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《Advances In Water Science》 2002-05
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Study on sediment transport in the lower Yellow River during flood period

XU Jiong-xin (Institute of Geographical Sciences and Natural Resources Research, Beijing 100101, China)  
Based on the data from 144 flood events during the periods 1950-1960 and 1969-1985, this paper deals with sediment transport in the lower Yellow River The results show that the channel sediment delivery ratio (SDR) decreases with the increases in the event averaged sediment concentration and the "incoming sediment coefficient" expressed as sediment concentration divided by water discharge There is an optimal flood discharge of 4*#000*!m 3/s, at which the SDR reaches its maximum The event SDR is negatively correlated with the event maximum sediment concentration C max ; when C max is larger than 300*!kg/m 3, the SDR is smaller than 0 50, indicating that the SDR of hyperconcentrated flows is rather low The SDRs of floods coming from different source areas are different The floods whose runoff mainly came from the clear water area above Hekouzhen had a SDR larger than 0 60; those from the "fine sediment producing area" had a SDR larger than 0 50; those from the "coarse sediment producing area" had a SDR smaller than 0 50 The SDR of a given flood event is found to be related with the combination of sediment and runoff from different source areas; when the sediment from the coarse sediment producing area made up of 50% of the total, or the sediment from the fine sediment producing area made up of 40% of the total, the SDR of the flood events reached its maximum
【Fund】: 中国科学院地理科学与资源研究所知识创新工程领域前沿项目 (CXIOG A0 0 0 5 0 1 ) ;; 国家自然科学基金重大项目 (5 9890 2 0 0 )~~
【CateGory Index】: TV142
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