TLS), sediment distribution surveys, and large woody debris mapping techniques. The …
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Depositional Architecture of Confined Meander Belt Deposits, Lower Cretaceous Grand Rapids Formation, east-central Alberta
… framework are used to map the 3D distribution of marginal marine units and fluvial bodies. A confined fluvial meander belt in the Colony Allomember is studied in detail using a high-resolution data set of densely spaced wells and seismic time slices. Sediment distribution within …
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Sediment redistribution in the Uilkraals estuary as a consequence of human disturbance
… in estuaries has often resulted in the redistribution of sediments, which ultimately leads to detrimental impacts in these environments. The aim of this study is to investigate how the sediment distribution and dynamics within a specific estuary, the Uilkraals estuary, have been affected …
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Stratigraphy and Sedimentology of the Smackover Formation, Southwest Alabama
… and salt tectonic relief features control sediment distribution of the Smackover Formation in southwest Alabama. The Smackover in Barnett Field is entirely dolomitized, but the carbonate texture at the time of deposition is still visible in thin section. The Smackover carbonates in Barnett …
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Bottom currents and abyssal sedimentation processes south of Iceland
… geologic effects of steady bottom currents on sediments of East Katla Ridge on the southern insular rise of Iceland. Near-bottom southwest to west-flowing currents exceeded 20 cm sec-1 for two weeks over a 25-kilometer wide section of the ridge flank between approximately 1400 and 1800 meters …
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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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Sediment circulation in mixed gravel and shingle bayhead beaches on the South East Dorset coast.
… the morphological characteristics, processes and sedimentology of five local mixed gravel and shingle beaches. A conceptual framework of process response has been adopted which considers energy inputs, sediment transport and coastal morphology, under conditions of limited sediment supply and a …
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Modern sedimentation in the Northern Barents Sea : input, dipersal and deposition of suspended sediments from glacial meltwater
… to distal glaciomarine. The regional surface sediment distribution is controlled by erosion of shallow banks of the Pleistocene glaciated surface, with the fine material deposited in the deep basins. Near-bottom nepheloid layers are often observed indicating that fine grained sediments are …
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A qualitative and quantitative study of the distribution of pelagic sediment in the Atlantic Basin
Pelagic sedimentation is the primary modifier of topography generated by ridge-associated volcanic and tectonic processes. This thesis represents an effort to understand the processes of, and the general distribution of, pelagic sedimentation on rough topography, particularly in the Atlantic Basin …
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A qualitative and quantitative study of the distribution of pelagic sediment in the Atlantic Basin
Pelagic sedimentation is the primary modifier of topography generated by ridge-associated volcanic and tectonic processes. This thesis represents an effort to understand the processes of, and the general distribution of, pelagic sedimentation on rough topography, particularly in the Atlantic Basin …
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Bulle-Effect and its implications for morphodynamics of river diversions
… many of them are built to divert water and sediment from the river for various purposes. Historically, diversions were built to divert water for irrigational and navigational purposes. Recently the importance of diversions has increased, as building diversions to divert sediment (and water) …
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Medium-Term (Months to Years) Morphodynamic Modelling of a Complex Estuarine System
… demonstrated a seasonal variability in the sediment volumes within the estuary, with accretion in the relatively energetic winter periods and erosion during the quiescent summer months. The net longer-term trend over this period is accretionary with average seabed accumulation rates of 20 …
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Late Paleogene (Eocene to Oligocene) paleoceanography of the northern North Atlantic
… circulating bottom water (early Oligocene). Sediment distribution patterns provide evidence for strong contour-following bottom water flow beginning at reflector R4 time; this suggests a northern source for this bottom water, probably from the Arctic via the Norwegian-Greenland Sea and …
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Megaturbidites and the late Quaternary regional sedimentology of the eastern and central Mediterranean Sea
The late Quaternary sedimentology of the Mediterranean is controlled primarily by fluctuations in global climate and sea level, and by an overriding compressive regime between the Eurasian and African plates. Local variations in this convergence have led to marked differences in the two regions …
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Western North Dakota lignite strip mining processes and resulting subsurface characteristics
… characteristics after reclamation. The redistribution of the overburden sediments is less predictable, however.</p> <p>Through field observations, the major mining factors controlling subsurface structure and overburden sediment redistribution were determined. These include the geometry of …
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Coccoliths and oxygen isotope observations from the sediment surface of the southwest Indian Ocean
… seem to be controlling the state in which sediment material is preserved in the study area though most samples examined under the SEM were generally well preserved. The distribution of forty-four coccolithophore species in one hundred deep sea core-tops from the southwest Indian Ocean is …
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Extreme events in geoarchives
… Therefore, annually laminated (varved) lake sediments seem to be the most suitable archives since (i) lake basins act as natural sediment traps in the landscape continuously recording land surface processes including floods and (ii) individual flood events are preserved as detrital layers …
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