2020年荆江三口分流分沙变化研究  

Research on flow and sediment diversion in three outlets along Jingjiang River

作　　者：徐长江 刘冬英 张冬冬 李妍清 XU Changjiang;LIU Dongying;ZHANG Dongdong;LI Yanqing(Bureau of Hydrology,Changjiang Water Resources Commission,Wuhan 430010,China)

机构地区：[1]长江水利委员会水文局,湖北武汉430010

出　　处：《人民长江》2020年第12期203-209,共7页Yangtze River

基　　金：国家重点研发计划项目(2017YFC0405302);三峡水库科学调度关键技术第二阶段研究项目(0704169)。

摘　　要：基于近60 a来的实测资料,对荆江三口历年分流分沙变化规律进行了深入的分析和研究。结果表明:20世纪50年代以来,荆江三口分流分沙量呈逐年减小的趋势。年际变化上,2003~2019年与1981~2002年相比,三口分流量和分沙量分别减少30%和90%,分流比也由15%减小至12%,分沙比变化不大。年内变化上,分流比减少主要集中在5~11月,分沙比变化较大的是4,5月和11月。2003年以后,在枝城50000 m 3/s条件下,三口分流能力基本没有发生明显变化。随着三峡水库及上游水库群运行后,长江中下游干流河道的冲淤变化,三口分流分沙情况的变化还有待进一步观测和分析。Based on measured data in the past 60 years,the variation of flow and sediment diversion in the three outlets along Jingjiang River has been researched deeply.The results showed that since 1950s,the flow and sediment diversion has been decreasing year by year.Compared with the period from 1981 to 2002,the flow and the sediment of the three outlets have reduced by 30%and 90%,respectively.The flow ratio has also reduced from 15%to 12%and the ratio of sediment has not changed much.The flow ratio decreased mainly from May to November,and the ratio of sediment changed mainly in April,May and November.After year of 2003,the capacity of flow diversion in the three outlets along Jingjiang River has not changed obviously under the condition of 50000 m 3/s at Zhicheng Station.With the change of erosion and deposition of the Yangtze River after the impoundment of the Three Gorges Reservoir and other reservoirs in the upstream,the change of three outlets along Jingjiang River needs further observation and analysis.

关 键 词：荆江三口 分流比 分沙比 三峡水库 

分 类 号：TV148[水利工程—水力学及河流动力学]