水科学进展2017，Vol.28Issue(3)：329-337,9.DOI:10.14042/j.cnki.32.1309.2017.03.002
长江中游城汉河段推移质输沙率计算公式
Research on bed-load transport formula in theCheng-Han Reach of the middle Yangtze River
摘要
Abstract
After the impoundment of Three Gorges Reservoir, the sediment transport in the reach from Chenglingji to Wuhan of the middle Yangtze River is dominated by the bed load which plays important roles in bed morphological changes, and correspondingly the suspended load discharge is reduced significantly.In this paper, the formula of calculating the bed load transport rate in the above-mentioned reach has been studied.Based on the measured data of Luoshan and Hankou hydrology station, an exponential relationship between sediment discharge of bedload and flow discharge was established, and the transport rates of bedload at these two hydrology stations were calculated by this new relationship day by day.The result shows that the transport rates of bedload at Luoshan and Hankou hydrology station are proportional to the flow discharge with the power of 0.91278.The multi-annual mean sediment discharges of bedload are 137×104 t and 152×104 t, respectively, which is focused in flood season.Finally, the modified Engelund, Einstein and Yalin formula based on the new relationship according to the measured data were examined.It is shown that the accuracy of each formula has been obviously improved after modification.The modified Yalin formula has the best performances;and then the modified Engelund formula;while the predictions of the modified Einstein formula were not as good as the former two.It is concluded that the modified Yalin formula is the most suitable for calculating the transport rate of bedload of Chenglingji-Wuhan reach, and can be used for the fluvial process analysis and numerical simulation of this reach.关键词
推移质输沙率/城汉河段/水文观测/公式检验与修正/长江中游Key words
transport rate of bedload/Chenglingji-Wuhan reach/hydrological measuring/examination and modification of formula/the middle Yangtze River分类
建筑与水利引用本文复制引用
姚仕明,王洪杨,毛北平..长江中游城汉河段推移质输沙率计算公式[J].水科学进展,2017,28(3):329-337,9.基金项目
国家自然科学基金资助项目(51339001 （）
51379018)The study is financially supported by the National Natural Science Foundation of China(No.51339001 （）
No.51379018). （）
