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| Effects of vegetative cover on runoff hydraulic characteristics and erosion |
| Li Peng1,2,Cai Wenbin1,Zheng Liangyong3,Ru Huanan4 |
1.Water Conservancy and Hydroelectric College,Xi'an University of Technology,710048,Xi'an;2.Forestry College,Northwest Sci-Tech University of
Agriculture Forestry,712100,Yangling,Shaanxi;3.Shan Dong Survey and Design Insititute of Water Conservancy,250013,Jinan;4.Agriculture and Corestry
Company,Yima coal Group,Yima,Henan,472300: China |
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Abstract Relationship between vegetation and runoff hydrodynamic characteristic was probed into based on field simulate experimentation under different vegetative cover on pasture slope.Results indicated that the difference in vegetation integrality had influence clearly on runoff velocity,and the order of runoff velocity on vegetative plots was following,bare plot(0.27m/s)>shaved plot(0.24m/s)>clipped plot(0.16m/s)>original plot(0.1m/s)>herbicide plot(0.08m/s).Changes of Reynolds number showed the similar trends.Analysis of Darcy-weisbach friction indicated that runoff friction increased with the integrality of vegetative cover,while runoff depth increased with the integrality of vegetative cover.Sediment decreased with the integrality of vegetative cover,and consequently sediment transportation rate decreased from 400?g/min to 3?g/min.
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Received: 28 April 2005
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