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- W2055012013 abstract "Due to a lack of data on settling velocities (ws) and grain size distributions (GSDs) in floodplain environments, sedimentation models often use calibrated rather than measured parameters. Since the characteristics of suspended matter differ from those of deposited sediment, it is impossible to derive the ws and GSD from the latter. Therefore, one needs to measure in situ suspended sediment concentrations (SSCs), settling velocities, effective grain sizes and sedimentation fluxes. For this purpose we used the LISST-ST, a laser particle sizer combined with a settling tube. In 2002 (twice) and 2004, we located the LISST-ST with an optical backscatter sensor and sediment traps in two floodplains in The Netherlands: one along the unembanked IJssel River, another along the embanked Waal River. Measurements revealed that the SSC in the floodplains varied in relation to the SSC in the river channel. Smaller flocs dominated the SSC, while larger flocs dominated the potential sedimentation fluxes. The in situ GSD in the IJssel floodplain was significantly coarser than in the Waal floodplain, while the dispersed median grain sizes were equal for both floodplains. Therefore, the dispersed median grain size was two to five times smaller than the effective one. The in situ grain size exhibited a significant positive relationship with ws, although the ws for the largest flocs showed high variability. Consequently, the variability in sedimentation fluxes was also large. In the actual sedimentation fluxes, and hence in sedimentation models, in situ grain sizes up to about 20 µm can be neglected. In floodplain sedimentation models the relation between settling velocity and in situ grain size can be used instead of Stokes's law, which is only valid for dispersed grain sizes. These models should also use adequate data on flow conditions as input, since these strongly influence the suspended sediment characteristics. Copyright © 2005 John Wiley & Sons, Ltd." @default.
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- W2055012013 date "2005-01-01" @default.
- W2055012013 modified "2023-10-18" @default.
- W2055012013 title "In situ measurements of sediment settling characteristics in floodplains using a LISST-ST" @default.
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- W2055012013 doi "https://doi.org/10.1002/esp.1239" @default.
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