Trends Characteristics of Annual Runoff Changes in Yellow River Basin

摘要

River runoff is the primary water resources in the Yellow River. 15 subregions are regionalized in the Yellow River and their annual runoff series are calculated during 1951-1998. Then the variations and trends of them are analyzed and the results show that runoff is quite different in spatial distribution, and there is a downward trend of annual runoff in the Yellow River Basin. We apply Mann-Kendall Test method to detect the abrupt changes of annual runoff series of subregions in the Yellow River Basin and the abrupt changes mainly appeared in 1952-1995, 1979-1983, 1991-1993 and 1994-1995. At last, some measurements for the water scarcity in the Yellow River basin are provided.