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Event-based Runoff and Sedimentation Processes from Two Watersheds of Different Land Uses on the Loess Plateau

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1009279.(doi:10.13031/2013.29843)
Authors:   Cuiping Yuan, Tingwu Lei, Xiusheng Yang
Keywords:   parallel small watershed, relationship between runoff and sediment, soil and water conservation management , runoff, sediment content, sediment transport rate

Understanding of temporal runoff processes under different land use is of great importance for soil and water conservation practice on the Loess Plateau at watershed scales. There are two parallel Loess Plateau watersheds with the same terrain, rainfall condition, soil category and proportion, one under different erosion control measures (Qiaozi-East Watershed) and the other as control (Qiaozi-West Watershed). Terrain difference was analyzed by using GIS and the runoff process data were optimized with interpolation method by using Matlab. The result indicated that the soil and water conservation management reduced soil and water loss, the sediment reduction was better than runoff reduction. The relationships between runoff depth and erosion modulus were fitted with proportional equations at Qiaozi-East and Qiaozi-West watersheds. Soil and water conservation management changed the coefficients of the proportional equations but no format. Soil and water conservation management affected the dynamic processes of runoff, sediment content and sediment transport rate. The time of runoff initiation and peaking flow at Qiaozi-East watershed were later than that at Qiaozi-East watershed. The ratios of peak flow, runoff duration at Qiaozi-East watershed to that at Qiaozi-West watershed decreased gradually. To the end of the management, the sediment contents in runoff processes at Qiaozi-East watershed were low than that at Qiaozi-West watershed, and the differences in sediment content increased. The sediment transport rates of Qiaozi-West watershed were higher significantly than that of Qiaozi-East watershed. Soil and water conservation management of Qiaozi-East watershed decreased the sediment transport rate of runoff remarkably.

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