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Slope runoff study in situ using rainfall simulator in mountainous area of north china

Journal of Geographical Sciences 2009年第4期19卷 461-470页

作者：于静洁杨聪刘昌明宋献方胡珊珊李发东唐常源 Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchCAS Bureau of Comprehensive Development Ministry of Water Resources Graduate University of Chinese Academy of Sciences Chiba University

Simulated rainfall is a valid tool to examine the runoff generation on the slope.13 simulated rainfall experiments with different rainfall intensities and durations are completed in a 5 m ×10 m experimental plot in mountainous area of north ***,rainfall,surface runoff,soil-layer flow,mantel-layer flow and soil moisture are monitored *** the results,it is found that the hydrographs in all layers have the characteristics of rapid rise and *** recessions of surface flow and soil-layer flow are much faster than that of mantel-layer *** flow,the main contributor,makes up more than 60% of the total runoff in the study *** even exceeds 90% in the cases of high intensity rainfall *** coefficient(ratio of total runoff to rainfall amount) is mainly influenced by rainfall amount,rainfall intensity and antecedent soil moisture,and the relationship can be well expressed by a multiple linear regression function α = 0.002P + 0.182i + *** relation between the rainfall intensity and the lag time of three flows(surface runoff,soil-layer flow and mantel-layer flow) is shown to be ***,the result also shows that the recession constant is 0.75 for surface runoff,is 0.94 for soil-layer and mantel-layer flow in this *** this study area,the dominant infiltration excess runoff is simulated by Horton *** 0.10 mm/min percolation is observed under the condition of different rainfall intensities,therefore the value is regarded as the steady infiltration rate of the study area.

关键词： simulated rainfall slope plot runoff generation process mountainous area of north china

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