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Detection of the variation points of Weihe River watershed runoff process based on rank sum

BAI Cun-you1,ZHANG Sheng-tang2(1 Yangling Vocational&Technical College,Yangling,Shaanxi 712100,China;2 College of Geosciences and Technology,Shandong University of Science&Technology,Qingdao,Shandong 266510,China)  
【Objective】 The variation points position and number of Weihe River runoff processes are detected by the rank sum test.【Method】 Due to complex hydrological process,three steps are adopted:principium test,detailed test and integration analysis,the second step being the core.Based on analyzing the detection of the variation points,this paper applies the rank sum test of sliding to test the runoff sequential of 6 hydrometric stations in the middle part of Weihe River and the main branches.Meanwhile,the genetic analysis is used.The data about runoff from 1956 to 2005,lasting for 50 years,is used for detection.The number and position of the salience variation points of the runoff process are analyzed by this method.【Result】 After the three steps test,there are two variation points(1971,1994) in Linjiacun,Weijiabao,Xianyang and Huaxian 4 hydrometric stations of the Weihe River main stream.The runoff process can be divided into three parts(1956-1970,1971-1993 and 1994-2005).And only one variation point(1994) is in Jingcun and Zhuangtou 2 hydrometric stations of the Weihe River tributary.The runoff process can be divided into two parts(1956-1993,1994-2005).【Conclusion】 For simpler,more feasible,better adaptability and trustiness in the variation points test,the rank sum test of sliding is promised to be popularized.The test result accords with the fact of 6 hydrometric stations in Weihe River watershed.This indicates that the rank sum test of sliding can supply consistency analysis and restoration of runoff processes.
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