| 三峡水库蓄水后下荆江急弯河道凸冲凹淤成因 |
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| 引用本文： | 朱玲玲,许全喜,熊明. 三峡水库蓄水后下荆江急弯河道凸冲凹淤成因[J]. 水科学进展, 2017, 28(2): 193-202. DOI: 10.14042/j.cnki.32.1309.2017.02.004 |
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| 作者姓名： | 朱玲玲 许全喜 熊明 |
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| 作者单位： | 长江水利委员会水文局, 湖北 武汉 430010 |
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| 基金项目： | 水利部公益性行业科研专项经费资助项目（201401021）；国家自然科学基金资助项目（51579186） |
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| 摘 要： | 三峡水库蓄水后沙量骤减使得荆江河段河床剧烈冲刷调整，下荆江急弯段“凸冲凹淤”，部分弯道凹岸侧淤积形成水下潜洲。这种不同于弯曲河道一般性演变规律的异常现象势必给下荆江的行洪、航运及江湖关系变化等带来新的影响，其内在成因急需揭示。基于原型观测资料分析，通过研究滩槽冲淤量及分布、滩体及河道形态特征等，全面揭示了近期下荆江急弯段“凸冲凹淤”的演变特征及河道形态响应。结果表明，流量年内过程重分配、来沙量及组成突变是下荆江急弯段“凸冲凹淤”的决定性因素。
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| 关 键 词： | 急弯段 凸冲凹淤 中水历时 三峡水库 |
| 收稿时间： | 2016-03-29 |
Fluvial processes of meandering channels in the Lower Jingjiang River reach after the impoundment of Three Gorges Reservior |
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| ZHU Lingling,XU Quanxi,XIONG Ming. Fluvial processes of meandering channels in the Lower Jingjiang River reach after the impoundment of Three Gorges Reservior[J]. Advances in Water Science, 2017, 28(2): 193-202. DOI: 10.14042/j.cnki.32.1309.2017.02.004 |
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| Authors: | ZHU Lingling XU Quanxi XIONG Ming |
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| Affiliation: | Bureau of Hydrology, Changjiang Water Resources Commission, Wuhan 430010, China |
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| Abstract: | The sediment discharge has been reduced sharply since the operation of Three Gorges Project in 2003, leading to the severe erosion of Lower Jingjiang Reach (LJR), a representative meandering channel located in the middle of Yangtze River. Some sharp bends in LJR are unusually undergoing convex bank erosion and concave bank deposition resulting in submerged shoal, which are contrary to the basic fundamentals of curved riverbed evolution. These abnormal riverbed deformations induce changes in flood control, waterway condition and the relationship between Yangtze River and Dongting Lake, and indeed the corresponding mechanism needs to be investigated. In the paper, based on a number of field data, the characteristics of riverbed evolution and channel morphology adjustments are fully demonstrated by quantitative statistics of erosion-deposition distribution and channel morphology for selected curved reaches. The results indicate that the annual redistribution of flow, the reduction of sediment discharge and mutation of sediment gradation are the dominant causes. |
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| Keywords: | meandering channel convex bank erosion & concave bank deposition intermediate flow duration the Three Gorges Reservoir |
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