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Fractal Character and Statistical Model of Sediment Delivery of Small Watersheds in Hilly Area of Purple Soils

Li Qingyun,Sun Houcai,Jiang Shunqing(Yangtze River Scientific Research Institute,Wuhan 430010)  
In this paper,the character of sediment delivery process of small watershed in the hilly areaof purplesoils is analysed comprehensively。On the basis of the surface erosion modul us of elementalsmall watershed and the sediment accumulation data of ponds and reservoirs in research area,the sediment delivery ratios(SDR)of various small watersheds are calculated.The relationships of SDR andcatchment areas are discussed according to the self-similar principle of fractaI theroy,and statisticalmedel of SDR is thus obtained which can be used to estimate SDR and sediment yield of small water-sheds lacking of research data。
【Fund】: 长江水土保持局资助
【CateGory Index】: TV142
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