2012年7月,长江流域先后出现4次强降雨过程,发生了4次洪水,其中朱沱江段水位超过历史实测最高记录,寸滩江段发生1981年以来最大洪水,三峡水库出现建库以来最大入库洪峰;长江上游干流宜宾至寸滩江段全线超过保证水位,中游干流石首至螺山江段及洞庭湖全线超过警戒水位。在调控“2012·07”洪水过程中,三峡水库有效降低荆江江段最高水位超过2m,洪湖江段超过1m,避免了长江荆江江段出现接近保证水位的高水位,缩短了长江中下游超警江段240km,大大减轻了中下游的防洪压力。 In July 2012, there were four heavy rains in the Yangtze River Valley and four floods occurred. Among them, the water level in the Zhuojiang section surpassed the highest recorded history, the largest flood occurred in the Cuntan section since 1981, and the largest since the Three Gorges Reservoir was established Flood peak storage; upper reaches of the Yangtze River Yibin to Cuntan River across the board more than the guaranteed level, the middle reaches of Shishou to Luoshan section and Dongting Lake across the warning level. During the flood control of “2012.07”, the Three Gorges Reservoir effectively reduced the maximum water level in the Jingjiang section by more than 2m and the Honghu section by more than 1m, avoided the high water level close to the guaranteed water level in the Jingjiang section of the Yangtze River and shortened the middle and lower reaches of the Yangtze River Super-police section 240km, greatly reducing the flood control pressure in the middle and lower reaches.