中文摘要：

三峡水库175m高水位蓄水运行后,将引起相关河段水动力条件显著变化,改变水沙结构,为了研究变动回水区的调整规律,文章选择娄溪沟河段作为研究对象,借助SMS软件对研究河段建立平面二维水流数学模型,对河段水动力条件的变化、主要淤积部位、总淤积量等方面进行了分析。结果表明,蓄水后该河段呈累积性淤积趋势,随着河床抬高,过水断面减小,淤积趋势减缓,直至出现新的冲淤平衡。

英文摘要：

The impoundment of the Three Gorges reservoir will cause changes of hydrodynamic condition significantly,change the structure of water and sediment. In order to study the changes of the backwater region adjustment rules,taking Louxigou reach as research object,two-dimension numerical model of research reach is established by SMS software,the change of hydrodynamic condition,the main deposition area,total sedimentation are analyzed. The research results show that the reach presents cumulative deposition trend,water cross section decreasing with riverbed rising until a new equilibrium between scouring and deposition appears.