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《Journal of Glaciology and Geocryology》 2018-02
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Annual variation of the runoff and precipitation in the Hulu River basin,a tributary of the Weihe River,from 1956 to 2016

WANG Shuhong;ZHANG Yu;WANG Dachao;LU He;DU Lifang;College of Earth and Environmental Sciences,Lanzhou University;  
It is of great significance for the regional water resources planning and exploitation to study the variation characteristics of river runoff and basin precipitation. In this paper,study was carried out of the variation of the Hulu River main runoff and basin precipitation,such as annual variation,periodic property and mutation,using the method of standard departure accumulation curve method,wavelet analysis and Mann-Kendall so on,according annual runoff data and precipitation data of the two main hydrological control stations on the upper reaches and downstream of the Hulu River. The result showed that the variation of runoff in the upstream and downstream of the Hulu River manifests good uniformity,and the annual variations of the Hulu River upstream and downstream runoff are basically identical. Both runoff and precipitation are decreasing,however,the rate of runoff reduction is far greater than that of precipitation and the decrease rate of downstream runoff is more than that of upstream. From the perspective of varying periodic,the main runoff change cycles in the Hulu River upstream and downstream are consistent. But in the downstream runoff transformation is more frequent than that in the upstream. The relationship between the upstream and downstream runoffs is not so good. The main cycle and subcycle of runoff are less than the change period of precipitation. Besides,runoff and basin precipitation change cycles showlittle corresponding relationship,and the varying cycle of runoff is short than that of precipitation. Finally,the runoff of downstream of the Hulu River had a obviously mutation in 1988,but there was no obvious abrupt changes in upstream runoff and in precipitation of the whole basin.
【Fund】: 国家自然科学基金项目(41271092)资助
【CateGory Index】: P333;P426.6
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