| 摘要: |
| 2022年长江流域遭遇了汛期反枯的极端水文气象条件,导致长江中下游的水位降至有实测资料记录以来的同期最低。本文基于详细实测水沙资料,对2022年极端水文气象条件下长江中下游干流河道的冲淤变化特性进行深入分析。结果表明：1～6月份长江中下游各测站输沙量有增有减,总体上输沙量保持相对稳定。7～12月份各测站输沙量均出现了大幅度的下降。宜昌至九江河段通过输沙量法计算得知冲刷的泥沙总量为2391万t,其中湖口至江阴河段泥沙淤积量为4657万m3(湖口至大通冲刷量为1211万m3、大通至江阴淤积量为5868万m3),江阴以下河段冲刷量为6335万m3。上游来流减少和长江口潮位的影响是造成湖口至江阴河段淤积的主要原因。研究成果为进一步探索长江中下游河道冲淤变化规律,以及预测未来的冲淤趋势,提供了重要的基础和参考依据。 |
| 关键词: 2022年 长江中下游 河道冲淤 极端枯水 |
| DOI： |
| 分类号:TV697 |
| 基金项目:长江水科学研究联合(编号：U2240224,U2240206) ；洞庭湖水环境治理与生态修复湖南省重点实验室开发基金(2020DT002)；湖南省水利科技面上项目(XSKJ2021000-28) |
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| The impact of |
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XIAO Xiao1,2,3,2, WU Shi-qiang3
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1.Hydrology Bureau of Changjiang Water Resources Commission;2.China;3.Nanjing Hydraulic Research Institute
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| Abstract: |
| In 2022, the extreme hydrological conditions occurred in the Changjiang river basin. And the middle and lower reaches of Changjiang River experienced the lowest water level in the flood season. This paper analyzed the scouting and silting change characteristic of the main stream of middle and lower reaches of Changjiang in 2022. The result showed that sediment discharge increases and decreases at various to June, and the overall sediment discharge is same. From July to December, sediment discharge at various stations decreases significantly. The sediment discharge from Yichang to Jiujiang is 23.91million t, the sedimentation from Hukou to Jiangyin is 46.57 million m3 (from Hukou to Datong is 12.11 million m3, from Datong to Jiangyin is 58.68 million m3), and the sediment discharge below Jiangyin is 63.35 million m3. The decrease of upstream flow and the influence of tidal level at the Yangtze Estuary are the reasons for the sedimentation from Hukou to Jiangyin. The results provide a basis and reference for further study on the variation of sediment discharge and sedimentation in the middle and lower reaches of the Yangtze River and the prediction of future sediment discharge and sedimentation trend. |
| Key words: 2022 middle and lower reaches of Changjiang River river scouring and silting extreme drought |
