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对长江中游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.通过分析得知,洞庭湖区和螺山至汉口河段各时期多年平均泥沙淤积总量基本保持在180×106t,分沙比的减小调整了上述河段与洞庭湖区之间的淤积关系,使洞庭湖区减少淤积的泥沙转移到上述河段淤积。在此基础上对长江中游泥沙淤积与该区域水位抬高进行了计算分析。文章指出,长江中游防洪的核心是如何正确处理宜昌每年多来的 180 ×106t泥沙淤积问题。
The law of sediment transport in the middle reaches of the Yangtze River was comprehensively analyzed, and the quantitative relationship between sediment deposition ratio λv and sediment ratio λs of Luoshan-Hankou section and the Dongting Lake region was established. According to the analysis, the total amount of multi-year average sediment deposition in Dongting Lake area and Luoshan-Hankou reach remained at 180 × 106t. The decrease of sediment-carrying ratio adjusted the siltation relationship between the above reach and Dongting Lake area, So that silts in the Dongting Lake area will be reduced to silt in the above river sections. Based on this, the sediment deposition in the middle reaches of the Yangtze River and the elevation of water level in the area are calculated and analyzed. The paper points out that the core of flood control in the middle reaches of the Yangtze River is how to deal with the problem of sediment deposition of 180 × 106t annually in Yichang.