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A1. Modelling hysteresis in sediment transport and continuous distributions of eroded sediment

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Abstract

Sediment transport hysteresis occurs due to the different sediment fluxes for the same discharge on the rising and falling limb of the overland flow hydrograph. Experimental field data has shown that the common shapes of the hysteresis loops encompass (i) clockwise, (ii) anti-clockwise and (iii) figure 8 with both flow orientations. It has been suggested that the shape of these loops can be used to identify the different processes of runoff and sediment transport and the sediment source area. We present simulations carried out using the Hairsine-Rose (HR) erosion model which reproduces all of the above hysteresis loops for flow conditions that are straightforward to establish within a laboratory flume. As both agricultural chemical and biological pathogens bind preferentially to the clay and silt sized particles, estimating contaminant fluxes to surface water bodies requires knowledge of the size distribution of transported sediment. We also present some recent work on extending the HR model from discrete sediment size classes to a continuous distribution of sizes along with some corresponding solutions.

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Once downloaded, these high definition QuickTime videos may be played using a computer video player with H.264 codec, 1280x720 pixels, millions of colors, AAC audio at 44100Hz and 29.97 frames per second. The data rate is 5Mbps. File sizes are on the order of 600-900 MB. (Other formats may be added later.) Free QuickTime players for Macintosh and Window computers may be located using a Google search on QuickTime. The DVD was produced by J. Robert Cooke.

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2012-05

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Internet-First University Press

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soil erosion; sediment size class distributions; sediment discharge hysteresis; clockwise; anti-clockwise; figure eight loops; distributed sediment sources

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Government Document

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video/moving image

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