长江下游口岸直水道落成洲航道整治建筑物运行状况分析

Operation status of regulation buildings for Luochengzhou Waterway in lower straight reach of the Yangtze River

针对长江下游口岸直水道落成洲河段航道整治建筑物运行状况开展分析。对落成洲整治建筑物自交工以来的实测资料进行统计,结合河势演变分析、局部冲淤和水动力变化分析,研究建筑物的损毁特征及发展趋势,并对建筑物损毁原因进行探讨。结果表明,落成洲头部守护工程实施后有效减少了右汊分流比。但目前落成洲右汊LR_(1)、LR_(2)丁坝护底余排和LR_(1)、LR_(2)护底带已发生较大面积的损毁,减弱了落成洲右汊限流效果。工程实施后,落成洲右汊横向护滩带间水流紊乱,受到翻坝、绕坝等多种水流冲刷的影响,已形成了多个大范围的冲刷坑,致使排体边坡坡度增大或直接侵入排体,从而引发建筑物损毁。当前冲刷坑有进一步冲刷发展的可能,应持续关注局部冲淤发展变化和建筑物变化情况。

We conduct an analysis of the operational status of navigation structures in the channel regulation project of Luochengzhou section in the lower straight reach of the Yangtze River.Using statistical data from in-situ surveys conducted since the completion of Luochengzhou regulation buildings,combining with analyses of river regime,local sediment dynamics,and hydraulic changes,we investigate the characteristics and trends of buliding damage,and discuss the cause of damage.The results show that the protection project implemented in the Luochengzhou head area effectively reduces the distributary flow ratio of the right branch.However,significant damage occurs to LR_(1),LR_(2) spur dike protection mattress and LR_(1),LR_(2) bottom protection belt,weakening the flow restriction effect on the right branch.Post-project implementation,the turbulence in the right branch of the Luochengzhou Waterway leads to extensive erosion pits formed by various hydraulic actions such as dam flipping and circumventing flow.This results in increasing slope gradients or direct intrusion into the mattress,causing damage of building.The current erosion pits may further develop,underscoring the need for ongoing monitoring of local sediment dynamics and building changes.