荆江三口分流能力变化分析

三峡水库蓄水前，荆江三口洪道逐渐淤积萎缩，分流比沿时程减小；三峡水库蓄水运行后，三口洪道发生了普遍冲刷，导致分流能力发生变化。为进一步了解其演变趋势，以便实施合理的综合整治，利用水沙数据、河道地形资料及已有的研究成果，探讨了影响三口分流能力的主要因素。分析结果表明，荆江三口分流总体呈现逐渐减小趋势，在三峡水库蓄水初期高水分流能力有所增强。

Analysis on change of flow diversion capacity of three channels of Jingjiang River

Before the impoundment of Three Gorges Reservoir, the three diversion channels from Changjiang River to Dongting Lake shrank gradually. After the operation of Three Gorges Reservoir, three channels are scoured and the diversion capacity changed. To further understand the evolution trend of the three channels and take reasonable and comprehensive measures, the water level, discharge and variation tendency of the diversion capacity of the three channels are analyzed by using the flow and sediment data, topographic data and the previous research results. The analysis results show that the diversion capacity of the three channels decreased in general, however in the initial impoundment period of Three Gorges Reservoir, the diversion capacity increased in flood season.