Suspended Sediment

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Graham J.l. Leeks - One of the best experts on this subject based on the ideXlab platform.

  • Suspended Sediment fluxes in the Humber catchment, UK
    Hydrological Processes, 1999
    Co-Authors: Paul D. Wass, Graham J.l. Leeks
    Abstract:

    An extensive Sediment monitoring network was established within the LOIS programme, involving 10 of the main tributaries of the River Humber (UK). Its primary purpose was to measure the flux of Suspended Sediment to the estuary. A turbidity monitoring system was developed to provide a continuous record of Suspended Sediment concentration in the rivers, from which the fluxes were calculated. Linear relationships were established between Suspended Sediment concentration and turbidity (with slopes varying from 0.89 to 1.69) to enable the conversion of nephelometric turbidity [NTU] to Suspended Sediment concentration [mg l -1 ]. Potential uncertainties were identified and quantified. The Suspended Sediment flux to the Humber (November 1994-October 1997) was calculated to be 699 861 t, equivalent to a yield of 15 t km -2 yr -1 . Large temporal and spatial variations in the flux were measured during the monitoring period, in response to factors such as climate, land use, catchment scale, deposition and reservoir trapment. The particle size composition of the Suspended Sediment was measured and found to vary little, except at very high discharges, when it coarsened. The organic content of the Sediment was found to be directly related to the discharge of sewage effluent to the rivers.

Paul D. Wass - One of the best experts on this subject based on the ideXlab platform.

  • Suspended Sediment fluxes in the Humber catchment, UK
    Hydrological Processes, 1999
    Co-Authors: Paul D. Wass, Graham J.l. Leeks
    Abstract:

    An extensive Sediment monitoring network was established within the LOIS programme, involving 10 of the main tributaries of the River Humber (UK). Its primary purpose was to measure the flux of Suspended Sediment to the estuary. A turbidity monitoring system was developed to provide a continuous record of Suspended Sediment concentration in the rivers, from which the fluxes were calculated. Linear relationships were established between Suspended Sediment concentration and turbidity (with slopes varying from 0.89 to 1.69) to enable the conversion of nephelometric turbidity [NTU] to Suspended Sediment concentration [mg l -1 ]. Potential uncertainties were identified and quantified. The Suspended Sediment flux to the Humber (November 1994-October 1997) was calculated to be 699 861 t, equivalent to a yield of 15 t km -2 yr -1 . Large temporal and spatial variations in the flux were measured during the monitoring period, in response to factors such as climate, land use, catchment scale, deposition and reservoir trapment. The particle size composition of the Suspended Sediment was measured and found to vary little, except at very high discharges, when it coarsened. The organic content of the Sediment was found to be directly related to the discharge of sewage effluent to the rivers.

Fengyan Shi - One of the best experts on this subject based on the ideXlab platform.

  • A wave-resolving model for nearshore Suspended Sediment transport
    Ocean Modelling, 2014
    Co-Authors: Yi-ju Chou, Fengyan Shi
    Abstract:

    Abstract This paper presents a wave-resolving Sediment transport model, which is capable of simulating Sediment suspension in the field-scale surf zone. The surf zone hydrodynamics is modeled by the non-hydrostatic model NHWAVE (Ma et al., 2012). The turbulent flow and Suspended Sediment are simulated in a coupled manner. Three effects of Suspended Sediment on turbulent flow field are considered: (1) baroclinic forcing effect; (2) turbulence damping effect and (3) bottom boundary layer effect. Through the validation with the laboratory measurements of Suspended Sediment under nonbreaking skewed waves and surfzone breaking waves, we demonstrate that the model can reasonably predict wave-averaged Sediment profiles. The model is then utilized to simulate a rip current field experiment (RCEX) and nearshore Suspended Sediment transport. The offshore Sediment transport by rip currents is captured by the model. The effects of Suspended Sediment on self-suspension are also investigated. The turbulence damping and bottom boundary layer effects are significant on Sediment suspension. The Suspended Sediment creates a stably stratified water column, damping fluid turbulence and reducing turbulent diffusivity. The suspension of Sediment also produces a stably stratified bottom boundary layer. Thus, the drag coefficient and bottom shear stress are reduced, causing less Sediment pickup from the bottom. The cross-shore Suspended Sediment flux is analyzed as well. The mean Eulerian Suspended Sediment flux is shoreward outside the surf zone, while it is seaward in the surf zone.

Gregory E. Schwarz - One of the best experts on this subject based on the ideXlab platform.

  • Comparability of Suspended-Sediment Concentration and Total Suspended Solids Data
    Water-Resources Investigations Report, 2001
    Co-Authors: John R. Gray, G. Douglas Glysson, Lisa M. Turcios, Gregory E. Schwarz
    Abstract:

    Introduction Field Techniques and Laboratory Methods Field Techniques Laboratory Methods Suspended-Sediment Concentration Analytical Method Total Suspended Solids Analytical Method Differences Between the Suspended-Sediment Concentration and Total Suspended Solids Analytical Methods Description of Data Used in the Evaluation Arizona Hawaii Illinois Kentucky Maryland Virginia Washington Wisconsin Quality-Control D a t a Comparability of Suspended-Sediment Concentration and Total Suspended Solids Data. Natural-Water Data Quality-Control D a t a Conclusions References Cited

  • comparability of Suspended Sediment concentration and total Suspended solids data
    Water-Resources Investigations Report, 2000
    Co-Authors: John R. Gray, Lisa M. Turcios, Douglas G Glysson, Gregory E. Schwarz
    Abstract:

    Introduction Field Techniques and Laboratory Methods Field Techniques Laboratory Methods Suspended-Sediment Concentration Analytical Method Total Suspended Solids Analytical Method Differences Between the Suspended-Sediment Concentration and Total Suspended Solids Analytical Methods Description of Data Used in the Evaluation Arizona Hawaii Illinois Kentucky Maryland Virginia Washington Wisconsin Quality-Control D a t a Comparability of Suspended-Sediment Concentration and Total Suspended Solids Data. Natural-Water Data Quality-Control D a t a Conclusions References Cited

Akira Mano - One of the best experts on this subject based on the ideXlab platform.

  • A TURBULENT AND Suspended Sediment TRANSPORT MODEL FOR PLUNGING BREAKERS
    Coastal Engineering Journal, 2008
    Co-Authors: Budianto Ontowirjo, Akira Mano
    Abstract:

    Extensive studies have suggested a high concentration of Suspended Sediment near the free surface induced by strong plunging breakers. However, prediction by models have not been successful because of the localized interactions among the plunging jet, turbulent production, and Sediment movement. This study proposes a new calculation model for turbulent flow and Suspended Sediment transport in the surf zone. A numerical model was developed to simulate the flow and Sediment motion in connection with plunging breakers in the surf zone. The Reynolds-Averaged Navier–Stokes (RANS) equations in two spatial dimensions were employed to simulate the flow field together with a k-e model for the turbulence and the Volume of Fluid (VOF) method for multiple free-surface tracking. An advection-diffusion equation was used for the Suspended Sediment concentration with a bottom boundary condition following the reference concentration formulation. Performance of the Suspended Sediment transport model under plunging breaking waves were examined through the comparison with experimental data. Good agreement between the model and experimental data was obtained for the surface elevation and velocity, turbulent kinetic energy, eddy viscosity and Suspended Sediment concentration. The overturning waves, plunging jet and transport of high concentration of Suspended Sediment near the free surface are reproduced by the present model with selected fine mesh resolution. The study shows the applicability of the present model in the turbulent and Suspended Sediment dominated region induced by strong plunging breakers.