长江江都段嘶马弯道丁坝改造研究

Renovation of Spur Dike of Sima Bend in Jiangdu Segment of Yangtze River

为加强长江下游江都段嘶马弯道堤防安全及岸坡稳定,以长江中下游干流的长江嘶马弯道为研究对象,分析了该弯道段的基本情况和目前存在的一些问题,针对弯道内2处丁坝提出改造方案,并通过正态物理模型试验进行研究。结果表明,拆除丁坝的改造方案对目前稳定河势的目标最为有利,丁坝上游水位降低一般在2 cm以内,下游水位抬升在2 cm以内,丁坝高度和长度减半对水位影响范围均小于丁坝拆除的影响。

In order to strengthen the embankment safety and bank slope stability of Sima Bend of Jiangdu segment in the lower reaches of Yangtze River, we proposed renovation plan for two spur dikes in the bend via normal physical model test based on analysis of its existing problems. Results show that removing the spur dikes is the most favorable plan for the stability of the river regime. The water level of the upstream of the spur dike generally reduces within 2 cm, while in the downstream lifts by less than 2 cm. The influence of halving the height or length of spur dike on the water level is smaller than that of removing spur dikes.