长江扬中河段指南村窝崩原因分析

Analysis on the causes of arc collapsing in Zhinan Village Yangzhong Reach of the Yangtze River

2017年11月8日发生在长江扬中河段指南村附近的窝崩,造成了 400多米主江堤坍塌的险情。归纳了现有窝崩机理的三种观点、,指出了各观点的不足之处;分析了指南村窝崩前水文条件及河床地形变化,结合地勘资料,认为水流挟沙量不足,水流与河岸交角较大,造成了河床局部持续冲深,深泓贴岸,岸坡变陡,遭遇到稳定性差的河岸地质时,导致窝崩的发生。

On November 8,2017,the arc collapsing near the Zhinan Village in the Yangzhong Reach of the Yangtze River,resulted in the collapse of the main river embankment of more than 400 meters.Three views on the mechanism of arc collapsing were summed up and the shortcomings of each view was pointed out.The hydrological conditions and the change of riverbed topography before the arc collapsing in Zhinan Village were analyzed.Based on the geological survey data after considering that the flow carried less sand and the angle between the flow and the bank was large,which resulted in the local continuous scouring depth of the river bed,the thalweg closing to the bank,the bank slope becoming steep.Therefore,when the stability of bank geology was poor,the arc collapsing occurred.