【摘要】 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泥沙淤积问题更多还原

【Abstract】 Based on the continuous equation of sediment transport and comprehensive analyzing of field data from middle Yangtze River, a relationship between λ V (sediment deposition ratio of Luoshan\|Hankou reach to Dongting Lake) and λ S (sediment diversion ration from Yangtze River to Dongting lake) is obtained. The study shows that total amount of sediment deposition in the region remain around 180 million tons. Decreasing of λ S not only leads to the amount of sediment deposition reduction in the Dongting lake, but also increasing amount of sediment deposition from Luoshan to Hankou reach and also elevating the water level in the middle reach of Yangtze River. So the key to relieving the flood disaster in the middle Yangtze River is how to eliminate the 180 million tons sediment deposition in this region.更多还原