三峡水库蓄水后尺八口水道弯道段演变特性

针对三峡水库下游尺八口弯道段在三峡水库蓄水后的新水沙条件下,出现凸冲凹淤(撇弯切滩)的现象,采用原型资料分析、理论分析、数学模型等多种方法,对其演变机理进行研究。结果表明,三峡水库下游尺八口河段发生凸冲凹淤现象的主要影响因素为三峡水库蓄水运用后来水来沙条件的变化,并预测凸冲凹淤的现象持续发展的可能性较大。

Evolution of Chibakou waterway bend after impoundment of Three Gorges Reservoir

This paper studies the evolution mechanism of concave scour and convex sedimentation of Chibakou waterway bend downstream the Three Gorge Reservoir under the new conditions of water and silt,and adopts the methods such as prototype observed data analysis,theoretical analysis and mathematical model to analyze the bend evolution mechanism.The results show that the water and sediment conditions changed by impoundment of Three Gorge Reservoir are the main influencing factors for bend evolution,and it is also predicted that the phenomenon of concave scour and convex sedimentation is likely to develop continuously.