Temporal-Spatial Evolution of Water Resources in the Upstream of the Hanjiang River Basin and the Cause Analysis

Based on the long serial data from 1930 to 2008,this paper analyzed the temporal-spatial evolutionary law of water resources in the upstream of the Hanjiang River Basin,the high and low change law of the natural inflow of the Danjiangkou reservoir,and the causes of this change in view of precipitation and land-use changes.The change of water consumption of the upstream of the Hanjiang River Basin was also analyzed by comparison of the natural and observed inflow of the Danjiangkou reservoir.By the human activities and climate condition,the data were classified into three periods:before 1990,from 1990 to 1999 and after 2000 to compare and analyze the intra-annual distribution of the runoff and the causes.Finally,this paper comes out with the spatial change of water resources in the upstream of the Han River Basin through the research on the spatial distribution of the precipitation.