Variation of Rainfall over the Southern Part of Qinghai-Xizang Plateau and Its Influences on Water Resource in the Upper Reaches of the Yellow River
青南高原大气降水变化规律及其对黄河上游地区水资源的影响

The data of rainfall and flow at the upper reaches of the Yellow River from 1959 to 1997 and the EOF, REOF methods were used to analyze relation between rainfall and flow at the upper reaches of the Yellow River and to estimate water resource in this area. The analyses show that large or small flow of entering the Longyangxia Reservoir is major related to the annual precipitation at the upper reaches of the Yellow River. The flow in Spring is mainly related to the flow in the last year's autumn and the precipitation in Spring. But the flows in Summer and Autumn are principally related to the corresponding precipitation.