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自葛洲坝工程兴建以来 ,坝下宜昌河段枯水期水位逐年下降 ,使葛洲坝工程三江航道的通航受到影响。调查和分析表明 ,宜昌河段枯水期水位下降的原因主要有以下几个方面 :①长江中游荆江河道人工裁弯的影响 ;②宜昌河段第 1期护岸工程的影响 ;③宜昌河段内大量开采建筑骨料的影响 ;④葛洲坝兴建的影响。模型试验结果表明 ,通过治理宜昌站断面至烟脂坝间的河床 ,改变临江溪断面的控制水位等办法可以改善宜昌河段枯水期的通航水流条件。
Since the construction of the Gezhouba Dam, the water level of the Yichang reach during the dry season has been declining year by year, which has affected the navigation of the Sanjiao Channel of the Gezhouba Dam. The investigation and analysis showed that the reasons for the decrease of water level during the dry season in Yichang reach are as follows: (1) the influence of artificial cutting of Jingjiang River in the middle reaches of the Yangtze River; (2) the influence of the revetment project of Yichang River No. 1; (3) The impact of building aggregate; ④ Gezhouba construction impact. The model test results show that the conditions of the navigation flow in the Yichang reach can be improved by controlling the riverbed between Yichang station and Yanzhi dam and changing the control level of Linjiang river section.