An investigation of flow-driven soil erosion processes at low streampowers

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Title An investigation of flow-driven soil erosion processes at low streampowers
Author Asadi, Hossein; Ghadiri, Hossein; Rose, Calvin Wyatt; Yu, Bofu; Hussein, Janet
Journal Name Journal of Hydrology
Year Published 2007
Place of publication Netherlands
Publisher Elsevier BV
Abstract Summary There is general agreement among researchers that at least for some time during erosion events sediment leaving an area is finer than that of the soil under surface erosion. But in some cases, it has been observed that coarser particles are transported at greater rates than fines. This paper reports on the results of an investigation into the processes that control the size distribution of the sediment during runoff erosion events at low flow rates and streampowers. Experiments were carried out on three contrasting soil types in the 1 · 6 m flume of Griffith University's large rainfall-runoff simulation facility at a slope of 2%, with overland flow confined to uniform rectangular rills pre-formed in the soil bed. The time variation in size distribution of the exiting sediment was measured for all experiments. The results supported a selective bimodal particle size class pattern for transported sediment with peaks for the finest size class of <0.001 mm and also for the larger class of 1–2 mm. Particles between 0.1 and 0.5 mm appeared to resist transportation. It seems that this selectivity in transport may indicate different transport mechanisms, such as suspension, saltation and rolling, can dominate in different sediment size classes, perhaps reflecting differences in resistance to transportation (or transportability) at the low streampowers investigated.
Peer Reviewed Yes
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Copyright Statement Copyright 2007 Elsevier. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Volume 342
Page from 134
Page to 142
ISSN 0022-1694
Date Accessioned 2007-09-12
Language en_AU
Research Centre Environmental Futures Research Institute
Faculty Faculty of Science, Environment, Engineering and Technology
Subject PRE2009-Applied Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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