关键词: 荆江三口; 分流比; 分沙比; 三峡水库;

Abstract: 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 50 000 m3/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.

Key words: three outlets along Jingjiang River; flow diversion; sediment diversion; Three Gorges Reservoir;