The effect of land use on runoff in Shenzhen City of China
The land cover change induced by the land use of hum an beings is the main cause and important part ofeco-environment change. The effect of land use on natural disasters is one of the main processes Flood disaster is one of the disasters, the number ofwhich is most and the loss ofwhich is the most serious. The effect of land use on rainfall- runoff process is studied to understand the relationship between land use and flood disaster. In the flood generation process, the effect of land use pattern and intensity on runoff generation and concentration is the foundation to study the change of urban flood caused by the human activities. Revealing the mechanism of land use on the flood generation is important to reduce urban flood disaster. The first important issue, which should be answered, is how the land use pattern influences the change of runoff coefficient and the mechanism of runoff generation and concentration. Shenzhen City has grown to a modernized city from a fishery village after it was assigned as the first Special Economis Zone in China from 1980. With more than twenty years econom is reform and opening, the great changes of land use patterns in Shenzhen City are inevitable. So, Shenzhen City is taken up as case study area to study runoff change due to land use change. Based on the data of land use, hydrology and meteorology, SCS model, developed by Soil Conservation Service(SCS),U.S.A.,is applied to study the rainfall-runoff relationship of some rivers in Shenzhen City. The follow ing is the main conclusions of the paper.