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葛洲坝水利枢纽于1970年元月动工,1971年4月建成第一期围堰工程,二、三江断流。1981年元月4日大江截流,同年5月开始蓄水,水位从46m分三次蓄到60m;1983年5月又分三级升高到63.5m;1986年6月蓄水位又抬高到66m。考虑葛洲坝枢纽系迳流式电站,蓄水后对下游河道的影响不太长,此次仅对宜昌(宜34)～陈家湾(荆29)全长133km河段进行河道冲淤分析。应用1957年～1985年所测二十个测次共计951个固定断面资料进行冲淤量计算。计算分10000m~3/s流量下的基本河槽;30000m~3/s流量下包括一般边滩在内的河槽;50000m~3/s流量下的平滩水位下的河槽。在分析河道历年冲淤变化时,根据
Gezhouba Dam started construction in January 1970, and the first cofferdam project was completed in April 1971, with the second and third rivers breaking off. On January 4, 1981, the river was closed and the water began to accumulate in May of the same year. The water level was raised from 46 m to 60 m three times and increased to 63.5 m in three stages in May 1983. In June 1986, the water level was raised again to 66m. Considering the Gezhouba Hydropower Station, the impact on the lower reaches after impoundment is not so long. This time, only the 133km stretch of Yichang (Yic 34) to Chenjiawan (Jing 29) will be used for river scouring and silting analysis. A total of 951 fixed section data from 20 surveys measured from 1957 to 1985 were used to calculate the amount of scour and silt. Calculate the basic channel under the flow rate of 10000m ~ 3 / s, the channel including the general beach at the flow rate of 30000m ~ 3 / s and the channel under the flat beach water level under the flow of 50000m ~ 3 / s. In the analysis of changes in the river scouring and silting calendar years, according to