中文摘要：

三峡工程运用以来,长江荆江河段水沙条件发生较大改变,河床冲淤变化剧烈。沙市河段地处上荆江中段,属弯曲分汊河型,多年来深泓左右摆动和分汊段主支汊易位频繁,是荆江河势变化频繁、防洪形势严峻的河段之一。利用多年来,特别是三峡工程蓄水后的原型实测资料,首先分析了河段控制水文站的水沙特性及太平口分流分沙变化,并进一步分析了三峡工程运用以来沙市河段的河道冲淤演变特点及演变趋势,在此基础上综合考虑河段的防洪、航运、取水等需求,探讨了沙市河段未来的综合治理思路。

英文摘要：

Since operation of the Three Gorges Project（ TGP） in the Yangtze River,flow and sediment conditions of the Jingjiang reach change significantly,and channels suffer drastic scouring. The Shashi river reach,located on the upper middle of the Jingjiang reach,is a typical meandering braid river. Over the years,swing of the thalweg and alternation of the main channel and sub-branches happened frequently. The Shashi river reach is one of the reaches in the Jingjiang reach with frequent river regime variation and severe flood protection situation. Based on prototype data,the variation of the flow and sediment at the Shashi Hydrological Station and variations of flow and sediment diversion of the Taipingkou are analyzed. River channel processes of the Shashi river reach after the operation of TGP is examined. To meet the requirements of river flood protection,navigation and water intaking,and other tasks,the ideas of comprehensive regulation of the Shashi river river in the future are discussed.