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| Characteristics and Regional Differences of Runoff Cost of Sediment Control of Conservation Measures and Their Simulation in Weihe River Basin |
| Wang Fei,Li Rui,Mu Xingmin,Yang Xinmin |
| Institute of Soil and Water Conservation,Chinese Academy of Science and Ministry of Water Resources,Northwest Sci tech University of Agriculture and Forestry: 712100, Yangling, Shaanxi, China |
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Abstract The runoff cost of sediment control of soil and water conservation measures and water resources engineering projects play an important role in integrated evaluation of influence of measures on runoff and sediment and resolving the sediment and water problems in Weihe River Basin. The soil and water conservation measures include terrace, reforestation, grass planting and dam land, and water resources engineering measures include irrigation with sediment flow and reservoir. By comparing the Ratio of detained Runoff and Sediment (Rrs) in different measures, the results showed that the runoff cost of sediment control of irrigation measures is the highest, that of terrace, reforestation, grass planting is less, and that of dam land and reservoir is relatively low. The regional differences of measures are clear, and the correlation between sediment flow modulus in flood period and the runoff costs of sediment control of all kinds of measures except dam land are evidently negative. The simulation showed that when the same amount of sediment are detained, the more runoff could occur in case of different measures change and regional distribution.
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Received: 14 April 2004
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