紫色土丘陵区小流域泥沙输移的分形特征及输移比模型

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

综合分析了紫色土区小流域泥沙输移的特征。根据研究区库塘淤积资料及单元小流域地面侵蚀模数，计算了不同集雨面积小流域的泥沙输移比。应用分形理论的自相似原理，探讨了泥沙输移比与小流域集雨面积的关系，并得出泥沙输移比（ＳＤＲ）的统计模型，可用于估算紫色土丘陵区资料短缺小流域的输移比和产沙量。

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。