三峡工程对“07.7”洪水调度的作用分析

2007年7月末，长江上游发生较大洪水，根据预报分析，若三峡工程不拦蓄洪水，荆江河段各站洪峰水位将超过警戒水位。为缓解荆江河段的防汛压力，决定启用三峡工程进行拦洪削峰调度。通过洪水还原计算，分析了三峡水库调度对下游河段防洪的影响。三峡水库实施防汛错峰调度后，水库最高库水位为146.10 m，拦蓄水量约10.13 亿 m3，宜昌洪峰流量为50 800 m3/s、沙市洪峰水位为42.97 m。根据洪水还原分析，此次调度削减宜昌洪峰流量约1 700 m3/s，降低宜昌及荆江河段各站洪峰水位0.3 m左右，成功完成拦洪削峰调度任务，使荆江河段各站洪峰水位基本控制在警戒水位以内。

Analysis on regulation role of TGP in"07.7"flood of the Yangtze River

In the end of July,a large flood occurred in the upstream of the Yangtze River.According to hydrological forecast,if the TGP reservoir is not used to retain the flood,the water levels of whole reach of the Jingjiang River will surpass the warning water level.In order to mitigate flood control pressure of the Jingjiang River reach,TGP was put into operation for reducing flood peak.Through flood restoration,the influence of TGP reservoir regulation on downstream flood control was analyzed.After the regulation...