长江下游武汉—安庆河段中洪水期航道尺度潜力研究

Potential of channel scale about medium flood period from Wuhan to Anqing section of lower reaches of the Yangtze River

现有长江航道尺度研究聚焦于枯水条件下航道最小维护尺度,对中洪水期航道尺度缺乏相应的研究。本文基于三峡175 m蓄水运用以来水位及地形变化特点,提出以三峡175 m试验性蓄水以来至2021年底当月最低水位作为可利用水位,叠加近年来中洪水期最不利地形的核查方法,筛查出重点水道并结合实测尺度,探讨航道尺度提升潜力。结果表明:核查方法对中洪水期航道尺度潜力分析的适应性良好,长江下游武汉—安庆河段在枯水维护的基础上,具备在中洪水期利用自然水位提升航道维护尺度的潜力。

The existing research on the scale of the Yangtze River waterway focuses on the minimum maintenance scale of the waterway under low water conditions,and lacks corresponding research on the scale of the waterway during medium flood periods.This article is based on the characteristics of water level and terrain changes since the use of the 175 m water storage in the Three Gorges Dam.It proposes to use the lowest water level from the 175 m experimental water storage in the Three Gorges Dam to the end of 2021 as a verification method for overlaying the available water level with the most unfavorable terrain during the recent mid flood period.Key waterways are screened and combined with actual measurement scales to explore the potential for channel scale improvement.The results indicate that the verification method has good adaptability to the potential analysis of channel scale during medium flood periods.On the basis of low water maintenance,the Wuhan to Anqing section of the lower reaches of the Yangtze River has the potential to use natural water levels to enhance channel maintenance scale during medium flood periods.