新型桩基导流屏改善船闸下游口门区通航条件效果分析

Effect analysis of a new type of pile foundation diversion vanes to improve navigation conditions in downstream entrance area of ship lock

五强溪枢纽船闸下游引航道口门区碍航问题一直是制约沅水高等级航道畅通的瓶颈。采用定床水流物理模型试验手段,分析河段现状通航水流条件及碍航特性。在桩基透空式隔流堤改善方案的基础上,提出了改善口门区通航条件的桩基导流屏方案,即通过阻挡和疏导水流相结合的方式来削弱口门区的斜向水流。方案实施前后试验成果对比表明,桩基导流屏对改善口门区斜流碍航具有较好的效果。

The channel entrance area obstruction of the downstream of Wuqiangxi junction has been a bottleneck that restricts the smooth passage of Yuanshui high-grade.Based on the test method of the physical model of the fixed bed flow,the current condition and the impeding characteristics of the river are analyzed.On the basis of the improvement plan of the permeable breakwater of the pile foundation,the plan of pile foundation diversion vanes for improving the navigation condition of entrance area is put forward.The oblique flow in the entrance area is weakened by combining barrier and diversion.Comparison of the test results before and after the implementation of the plan shows that the pile foundation diversion vanes has better effect on improving the navigation obstruction of oblique flow in the entrance area.