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Runoff and Its Impacting Factors in the Water-exporting Rivers of the First Stage Project of the South-to-North Water Transfer Scheme via the Western Route:——A case study in Daqu

MEN Bao-Hui~(1,2),LIU Chang-Ming~2,XIA Jun~2,LIU Su-Xia~2 (1.Department of Hydroulic and Hydropower Engineering School of Energy and Power Engineering North China Electric Power University,Beijing 102206;2.Key Laboratory of Water Cycle and Related Land Surface Process,Institute of Geographical Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101)  
Based on the runoff in 1961-1996 at Zhuwo Hydro-station and the precipitation data at Donggu Hydro-station,the relationship between runoff amount and its impacting factors in the Water-exporting Rivers of the First Stage Project of the South-to-North Water Transfer Scheme via the Western Route is analyzed.The result shows that the annual mean air temperature was increasing,with a linear variation rate of 0.24℃/10a,and it has increased 0.864℃ since the 1960s;the annual evaporation was increasing,with a linear variation rate of +2.78mm/10a;the annual mean precipitation and precipitation in spring,winter and non-flood season have been increased since the 1960s,with a linear variation rate of annual precipitation of +5.2mm/10a;the annual runoff amount and runoff amount in spring,autumn,flood season and non-flood season were increasing,and the runoff amount in spring and non-flood season were more significant.The increasing temperature and evaporation were not the main factors to impact the runoff amount,while the annual precipitation was one of the main factors for impacting the runoff amount at the Water-exporting Rivers of the First Stage Project of the South-to-North Water Transfer Scheme via the Western Route.
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