长江干流宜昌至大通段航行基准面适应性及调整思路

Navigation datum adaptability and adjustment thinking idea on Yichang to Datong River reach in the Yangtze River

随着上游水利枢纽的陆续修建,长江干流宜昌至大通段的来水来沙条件与河床发生了重大变化,航行基准面与枯水位出现了不同程度的偏离,因此有必要对航行基准面的适应性及调整思路进行研究。基于宜昌至大通河段现行航行基准面使用以来的流量、水位实测资料,分析最枯水位变化特点、原因及趋势,认为宜昌至枝城段航行基准面基本适应,而枝城—大通段航行基准面适应性较差。在此基础上,探讨航行基准面调整思路。

With the building-up of the upstream hydro-junctions,the coming water sediment conditions and the riverbed of Yichang to Datong River reach changed greatly, and the navigation datum and lowest water level appeared different degree of deviation.So it is necessary to study the adaptability and adjustment of the navigation datum.Based on the real-measured data of the discharge and water level since the use of the current navigation datum,the article analyzes variation characteristics,reasons and trend for the lowest water level,and realizes that the navigation datum of Yichang to Zhicheng River reach adapts well, but that of Zhicheng to Datong River reach is poor.Based on these,the article discusses the train of thought on the adjustment of the navigation datum.