Based on analysis of the studies on runoff and sediment yield and hydrological effect in forest watersheds, major advances and problems are assessed and main trends of research in this field pointed out.

Based on the information of 33 times rainfall,runoff and sediment yield at No 3runoff plot in Zizhou Tuanshangou watershed,the variation of rainfall and runoff-sediment yieldon slope surface under diffrent rain pattern are analyzed by using statistic method.

Modeling refinery operation scheduling with inventory management;