Effect of Microtopography, Slope Length and Gradient, and Vegetative Cover on Overland Flow Through Simulation

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	Effect of Microtopography, Slope Length and Gradient, and Vegetative Cover on Overland Flow Through Simulation
	Liu QQ(刘青泉); Singh VP
刊名	Journal of Hydrologic Engineering
	2004
通讯作者邮箱	qqliu@imech.ac.cn
卷号	9 期号:5 页码:375-382
ISSN号	1084-0699
通讯作者	Liu, QQ (reprint author), Chinese Acad Sci, Inst Mech, Beijing 100080, Peoples R China.
中文摘要	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.
学科主题	力学
类目[WOS]	Engineering, Civil ; Environmental Sciences ; Water Resources
研究领域[WOS]	Engineering ; Environmental Sciences & Ecology ; Water Resources
关键词[WOS]	INFILTRATING SURFACES ; VENANT EQUATIONS ; RUNOFF ; HYDROGRAPH ; EROSION
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000223363900005
公开日期	2007-06-15 ; 2007-12-05 ; 2009-06-23
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/16223]
专题	力学研究所_力学所知识产出(1956-2008)
推荐引用方式 GB/T 7714	Liu QQ,Singh VP. Effect of Microtopography, Slope Length and Gradient, and Vegetative Cover on Overland Flow Through Simulation[J]. Journal of Hydrologic Engineering,2004,9(5):375-382.
APA	刘青泉,&Singh VP.(2004).Effect of Microtopography, Slope Length and Gradient, and Vegetative Cover on Overland Flow Through Simulation.Journal of Hydrologic Engineering,9(5),375-382.
MLA	刘青泉,et al."Effect of Microtopography, Slope Length and Gradient, and Vegetative Cover on Overland Flow Through Simulation".Journal of Hydrologic Engineering 9.5(2004):375-382.