紫色土丘陵区小流域地面侵蚀量预报

Prediction of Surface Erosion of Small Watersheds in Hilly Area of Purple Soils in Upper Reaches of Yangtze River

针对长江上游紫色土丘陵区小流域面积侵蚀及泥沙输移特征以及现有资料的可利用性，用演绎法建立了小流域地面侵蚀的预报模型及相应的输沙预报模型。模型参数求取简便，经研究区的典型小流域实测资料检验，预报精度较高，可用于研究区资料短缺小流域的地面侵蚀量和输沙量的估算。

According to the character of surface erosion and sediment delivery of small watershed andthe information availability in the hilly area of purple soils,the model predicting surface erosion andsediment yield of small watershed is established using the deductive method. The parameters of themedels can be obtained with ease. The example of its use for the typical small watershed in the research area shows that the prediction accuracy is acceptable and it can be successfully used to estimatesurface ersion or sediment yield of small watershed lacking of research data.