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三峡工程二期围堰形成后在坝址上游产生壅水。与一期围堰比较 ,壅水高度及壅水量随流量增大而增大 ,从坝址向上游递减。以流量 6 0 0 0 0m3 /s时为例 ,茅坪 (二 )水尺壅水高度为 3.0 8m ,楠木园水尺壅水高度为0 .36m ,回水末端在巫山 ,整个库区壅水量 0 .6 4786亿m3 。说明二期围堰有一定的蓄滞洪能力 ,但蓄滞洪量不大。二期围堰形成后 ,明渠的实际泄流能力在低水时小于设计值 ,在中高水时大于设计值 ,明渠落差也小于设计值。说明明渠的过流能力比设计要大且有利于明渠通航
After the formation of the second phase of the Three Gorges Project, creek water is generated in the upstream of the dam site. Compared with the first cofferdam, the water height and water volume increased with the increase of flow rate, decreasing from the dam site to the upstream. Taking the flow rate of 60000m3 / s as an example, the height of the water level in Maoping (II) is 3.08m, the height of the water level in Nanmu Park is 0.36m, the water return end is in Wushan, the water volume in the entire reservoir 0,678.6 billion m3. Indicating cofferdam has some storage detention capacity, but not large flood storage. After the formation of the second phase of cofferdam, the actual discharge capacity of open channel is lower than the designed value at low water level, greater than the designed value at mid-high water level and less than the designed value at open channel. It shows that the overcurrent capacity of open channels is larger than that of designed ones and is conducive to the open channel navigation