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Showing 1 to 20 of 23 for “"sediment movement"”.
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Flow and sediment movement in stepped channels
… and clear water flow, clear water scour, and sediment transport tests undertaken for a range of discharges and channel slopes. Three distinct flow regimes were observed for the clear water flow and clear water scour tests. They were stable tumbling flow, unstable tumbling flow, and shooting …
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A computational fluid dynamics model for sediment movement based on the unit stream power approach
… to define the incipient motion criteria for the sediment particles by comparing the available applied stream power with the individual particle power requirements for motion (Rooseboom 1992). The Movability Number (Lui 1957), which represents the shear velocity-settling velocity ratio, is related …
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Analysis of the Sediment Transport Capabilities of FESWMS FST2DH
<p>Many numeric models simulate the transport of sediment within rivers and streams. Engineers use such models to monitor the overall condition of a river or stream and to analyze the impact that the aggradation and degradation of sediment has on the stability of bridge piers and other features …
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A Novel Method of Determining Sediment Transport using Ultrasonic Wireless Sensors
… shoreline, coastal processes and in particular sediment movement, given the dynamic nature of coastal systems, is vital to ensure that erosion response is appropriate. Ideally, monitoring should take place regularly over long periods with data collected for both the visible beach and submerged …
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Experimental study of internal gravity waves over a slope
… a criterion for incipient motion of bottom sediment induced by shoaling internal waves. The maximum sediment sizes that can be placed into motion, according to this criterion, are larger than certain mean sediment sizes on the continental margin off New England. This suggests that internal …
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Assessment of Sediment Runoff from Natural Gas Well Development Sites.
Storm water sediment runoff from disturbed landscapes has the potential to impair aquatic environments. Small construction sites of 1-5 acres in the United States are currently regulated by the United States Environmental Protection Agency to minimize storm water runoff damages to the environment. …
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The Effects of Benthic Organisms on Intertidal Sediment Erodibility
… disturbance recovery. The erosion of surface sediments is also vital to benthic-pelagic coupling, where resuspended microbes and organic material become available to suspension feeders and/or transported to adjacent habitats. On sandflats, the organisms living within sediments have been proven …
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Development of an optical fibre array fluorosensor for monitoring in the aqueous environment.
… dye tracer was used in applications such as sediment movement in harbours, sewage effluent monitoring and water discharges from oil platforms in the North Sea. The system was found to have a detection limit of 10-9 M and 10-8 M respectively for Fluorescein and Rhodamine ‘B’. The OFAF offers …
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Distribution of Invasive Plant Species on Debris Cones at Mount Rainier National Park
… associated geomorphic processes to facilitate movement within the park. Vegetation transects were performed along Stevens Canyon Road (to observe the roadside community composition) and on the debris cone features (to observe species movement from the roadside). These vegetation observations …
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Construction Site Sedimentary Pollution in a Watershed
<p>In the study of sediment pollution on and near a construction site, it is necessary to remember that sediment movement and deposition are part of the natural environment before the intervention of construction. As with many hydrologic problems, most sedimentation problems have visual impacts for …
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Quantitative geomorphology and hydrology of the Cass River Basin, New Zealand
… in high-angle fans along the sides of the basin. Sediment movement is highest in areas of positive groundwater pressure and lowest in areas of negative groundwater pressure. </p><p>Computer programs were used to handle the data from the quantitative sediment and hydrologic studies. The …
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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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Interaction among vegetation and morphology in channelized rivers
… flow structure and consequently flow resistance, sediment transport, morphology, and ecology. These influences would lead to a hydraulic diversity, which is a key ingredient of physical habitat in streams. According to this fact, vegetation is commonly incorporated within stream restoration. …
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Textual characteristics of coarse sediments in selected streams of the Niagara Peninsula, Ontario
… are paved by coarse carbonate and sandstone sediments which have originated from the escarpment units and can be traced downstream from their source. Fifty-nine sediment samples were taken from five streams, over distances of 3,000 to 10,000 feet (915 to 3050 m), to determine downstream …
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Spatio-temporal analysis of coastal sediment erosion in Cape Town through remote sensing and geoinformation science
… of coastal environments and in particular, sediment movement. Cape Town, in particular; is socioeconomically diverse and spatially segregated, with heavy dependence on its 240km of coastline. It faces sea level rise intensified by real-estate development close to the high-water mark and on …
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Investigation of hydrologic and sediment transport processes on riparian hillslopes
… the distribution, nature, and rate of water and sediment movement through these zones. The intent of this research was to investigate the influence of site conditions on the hydrologic and sediment transport response of riparian zones/hillslopes. Research investigations were focused in two major …
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Characterization of the basal hydraulic system of a surge-type glacier : Trapridge Glacier, 1989-92
… develop a theoretical model that describes the movement of water, induced by response tests, in a coupled borehole—subglacial flow layer. The model encompasses a broad range of flow regimes, from laminar Darcian flow in a thick permeable unit to turbulent sheet flow in a very thin layer. …
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Lagrangian observations and numerical modelling of hydrodynamics, turbulence, and sediment transport in a tidal river
… transporting materials, including nutrients and sediments, from land to ocean. These riverine environments located close to estuaries constitute complex dynamical systems, which are affected by the influences of both tidal variations from downstream and freshwater inputs from upstream, with the …
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Improved dynamics modelling for drainage sediment prediction and management
… in this thesis aims to further knowledge of sediment behaviour and provides engineers with appropriate tools and methods to facilitate proactive sediment management. The techniques developed during this investigation are therefore able to predict the locations and quantities of sediment …
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