五台梁清礁工程整治效果分析

Effect analysis of Wutailiang reef removal project

在三峡水库消落期和汛期河道恢复至天然状态时,五台梁礁石突出碍航,制约航道发展,亟需实施清礁整治。考虑近期航道建设和远期扩能提升需求,拟定了一次性整体切除清礁方案,并采用数值模拟方法对方案整治效果进行预测分析。结果显示:1)工程实施后,清礁区水深增大,过流能力增加。2)局部水流流态明显改善,水流趋于平顺,航道侧横流减至0.25 m s以下。3)4.5 m水深航道宽度在300 m以上,达到了预期整治目标,证明方案合理、整治效果符合预期。

When the river channel recovers to its natural state during the falling stage and flood period of the Three Gorges Reservoir,the reef hinders navigation in Wutailiang and restricts the development of the waterway.Therefore,reef removal is urgently needed.According to requirements for short-term waterway construction and long-term capacity expansion,a one-time reef removal scheme was drawn up.Numerical simulation methods were used to predict and analyze the implementation effect.The results are as follows:1)After the implementation of the project,the water depth and the flow capacity in the reef removal area increase.2)The flow regime of the local water area is significantly improved and the flow tends to be smooth.The transverse flow of the channel is reduced to less than 0.25 m s.3)The water channel with a depth of 4.5 m is above 300 m wide,which has achieved the expected regulation goal.It proves that the scheme is reasonable and meets expectations.