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| Definition on source area of centralized coarse sediment in middle reaches of Yellow River with method of marginal analysis |
| Xu Jianhua,Jin Shuangyan,Zhang Cheng,Lin Yinping |
| Hydrologic Bureau,YRCC,450004,Zhengzhou,China |
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Abstract In order to investigate and control the centralized coarse sediment source area where is the greatest damage to filling of main channel in the lower reaches of Yellow River,according to the size fraction of deposit in the main channel before 1960 in which Sanmenxia reservoir not be operated,that 0.1mm is the limit of coarse sediment in the source area of centralized coarse sediment in middle reaches of Yellow River is concluded.Based on the method of marginal analysis,it is calculated that the centralized source area of coarse sediment is 18.8 thousand km2,although the area is 23.9% of overloaded and coarse sediment region,the sediment discharge of total load,grain size larger than 0.05mm and 0.1mm is 34.5%,47.6% and 68.5% of the corresponding period of overloaded and coarse sediment region.
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Received: 04 January 2006
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