doi:

DOI: 10.3724/SP.J.1201.2011.01053

South-to-North Water Diversion and Water Science & Technology (南水北调与水利科技) 2011/9:1 PP.53-59

Spatial and temporal Variations of Precipitation and Runoff in the Source Region of the Yangtze River


Abstract:
The source region of the Yangtze River lies to northeast of the Northwestern Plateau in Sichuan,which is one of the most important areas of the Three-River headwaters region in China.In the recent 40 years,the frozen earth-ecological environment system in this area has changed greatly with climate warming.Particularly,the annual runoff decreased continuously,and the variation of the runoff had affected the function of conservation on water supply in the source region of the Yangtze River at the same time.Therefore,it is urgent to study the spatial-temporal variation of the runoff in the source region of the Yangtze River.Based on the data from the hydrologic and meteorological stationsincluding Tuotuo River,Wudaoliang,Zhiduo,Qumalai and Yushu,a multiple time scales analysis has done to show the annual,inter-annual and decadal variations of the precipitation and runoff.Furthermore,the calculating results showed that annual runoff of the source region of the Yangtze River changed with precipitation,the runoff seasonal distribution focused from May to October and had a reducing trend,and decadal changes of runoff did not show obvious trend.These results have a very important scientific value and a practical meaning to the further study on the water resources security and the ecological environment in this area,the sustainable utilization of water resources in the middle and lower reaches of the river,and the security of the regional ecosystem in the Three Gorges reservoir area especially.

Key words:the source region of the Yangtze River,precipitation,runoff,spatial and temporal variations

ReleaseDate:2014-07-21 15:58:58



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