中文摘要：

三峡水库蓄水运用后,下游河段发生河流再造床过程,河床进行冲淤调整。基于芦家河河段三峡蓄水后2003—2008年原型观测资料,分析了蓄水后该河段的冲淤变化情况。结果表明该河段在三峡蓄水后总体处于冲刷状态,石泓较之沙泓冲刷严重,碛坝尾部大范围冲刷,这对河段沙石泓分流比产生较大影响,进而影响航道。本河段有些部位抗冲刷能力强,冲刷下切并不明显,这可作为宜昌枯水位在三峡水库蓄水运用后没有大幅度下降的因素之一。

英文摘要：

Since the impoundment of Three Gorges reservoir, water and sediment to the downstream reach has changed, resulting in the process of river transformation on the Changjiang-Lujiahe river and erosion of the bed. Based on the latest prototype observation data of the reach after construction of the Three Gorges project, we analyzed the silting and erosion of river bed of this micro-bending and bifurcated reach. The result shows that the river bed has eroded in general and the right branch of shingle flat scours more than the left. the tail part of shingle flat scours in large area, and it has an unpredictable effect on the diversion ratio and navigation on this reach. Some part of this reach eroded only a little, they have a strong anti-scour ability, which is one of the main reasons for the less drop of dry water level after the mpoundment of the Thress Gorges reservoir.