长江下游三益桥浅滩整治工程方案研究

Study of regulation schemes of Sanyiqiao Shallow in Lower Yangtze River

三益桥浅滩位于长江下游扬中河段左汊进口段,属典型的过渡段沙质浅滩,三益桥浅滩段北岸为著名的嘶马崩岸段,该段内既有汊道分流,又存在淮河入流,其水流、泥沙运动特征和河床变化十分复杂。基于河床演变分析和模型试验相结合的方法,分析了三益桥浅滩演变特征以及浅滩成因,确立了浅滩整治思路,提出了3个整治方案,并进行了整治方案效果试验研究,分析研究整治方案实施后,对航道条件的改善以及对工程河段河势可能产生的影响。

The Sanyiqiao Shallow, located at the entrance of the Yangzhong reach, is one typical transitional shoal. Its left side is the Luochengzh0u braided reach and its right side is the river mouth of the Huaihe River. Therefore, the dynamic characteristics of water flow and sediment and the change of river bed of the Sanyiqiao Shallow are very complex. Based on the analysis of river bed evolution and the physical model test, the evolu- tion characteristics of the Sanyiqiao Shallow in recent period and the navigation obstacle character and the cause are analyzed, and the regulation idea and the regulation schemes of the Sanyiqiao Shallow are estab- lished. According to the results of model test, the regulation effects after the implement of the recommended structures and the effects on river regime of the Yangzhong reach are analyzed.