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Title: Effect of Microtopography, Slope Length and Gradient, and Vegetative Cover on Overland Flow Through Simulation
Author: Liu QQ(刘青泉); Singh VP
Source: Journal of Hydrologic Engineering
Issued Date: 2004
Volume: 9, Issue:5, Pages:375-382
Abstract: Overland flow on a hillslope is significantly influenced by its microtopography, slope length and gradient, and vegetative cover. A 1D kinematic wave model in conjunction with a revised form of the Green-Ampt infiltration equation was employed to evaluate the effect of these surface conditions. The effect of these conditions was treated through the resistance parameter in the kinematic wave model. The resistance in this paper was considered to be made up of grain resistance, form resistance, and wave resistance. It was found that irregular slopes with microtopography eroded more easily than did regular slopes. The effect of the slope gradient on flow velocity and flow shear stress could be negative or positive. With increasing slope gradient, the flow velocity and shear stress first increased to a peak value, then decreased again, suggesting that there exists a critical slope gradient for flow velocity and shear stress. The vegetative cover was found to protect soil from erosion primarily by enhancing erosion-resisting capacity rather than by decreasing the eroding capability of overland flow.
Language: 英语
Indexed Type: SCI ; EI
Corresponding Author: Liu, QQ (reprint author), Chinese Acad Sci, Inst Mech, Beijing 100080, Peoples R China.
Correspondent Email: qqliu@imech.ac.cn
DOI: 10.1061/(ASCE)1084-0699(2004)9:5(375)
DOC Type: Article
WOS Subject: Engineering, Civil ; Environmental Sciences ; Water Resources
WOS Subject Extended: Engineering ; Environmental Sciences & Ecology ; Water Resources
WOS Keyword Plus: INFILTRATING SURFACES ; VENANT EQUATIONS ; RUNOFF ; HYDROGRAPH ; EROSION
WOS ID: WOS:000223363900005
ISSN: 1084-0699
Subject: 力学
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/16223
Appears in Collections:力学所知识产出(1956-2008)_期刊论文

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