下荆江窑监河段河床演变及整治初步研究

Evolution and regulation of Yaojian reach in the middle Yangtze River

摘要: 三峡水库蓄水后,改变了下游来水来沙条件,河床演变也相应发生变化.长江中游窑监水道属典型的弯曲分汉河型,在分析三峡蓄水运用前后河床演变的基础上,采用二维水沙数学模型预测了三峡工程蓄水运用后20a河床演变趋势.计算表明,窑监河段主流仍保持在乌龟洲右汉,主支汉的河势没有发生变化,虽然整个河段呈冲刷趋势,但出浅碍航段航深随着枯水位降落有减小的趋势.在对历史演变分析及演变趋势预测的基础上,利用建立的数学模型研究了航道整治方案.

Abstract: Owing to the impoundment of the Three Gorges project(TGP),water and sediment conditions,as well as the evolution process,in the downstream of the dam have been changed.The Yaojian reach in the middle Yangtze River is chosen as a typical example of meandering and bifurcated channels.A 2D flow-sediment mathematical model of the Yaojian reach is developed in the study.The bed erosion and deposition in the following 20 years after the impoundment of TGP are calculated and analyzed according to the historical da...