龙溪口枢纽最低蓄水位下船闸上游通航条件及改善措施

Flow conditions for navigation and improvement measures of upstream of ship lock under lowest water level of Longxikou Junction

岷江龙溪口航电枢纽工程第3期导流期间利用右岸船闸临时通航,由于上游蓄水位相对较低,汛期大流量条件下船闸上游引航道口门区与连接段水域存在较大的通航风险。为确保施工期通航安全,结合枢纽施工导流及通航模型试验结果,开展了最低蓄水位下船闸上游通航条件数值模拟研究,并提出优化上引航道左导墙结构形式、降低鸡公嘴开挖高程以及抛填深沱等工程措施。结果表明,上游通航水流条件明显改善,可满足施工期通航要求。

During the third phase diversion period of Longxikou Navigation-power Junction project in the Minjiang River,the ship lock arranged on the right bank will be used for temporary navigation.Due to the relatively low upstream water level,there is a large navigation risk in the entrance area and connecting section of the upstream approach channel of the lock under the condition of large flow in flood season.To ensure the navigation safety during the construction period,we carry out the numerical simulation study on the navigation conditions at the upstream of the ship lock under the lowest pool level in combination with the results of the diversion and navigation model test of the junction construction,and propose the engineering measures such as optimizing the left guide wall structure of the upper approach channel,reducing the excavation elevation of Jigongzui and filling the deep pool.The results indicate that the upstream navigation flow conditions are significantly improved,which can meet the navigation requirements during the construction period.