长江下游牧鹅洲水道河床演变特征及航道条件分析

Analysis of evolution characteristics and channel conditions of the Mu'ezhou waterway of lower reaches of the Yangtze River

随着三峡水库持续运行,下游河段造床规律较以往有所变化,河床进行冲淤调整。基于牧鹅洲洲水道三峡蓄水后2003—2016年原型观测资料,分析蓄水后该水道河床的冲淤变化情况。结果表明,该水道呈中高滩冲刷、低滩淤积、河槽有冲有淤的态势,这可能给本水道自身较好的航道边界条件带来不利影响,同时极可能影响下游湖广水道进流条件。在此基础上,对本水道航道条件变化趋势进行预测,认为目前比较优良的航道条件在自然作用下可能向不利方向发展,为本水道航道治理思路的形成和工程设计提供参考。

With the continuous operation of the Three Gorges reservoir,the regulation of bed making in the lower reaches of the river has changed,and the river bed has been washed and silted.Based on the latest prototype observation data of the reach after construction of the Gorges project in 2003—2016,we analyze the changes about the channel bed.The results show that the water channel has the tendency of erosion and silting in low beach,which can have adverse effects on the boundary conditions of the channel itself. It is very likely to affect the inflow conditions of the Huguang waterway.On the basis of analysis,we make a forecast of the trend of waterway channel condition,and believe that the current favorable channel condition exists in the negative direction under the natural action.The results can provide reference for the channel regulation ideas and engineering design in the project.