泥沙研究2025，Vol.50Issue(4)：9-14,6.DOI:10.16239/j.cnki.0468-155x.2025.04.002
长江中游沙卵石河段枯水位降幅的溯源传递机理研究
Research on the upstream transmission mechanism of low-water level decline in the sandy peddle reach of the middle Yangtze River
摘要
Abstract
The declining of low-water levels in the sandy peddle reaches of the middle Yangtze River have long been a critical concern,as it not only directly impairs navigation capacity,but also relates to the normal operation of the Gezhouba ship lock system.Thier spatial patterns are analyzed based on hydrological data.The results show that since 2014,the low-water level at flow rate of 7 000 m3/s has maintained relative stability at the upstream reach of Zhicheng,the water surface gradient in the downstream of Zhicheng has continued to increase,the water level drops have increased of 2.5 m increase in the reach from Zhicheng to Dabujie,with a surface water level gradient of 1.4‱.It was also found that this hydraulic adjustment process is governed by the energy slope dynamics during low-flow stages;the initial energy dissipation gradient during water level recession physically manifests the river self-regulatory mechanism;the greater the energy dissipation gradient,the shorter the length of the river section required for the same attenuation amplitude to be transmitted upstream during the process of water level drop.Current hydraulic conditions demonstrate that the longitudinal energy dicipation gradient along the Zhicheng-Dabujie reach is geometrically compatible with its channel length,which creating an effective buffer that restricts upstream propagation of water level decline.It is implied that the low water level decline will gradually concentrate towards the lower and even the end of the study reach in the future.The upward impact range of the decline in water level at the exit section will be further shortened to the reach downstream of Zhijiang.关键词
枯水位/能量损失比降/水位控制/沙卵石河段/长江中游Key words
low-water level/energy dissipation gradient/water level control/sandy peddle reach/the middle Yangtze River分类
建筑与水利引用本文复制引用
李明,周成成,袁晶,余文钧,夏楷..长江中游沙卵石河段枯水位降幅的溯源传递机理研究[J].泥沙研究,2025,50(4):9-14,6.基金项目
国家自然科学基金长江水科学研究联合基金项目(U2340217) （U2340217）
交通运输部三峡后续工作科研项目"长江中游砂卵石河段航道尺度提升对策研究" （）
