长江佛耳岩河段河床演变特点分析

Analysis on riverbed evolution characteristics of Fo'eryan reach of Yangtze River

基于3个测次实测资料,对长江佛耳岩河段河床演变特点进行了分析,主要包括平面及纵、横断面的变化规律。结合三峡水库的调度及河段内小南海航电枢纽规划建设带来的河道水沙条件和边界条件的变化,对未来该河段的演变趋势进行了预估。分析认为,长江佛耳岩河段属于山区河流,受地质构造的影响,长期以来河床相对比较稳定;近年来,河段局部出现了一些调整,但变化幅度较小;由于佛耳岩河段位于三峡水库变动回水区末端,基本不受三峡水库的影响,河床泥沙冲淤变化仍遵循天然河道年内汛期淤积汛后冲刷、年际间冲淤基本平衡的规律,但受河段内规划的小南海航电枢纽建设的影响,后期该河段河势可能会出现一定调整。

Based on the measured data from 3 measurements, the paper analyzes the riverbed evolution characteristics of Fo＇ eryan reach of the Yangtze River, including the change law of cross - sections of riverbed. Furthermore, the future evolution trend of this reach is predicted according to the changes of water and sediment conditions with consideration of the operation of Three Gorges Reservoir and the construction of Xiaonanhai Hydro - complex. The analysis results reveal that the riverbed of Fo＇ eryan reach is relatively stable for a long time due to the influence of geological condition. As the reach is located at the end of the fluctuating backwater region of Three Gorges Reservoir, its evolution would not be affected by the operation of the reservoir, and the change law of scouring and sedimentation is consistent with that of natural rivers. However, there will be some varieties and adjustment after the construction of Xiaonanhai Hydraulic Complex.