岸滩侧蚀对航道条件影响的三维数值模拟——以长江中游太平口水道为例

发布时间：2018-02-02 21:45

本文关键词： 岸滩侧蚀航道三维数值模拟长江中游　出处：《水科学进展》2017年02期 　论文类型：期刊论文

【摘要】：长江中游河道岸滩侧蚀现象普遍,易对航道稳定形成不利影响,深入研究岸滩侧蚀冲刷机理及其航道响应过程具有重要意义。建立了考虑相邻土体影响的黏性岸滩侧蚀坍塌力学模式,以长江中游太平口水道为例,基于局部网格可动技术,构建了岸滩侧蚀及其河床冲淤变化的三维水沙动力学模型;在模型验证相似的基础上,分析了清水冲刷条件下腊林洲边滩侧蚀对太平口水道航道格局的影响。研究结果表明:模型可较好地模拟由岸滩侧蚀所引发的河势演变过程;上游来沙减少后,太平口水道河床以及未守护低滩部位将进一步产生冲刷;腊林洲边滩稳定与否,对太平口水道"南槽-北汊"航道格局的稳定具有重要作用。
[Abstract]:The shoreline side erosion in the middle reaches of Yangtze River is common, and it is easy to affect the channel stability unfavorably. It is of great significance to study the erosion mechanism and channel response process of shoreline side erosion. A mechanical model of lateral erosion collapse of viscous shoreline considering the influence of adjacent soil is established, taking the Taiping mouth channel in the middle reaches of the Yangtze River as an example. Based on the local grid movability technology, a three-dimensional hydro-sediment dynamic model of shoal side erosion and its riverbed scour and deposition change is constructed. On the basis of similar model verification. The effects of lateral erosion on the channel pattern of Taiping mouth Channel under the condition of clear water erosion are analyzed. The results show that the model can well simulate the river regime evolution process caused by shoreline side erosion. After the decrease of upstream sand, the bed of Taiping mouthwater channel and the part of unguarded low beach will be further scoured. Whether the banks of Laolin Island are stable or not plays an important role in the stability of channel pattern of Taiping mouthwater channel.
【作者单位】：南京水利科学研究院水文水资源与水利工程科学国家重点实验室;中交疏浚(集团)股份有限公司;
【基金】：国家自然科学基金资助项目(51579151;51679147)~~
【分类号】：U612
【正文快照】： 长江中游河道岸滩侧蚀引起河床横向变形的现象十分普遍,易对航道稳定形成不利影响,如沙市河段、窑监河段和戴家洲河段等均因此而造成航道条件恶化。三峡枢纽蓄水运行以来,清水下泄,出库沙量大幅减少,坝下河段河床将发生长距离、长时段自上而下的冲刷,使得局部深槽冲深、近岸坡

【参考文献】