三峡大坝运行后长江城陵矶-九江河段水位变化的特征和原因

IF 2.7 4区 环境科学与生态学 Q2 Environmental Science Hydrology Research Pub Date : 2024-05-22 DOI:10.2166/nh.2024.010
Guangyue Zhang, Guangming Tan, Wei Zhang, Yuanfang Chai, Jingwen Wang, Zhi Yin, Yong Hu
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引用次数: 0

摘要

大坝下游的水位调节对河流水系和洪水控制有重大影响。然而,由于持续的强烈冲刷,我们对长江城陵矶-九江河段水位变化特征及其成因的定量认识仍然有限。在此,我们通过 Mann-Kendall 方法分析了水位变化趋势,并利用 406 个断面剖面以及 1991 年至 2022 年的下泄流量和水位数据分析了地貌变化和河流阻力。结果表明,三峡大坝运行后,城陵矶-汉口河段和汉口-九江河段的临界换算下泄流量(CCD)分别约为 35,000 m3/s 和 30,000 m3/s。当下泄流量低于 CCD 时,水位总体呈下降趋势,这主要是由于河流侵蚀所致。当泄洪量高于 CCD 时,水位呈不明显的上升趋势,主要是由于河流阻力增加(7-20%)。个别年份洪水位的明显上升是由于下游水位上升的影响。我们的研究结果进一步加深了人们对大坝运行下游地貌响应及其对水位影响的理解,对全球此类河流的洪水管理具有重要意义。
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Characteristics and causes of water level variations in the Chenglingji–Jiujiang reach of the Yangtze River following the operation of the Three Gorges Dam
Water level adjustment downstream of dams significantly impacts river regimes and flood control. However, due to constant strong scouring, our quantitative understanding of the characteristics of water level variations and their causes in the Chenglingji–Jiujiang Reach of the Yangtze River remains limited. Here, we analyzed the water level change trend via the Mann–Kendall method and analyzed geomorphic change and river resistance using 406 cross-sectional profiles as well as data on discharge and water levels from 1991 to 2022. Results showed that the critical conversion discharges (CCD) in the Chenglingji-Hankou Reach and the Hankou-Jiujiang Reach were approximately 35,000 and 30,000 m3/s, respectively, after the operation of the Three Gorges Dam. The water level exhibited an overall decline mainly due to river erosion when the discharge was lower than the CCD. The water level exhibited a nonsignificant upward trend mainly due to increased river resistance (7–20%) when the discharge was higher than the CCD. The obvious increase in the floodwater level in individual years was caused by the effect of downstream water level increase. Our findings further the understanding of downstream geomorphic response to dam operation and their impacts on water levels and have important implications for flood management in such rivers worldwide.
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来源期刊
Hydrology Research
Hydrology Research Environmental Science-Water Science and Technology
CiteScore
5.30
自引率
7.40%
发文量
70
审稿时长
17 weeks
期刊介绍: Hydrology Research provides international coverage on all aspects of hydrology in its widest sense, and welcomes the submission of papers from across the subject. While emphasis is placed on studies of the hydrological cycle, the Journal also covers the physics and chemistry of water. Hydrology Research is intended to be a link between basic hydrological research and the practical application of scientific results within the broad field of water management.
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