岷江老木孔航电枢纽工程施工期坝区通航方案及通航水流条件研究

Navigation schemes and flow conditions in dam area of Laomukong navigation-power junction in Minjiang River during construction period

老木孔航电枢纽是岷江干流下游乐山—宜宾162 km河段近期开发4个航电梯级中的第1级,其施工期的通航条件将直接关系到岷江乐山—宜宾段大件船舶运输。为保障施工期岷江航道畅通,施工一期采用左岸扩挖明渠临时航道通航。采用水工物理模型试验与船模试验相结合的研究方法,对施工一期第1个枯水期三江村左汊通航期枢纽坝区通航方案及通航水流条件进行系统研究,提出左岸扩挖明渠疏浚、明渠进口段布置、明渠下游出口及连接段布置推荐方案,以及相应的通航水流条件特征参数。结果表明:老木孔枢纽施工期坝区推荐布置方案通航水流条件良好,获得的最小和最大通航流量满足施工期通航要求。

Laomukong navigation-power junction ranks the first among the four recently developed navigation-power junctions in the 162 km reach from Leshan to Yibin in the downstream Minjiang River.The navigation conditions during the construction period will directly affect the transportation of large ships in the reach.To ensure smooth shipping in Minjiang River during the construction period,the temporary open channel expanded at the left bank is available for navigation during construction period I.This paper adopts the method of combining hydraulic physical model tests with ship model tests to systematically study the navigation schemes and flow conditions in the dam area during the navigation period of the left branch of Sanjiang Village in the first dry season during construction period I.The paper also proposes the recommended schemes of expanding the open channel in the left bank for dredging,designing the inlet reach of the open channel,and arranging the downstream outlet of the open channel and connecting reach,as well as corresponding characteristic parameters of the navigation flow conditions.The results show that the recommended schemes for the dam area of Laomukong junction during the construction period ensure excellent navigation flow conditions,and the minimum and maximum navigation flows meet the navigation requirements during the construction period.