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| Scouring erosion experiment on bare slight slope in Ili River Basin |
| Ma Ping1,Song Fenghui2,Shi Yanjiang2,Wang Jian1,Zhu Shoujun1 |
| 1.Northwest Sci-Tech University of Agriculture and Forestry,712100,Yangling,Shaanxi;2.Xinjiang Forest-Science Academy,830000,Urumqi: China |
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Abstract Based on the scouring erosion experiment on bare slight slope in Ili River Basin,water infiltration and the characteristics of runoff and sediment were studied,and the hydraulic parameters characteristics of surface runoff were analyzed.The results showed: 1) Soil infiltration rate took on the trend of increasing as the scouring water discharge increased;however,it had a trend of decreasing with the scouring water amount increasing.A higher variation of soil water had on the lower slope compared to the upper slope.2) The process of sediment discharge went up as the scouring water discharge increased,and the sediment concentration had a trend from high to low.The relation between the sediment concentration and the scouring water discharge presented a power function.With the scouring time continuing the sediment concentration and the sediment discharge both went down.3) The average flow velocity,the Reynolds number and the Darcy-Weisbach resistance coefficient increased as the scouring water discharge increased,the Froude number decreased as the scouring water discharge increased.The relation between the average flow velocity and the scouring water discharge,the Froude number and the Reynolds number both presented power functions.The water flow presented a laminar,supercritical flow state.
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Received: 14 June 2009
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