长江荆江河段弯道凸岸边滩非典型冲刷研究

针对近年来荆江河段凸岸边滩年际间基本处于持续冲刷的非典型演变特征，利用资料对弯道段凸岸边滩不同阶段的演变特点进行分析，以期找出引起非典型冲刷的原因。结果表明，发生非典型冲刷的主要原因有三峡工程蓄水运用后荆江河道来沙量的大幅度减少、弯道主流线向凸岸方向发生明显摆动和中枯水期波浪的淘刷影响，其中最主要的原因是来沙量大幅度减少。建议对凸岸边滩进行适当护滩以缓解非典型冲刷引发的防洪与航运问题。

Study of atypical erosion of convex bank of river bend in Jingjiang Reach of Yangtze River

According to the fact that the annual variation of convex bank of river bend in Jinjiang Reach was in continuous erosion in recent years,the evolution characteristics of the convex bank in different stages was analyzed so as to find out the main causes.The results showed that the main causes included obvious decrease of incoming sediment of Jingjiang Reach after impoundment of TGP,the mainstream line of the river bed swinging to the convex bank,the eroding of the waves in medium and dry period,among which,t...