古顶水利枢纽二线船闸下引航道布置物理模型试验研究

Experimental study on physical model of lower approach channel layout of Guding water conservancy hub second-line ship lock

多线船闸布置中引航道口门区及连接段通航水流条件是一个重要的研究课题。以古顶水利枢纽二线船闸通航水力学试验为例,研究古顶二线船闸在修建背景下,船闸下引航道口门区及连接段通航水流情况。试验结果表明,口门区及连接段回流及横流流速超标。因此,从布置导航墙、疏浚引航道连接段两方面着手,提出多种优化布置方案,并推荐布置70m外挑导航墙(50m直墙+20m外挑)和疏浚连接段相结合的方式。研究成果为古顶水电站二线船闸的优化布置提供了参考。

The navigable flow condition of the entrance area and connecting section of the approach channel in muti-line ship locks is a key research topic.Taking the navigation hydraulics test of the second-line lock of Guding water conservancy hub as an example,this paper studies the navigable flow conditions in the entrance and connecting section of the lower approach channel under the background of the construction of Guding second-line lock.The test results show that the velocity of reflux and cross flow in the entrance and connecting section exceeds related standard.Therefore,from the two aspects of layout of navigation wall and dredging approach channel connection section,this paper puts forward a variety of optimal layout schemes,and recommends the combination of layout of 70 m external cantilever navigation wall (50 m vertical wall+20 m external cantilever) and dredging connection section to improve navigable environment.The research results provide a reference for the optimal layout of the second line lock of the Guding hydropower station.