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Showing 1 to 20 of 43 for “"Suspended sediment concentration"”.
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Suspended sediment concentration in Alpine glacial meltwaters
Suspended sediment concentration in meltwaters draining from Alpine glaciers vary considerably both diurnally and seasonally. In order to characterise sediment variability, sub-daily close-interval sampling measurements of suspended sediment concentrations are usually undertaken. In close-interval …
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Evaluation of a Permittivity Sensor for Continuous Monitoring of Suspended Sediment Concentration
… the US Environmental Protection Agency (USEPA) sediment is a leading cause of water quality impairment (US EPA, 2002). The annual costs of sediment pollution in North America alone are estimated to range between $20 and $50 billion (Pimentel et al., 1995; Osterkamp et al, 1998, 2004). Due to the …
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Experiments on the Transformation of Mud Flocs in Turbulent Suspensions
… one of the most crucial parameters influencing sediment transport modeling. A series of laboratory experiments were conducted to examine the impact of suspended sediment concentration, mixes of clay and silt, and resuspension process to equilibrium floc size and floc settling velocity. In order …
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Experimental study of reservoir turbidity currents venting
… of their performance is threatened by sediment deposition within the impoundment. To achieve long-term sustainable performance of reservoirs, and to reach effective sediment management techniques, it is necessary to understand the characteristics of sediment and how it behaves before, …
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Predicting suspended sediment in Illinois rivers using dimensionless rating curves
Suspended sediment concentrations in Illinois are a serious concern to the environment and navigability of Illinois rivers, the Mississippi River and the Gulf of Mexico. Therefore, understanding the amount of sediment in a river is important. Measuring the sediment, though, can be a lengthy, …
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Prediction of sedimentation and bank erosion due to the construction of Kahang Dam
… of tools for better understanding of the sediment dynamics and riverbank erosion downstream the dam will be of great benefit to researchers and policymakers. The present research employs the use of field techniques and estimation models to improve the (i) prediction of suspended sediment …
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Impact of rainfall events on suspended sediment load and water quality and links to sediment management in Dzindi River Catchment
… at determining the impact of rainfall events on suspended sediment concentration (SSC) and water quality and links to sediment management in Dzindi River Catchment, Limpopo Province. Rainfall events of different magnitudes and duration erode different sediment volumes resulting in significant …
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In situ characterization of sediment oxygen demand across the spectrum of non-resuspension to full resuspension with varying bed shear stress
Sediment oxygen demand (SOD) can be a significant oxygen sink in various types of water bodies, particularly slow-moving waters with substantial organic sediment accumulation. In most settings where SOD is a concern, the prevailing hydraulic conditions are such that the impact of sediment …
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Mass balance modeling of polychlorinated biphenyls in the Lower Duwamish Waterway
… helps to determine the different sources and concentrations of PCBs within the Lower Duwamish Waterway to aid future remedial activities. There are four unknown state variables: freshness, suspended sediment concentration, dissolved phase total PCB concentration, and sorbed phase total PCB …
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SEDIMENTARY CHARACTERISTICS AND ASSOCIATED CARBON AND NUTRIENTS OF OVERBANK SEDIMENTS DEPOSITED DURING THE 2018, 2019, AND 2020 FLOODS IN EMBANKED FLOODPLAINS ALONG THE LOWER MISSISSIPPI RIVER NEAR NATCHEZ, MISSISSIPPI
… major floods in 2018, 2019, and 2020. Sediment deposition in the embanked floodplains during floods represent important storage and sequestration opportunities for carbon and nutrients from ~40% of the continental USA. This research aims to compare depositional thicknesses, organic …
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Suspended Sediment Transport Dynamics and Sediment Yields in Relation to Watershed Characteristics, Upper Green River Basin, Kentucky
Sediment delivery is a major problem in the Green River, Kentucky, home of 71 of the state’s 103 known mussel species and 151 fish species. The river also provides water for many of its surrounding counties. This research focuses on how suspended sediment loads, grain size, and sediment …
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Two-phase Flow Modelling of Mud Flocs Sedimentation in Coastal Waters
Cohesive sediments can be found widely such as on continental shelves, at estuaries and in coastal waters. Various engineering problems such as siltation of navigation channels and polluting coastal environment can be caused by the cohesive sediments. To solve these problems, field/lab experiments …
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Turbulence and macro-turbulence in the bottom boundary layer downstream of large-scale bedforms; implications for sediment transport
… boundary layer (BBL) flow characteristics and on sediment transport are analysed in a natural shallow coastal site and in a laboratory flume. The main signature of flow/bedform interaction processes consists of large scale flow structures, generated downstream of the bedforms; these are …
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Spatial and temporal analysis of heavy metals in surface waters, bed sediments and suspended sediments of the River Stour, East Kent, U.K.
… of metal enrichment in surface waters and bed sediments coincides mainly with areas of urbanisation and high density traffic in addition to point source discharges including STW and industrial effluent outlets. Non-tidal surface water samples exhibiting Pb, Co, Cu, Fe and Zn concentrations …
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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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Studies of sediments in a tidal environment
Five sedimentary environments in Plymouth Sound, S.W. England, are defined by side-scan sonar surveys calibrated by direct sampling by SCUBA divers: (i) uniform mud depocentres, (ii) areas of continual sediment reworking, (iii) areas of relict sedimentation, (iv) areas of episodic deposition and, …
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The Development of an In-situ Mud Floc Microscope Imaging Device and In-situ Floc Observations from the Lowermost Mississippi River
Mud makes up a large fraction of sediment transported within rivers to the coasts. Predicting where mud will settle is complicated by the cohesive nature of silts and clays, which can combine to form larger aggregates known as flocs. The size and density, and consequently, the settling velocity, of …
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A continental shelf bottom boundary layer model : the effects of waves, currents, and a movable bed
… a combined wave and current flow over a moveable sediment bed. An eddy diffusivity closure scheme that includes the effect of suspended sediment, temperature, and salinity induced stratification on the vertical turbulent diffusion of mass and momentum couples the resulting unsteady conservation …
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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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Hydroclimatic influences on suspended sediment delivery in a small, High Arctic catchment
A study of suspended sediment transport dynamics was undertaken in the West River at Cape Bounty, Melville Island, Nunavut. Hydrometerological conditions and sediment transport were measured over three seasons in order to characterize suspended sediment transport and grain size characteristics in …
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