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葛洲坝枢纽的主体工程大坝,横穿由葛洲坝、西坝分隔着的大江、二江和三江,而大江、二江和三江坝址处缺测水位流量资料。为满足工程规划、设计和施工所需的坝址水位流量关系,取用下游附近宜昌水文站实测的水位流量资料,应用水力学原理,计算了多汊道分流流量和水面线,从而确定大江、二江和三江坝址处的水位流量关系及其分流比值。一、坝址附近的河道概况坝址河段,上起南津关,下迄宜昌,全长8710米。上端南津关处河道狭而深,一般洪水河宽约300米,最大水深80～90米。出南津关峡谷后,河面骤然展宽达1000多米,最大水深
The main dam of Gezhouba Dam will cross the Great River, the Second River and the Sanjiang River separated by the Gezhouba Dam and the Xiba Dam, and the missing water flow data at the Dajiang, Erjiang and Sanjiang dam sites. In order to meet the relationship between dam site water level and flow rate required for project planning, design and construction, taking the measured water level and flow data near Yichang Hydrometric Station downstream, the diversion flow rate and surface water level were calculated by applying the principle of hydraulics, Relationship between water level and discharge at two dam and Sanjiang dam sites. First, the dam site of the river near the dam section of the river, starting from the South Tianjin off, until Yichang, a total length of 8710 meters. On the top Nanjinguan Department of narrow and deep river, the general width of 300 meters flood, the maximum depth of 80 to 90 meters. Out of the South Jin Guan Canyon, the river suddenly widened more than 1,000 meters, the maximum depth