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本文对长江中游近期泥沙输移规律进行了综合分析 ,建立了螺山至汉口河段和洞庭湖区泥沙淤积比λV与三口分沙比λS 之间的定量关系。通过分析得到洞庭湖区和螺山至汉口段各时期多年平均泥沙淤积总量基本保持在 1 80× 1 0 6t ,分沙比的减少调整了螺山至汉口河段与洞庭湖区之间的淤积关系 ,使得洞庭湖区少淤积的泥沙转移到螺山汉口河段淤积 ,抬高了长江中游地区的水位。因此 ,长江中游防洪的核心是如何处理宜昌每年多来的 1 80× 1 0 6t泥沙淤积问题
In this paper, a comprehensive analysis of sediment transport in the middle reaches of the Yangtze River has been carried out. The quantitative relationship between sediment deposition ratio λV and sediment ratio λS of Luoshu-Hankow reach is established. Through the analysis, the total amount of multi-year average sediment deposition in Dongting Lake area and Luoshan-Hankou section remained at 1 80 × 10 6 t in each period, and the decrease of silt-sedimentation ratio adjusted the siltation between Luoshan-Hunchu and Dongting Lake areas The result is that less silting sediment in Dongting Lake area is transferred to the Hulaou River, silting up and raising the water level in the middle reaches of the Yangtze River. Therefore, the core of flood control in the middle reaches of the Yangtze River is how to deal with the problem of sediment deposition of 1 80 × 10 6 t annually in Yichang