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Hydrologic Discovery Through Physical Analysis Honoring the Scientific Legacies of Wilfried H. Brutsaert and Jean-Yves Parlange >
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Please use this identifier to cite or link to this item: http://hdl.handle.net/1813/29548
Title: A2. Influence of Antecedent Moisture Conditions on Inter-rill Soil Erosion
Authors: van Meerveld, Ilja (H.J.)
Keywords: soil erosion
particle size
antecedent soil moisture conditions
EPFL erosion flume
Hairsine-Rose model
Issue Date: May-2012
Publisher: Internet-First University Press
Abstract: Few studies have looked at the effects of antecedent soil moisture conditions on inter-rill soil erosion and in many models soil erodability parameters are considered constant, even though it is well known that the soil’s inherent ability to resist erosion varies temporally due to differences in temperature, soil frost, time since ploughing, consolidation, microbial activity, soil organic matter content, soil moisture, etc. Therefore, 11 high rainfall intensity (>45 mm/hr) experiments were done on the 6-m × 2-m EPFL erosion flume to determine the effects of antecedent moisture conditions on inter-rill soil erosion. Pore pressure at 0.05 m below the soil surface at the start of the experiment had a large effect on peak sediment concentrations; wetter antecedent moisture conditions led to higher peak sediment concentrations, with the largest changes occurring near saturation. Antecedent moisture conditions also influenced the composition of the eroded sediment; wetter conditions led to a disproportionately large flux of clay- and silt- sized particles. The finding that the composition of the eroded sediment not only changes during an event but is also dependent on the antecedent moisture conditions has important implications for modelling the transport of chemical fluxes associated with the sediment flux, such as phosphorous fluxes. Antecedent moisture conditions did not influence the steady-state sediment concentrations. One of the optimized non-dimensional parameters in the analytical solutions of the Hairsine-Rose erosion model (α, the ratio of the re-detachability of the soil and runoff depth to the runoff ratio and the mass per unit area of sediment required for complete shielding) was linearly related to pore pressure at the start of the experiment. Using the linear relation between this non-dimensional parameter and pore pressure, the sediment concentrations and the composition of the eroded sediment could be simulated for a range of antecedent soil moisture conditions and events. This work builds on Dr. Parlange’s contributions to erosion research and finding analytical solutions to describe erosion processes, and is another step towards operational soil erosion models that can be used under a wide range of conditions.
Description: 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.
URI: http://hdl.handle.net/1813/29548
Appears in Collections:Hydrologic Discovery - Oral Presentations (Videos)

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File Description SizeFormat
streaming_29548.htmlStreaming Video Version8.22 kBHTMLView/Open
A2_IljaMeerveld_SLIDES.pdfPDF of slides used in the lecture3.27 MBAdobe PDFView/Open
A2_vanMeerveld_Erosion_SD_for_Apple_Devices.m4vDownload small version of Video171.04 MBM4v VideoView/Open
A2_vanMeerveld_Erosion-HD_for_Apple_Devices_5Mbps.m4vDownload HD Video for Apple Devices543.57 MBM4v VideoView/Open

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