长江干流堤防隐患之一咸宁河段河床演变分析

长江中游咸宁河段，上承荆江、洞庭湖水系及陆水河来水，下游受汉江洪水的顶托，其地理位置的重要及形势之险恶，不亚于著名的荆江。经河床演变分析，认为总体河势处于相对稳定状态。但局部地段将有所调整，近岸河床将发生冲刷、岸线崩退；未护岸地段可能发生崩岸；主流逼岩的已护岸工程地段可能发生吊坎、滑坡现象。建议应加紧进行险工段工程措施，妥善解决堤防的隐患。

The Dyke Defects of Main Flood Channel and Analysis of River Bed Evolution for Xianning Stretch in the Midstream of Yangtze River

Xianning river stretch in the midstream of Yangtze River in Hubei Province totals 54km long.Through the analysis of river bed evolution,it is considered that the river regime of the stretch is considerablly stable in general.But local section will be made regulation to some extent,as a result,the scour of nearbank river bed and the collapse and recession of bank line will happen,the bank failure may take place for the section without protection works,and the hanging bodies and landslide may occur for the section with protection works near the main flood channel.It is suggested that the engineering measures should be adapted for the dangerous river stretches to resolve the dyke defects.