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| DOI： |
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| Analysis of Recent Variation Trend and Cause of Runoff and Sediment Load Variations in the Yangtze River Basin |
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CHAI Yuanfang, LI Yitian, LI Sixuan, ZHU Boyuan, WANG Jingyi
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State Key Laboratory of Water Resources and Hydropower Engineering Sciences, Wuhan University, Wuhan 430072, China
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| Abstract: |
| The double mass curve method was adopted respectively to analysis the seven hydrological stations，s relationship between water and sediment in the Yangtze river basin from 2000 to 2013 in this paper. Based on the non-parameter statistical methods of Mann-Kendal test and Yamamoto mutation test, the change trend and mutation years of water and sediment were analyzed. The results showed that the double mass curves of Pingshan, Zhutuo and Cuntan station were more straight. However, all the double mass curve of Yichang, Shashi, Hankou and Datong station had an obvious turning point in 2005. The slope was reduced after the turning point which showed that the sediment load was decreased significantly; The runoff trend of the Yangtze river was relatively stable and the catastrophe phenomenon was less, and only pingshan station had an obvious turning points in 2001—2002 and 2005—2006. However, the changed tendency of annual sediment discharge was more obvious and the catastrophe phenomenon often occured. Besides, no false points were found in Yichang, Shashi, Hankou and Datong station; the the three gorges reservoir and the closure work of Xiluodu and Xiangjiaba hydropower station，s closure work, coupled with the continuous work of soil and water conservation are the main reasons of sediment-transportation decreasing in the mainstream of the Yangtze since 2000, and the declining rainfall is an important factor that causes the decrease of runoff . |
| Key words: tendency analysis; Mann-Kendall test; Yamamoto test; Yangtze river basin; changes of runoff and sediment |
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