Sediment Wash-Off from an Impervious Urban Land Surface
Publication: Journal of Hydrologic Engineering
Volume 18, Issue 5
Abstract
Sediment wash-off from impervious land is believed to be related to various factors including sediment buildup, rainfall intensity, rainfall energy, runoff rate, sediment sizes, and land surface characteristics. Most previous studies have used controlled rainfall in small areas to investigate mechanisms of sediment wash-off. This paper presents sediment wash-off results from an impervious urban surface under actual accumulation and rainfall events. Two temporal scales were considered when the sediment wash-off processes were investigated. On the event scale, sediment wash-off is strongly correlated with runoff volume. On the instantaneous scale, sediment wash-off from eight rainfall events was investigated using first-order and zero-order wash-off equations. Source-limited and transport-limited wash-off processes were discussed. The wash-off process on October 10, 2002, was linearly dependent on runoff and can be described using a first-order exponential equation. The wash-off processes on May 15, 2003, and June 7, 2003, can be described using a zero-order equation. For the remaining storms, both first-order and zero-order wash-off equations can represent the wash-off processes.
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Acknowledgments
The authors thank Mr. Jeff Strong from Tetra Tech for editing the paper and the anonymous reviewers for their comments.
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Information
Published In
Journal of Hydrologic Engineering
Volume 18 • Issue 5 • May 2013
Pages: 488 - 498
Copyright
© 2013 American Society of Civil Engineers.
History
Received: May 18, 2011
Accepted: May 22, 2012
Published online: May 24, 2012
Published in print: May 1, 2013
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