三峡工程运用后荆江段崩岸过程及特点

夏军强; 林芬芬; 周美蓉; 邓珊珊; 彭玉明

doi:10.14042/j.cnki.32.1309.2017.04.008

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三峡工程运用后荆江段崩岸过程及特点

夏军强, 林芬芬, 周美蓉, 邓珊珊, 彭玉明

文章导航 > 水科学进展 > 2017 > 28(4): 543-552

夏军强, 林芬芬, 周美蓉, 邓珊珊, 彭玉明. 三峡工程运用后荆江段崩岸过程及特点[J]. 水科学进展, 2017, 28(4): 543-552. doi: 10.14042/j.cnki.32.1309.2017.04.008

引用本文:

夏军强, 林芬芬, 周美蓉, 邓珊珊, 彭玉明. 三峡工程运用后荆江段崩岸过程及特点[J]. 水科学进展, 2017, 28(4): 543-552. doi: 10.14042/j.cnki.32.1309.2017.04.008

XIA Junqiang, LIN Fenfen, ZHOU Meirong, DENG Shanshan, PENG Yuming. Bank retreat processes and characteristics in the Jingjiang Reach after the Three Gorges Project operation[J]. Advances in Water Science, 2017, 28(4): 543-552. doi: 10.14042/j.cnki.32.1309.2017.04.008

Citation:

XIA Junqiang, LIN Fenfen, ZHOU Meirong, DENG Shanshan, PENG Yuming. Bank retreat processes and characteristics in the Jingjiang Reach after the Three Gorges Project operation[J]. Advances in Water Science, 2017, 28(4): 543-552. doi: 10.14042/j.cnki.32.1309.2017.04.008

三峡工程运用后荆江段崩岸过程及特点

doi: 10.14042/j.cnki.32.1309.2017.04.008

1.
武汉大学水资源与水电工程科学国家重点实验室, 湖北武汉 430072;
2.
长江水利委员会水文局荆江水文水资源勘测局, 湖北荆州 434002

基金项目: 国家重点研发计划资助项目（2016YFC0402303）；国家自然科学基金资助项目（51579186）

详细信息

作者简介:
夏军强(1974-),男,浙江绍兴人,教授,博士,主要从事河流动力学研究。E-mail:xiajq@whu.edu.cn

中图分类号: TV147

Bank retreat processes and characteristics in the Jingjiang Reach after the Three Gorges Project operation

1.
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;
2.
Jingjiang Bureau of Hydrology and Water Resources Survey, Changjiang Water Resources Commission, Jingzhou 434020, China

Funds: The study is financially supported by the National Key R&D Program of China (No.2016YFC0402303) and the National Natural Science Foundation of China (No.51579186).

摘要: 为研究近期荆江段崩岸过程及特点，利用实测水下地形图及固定断面资料，分析了三峡工程运用前后该河段平面及断面的形态变化过程。平面形态对比结果表明：2002-2013年荆江段多年平均崩退速率约为15.0 m/a，崩岸总长达42.3 km，左岸占59.2%；下荆江岸线崩长约为上荆江的2.2倍，且石首、调关及荆江门等河湾凸岸一侧受低含沙水流长期冲刷不断崩退，其岸线崩长约占下荆江崩岸总长的35.5%。断面形态对比结果显示：2002-2015年荆江段约有21%断面存在明显的崩岸现象，且近74%的崩岸断面位于下荆江。故近期荆江段崩岸分布规律主要表现为左岸多于右岸，下荆江多于上荆江，且下荆江部分河湾凸岸崩退显著。定量分析了河岸土体组成与分布、来水来沙条件等因素对崩岸过程的影响，发现来水来沙条件的影响占主导地位。建立了上、下荆江典型断面平滩河宽与前期水沙条件之间的经验关系，除工程守护良好的断面外，相关系数均高于0.85，提出的经验公式可较好反映水沙条件变化对平滩河宽调整的影响。
- 崩岸特点 /
- 崩岸机理 /
- 河岸稳定性 /
- 深泓摆动 /
- 荆江段 /
- 三峡工程
Abstract: The Jingjiang Reach is undergoing considerable channel degradation, and significant bank retreat processes have occurred at local sites due to the operation of the Three Gorges Project (TGP). By investigating the adjustments in planform and cross-sectional geometries based on the measured topographic and hydrological data after the TGP operation, it is discovered that the process of bankline migration was remarkable in the Jingjiang Reach, with the average annual bank-erosion rate of 15.0 m/a and the cumulative bank-erosion length of 42.3 km; 59.2% of the bank-erosion regions were located at the left bank, and 68.7% of them were located in the Lower Jingjiang Reach (LJR); and severe bank retreat processes also occurred at convex banks, with 35.5% of the bank-erosion regions in the LJR. In addition, the variation in cross-sectional profiles indicates that 21% of all the cross-sections underwent obvious bank retreat processes, of which 74% occurred in the LJR. In summary, the bank-erosion regions were mainly located at the left bank and the bank retreat intensity was much higher in the LJR. Various factors influencing bank retreat in the Jingjiang Reach have been presented, and the results indicate that the incoming flow-sediment regime is a dominant control factor. Finally, empirical relationships were developed between the section-scale bankfull widths at typical sections with severe bank retreat and the previous five-year average fluvial erosion intensity during flood seasons, with the correlation coefficients of being higher than 0.85. Therefore, the proposed empirical relations can better consider the effect of the altered flow and sediment regime on the variation in bankfull widths at typical sections.
- bank retreat characteristics /
- bank erosion mechanism /
- riverbank stability /
- thalweg migration /
- Jingjiang Reach /
- Three Gorges Project

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三峡工程运用后荆江段崩岸过程及特点

doi: 10.14042/j.cnki.32.1309.2017.04.008

1. 武汉大学水资源与水电工程科学国家重点实验室, 湖北武汉 430072;

2. 长江水利委员会水文局荆江水文水资源勘测局, 湖北荆州 434002

基金项目: 国家重点研发计划资助项目（2016YFC0402303）；国家自然科学基金资助项目（51579186）

作者简介:
夏军强(1974-),男,浙江绍兴人,教授,博士,主要从事河流动力学研究。E-mail:xiajq@whu.edu.cn

收稿日期: 2016-11-30
刊出日期: 2017-07-25

中图分类号: TV147

关键词:

荆江段 /

摘要: 为研究近期荆江段崩岸过程及特点，利用实测水下地形图及固定断面资料，分析了三峡工程运用前后该河段平面及断面的形态变化过程。平面形态对比结果表明：2002-2013年荆江段多年平均崩退速率约为15.0 m/a，崩岸总长达42.3 km，左岸占59.2%；下荆江岸线崩长约为上荆江的2.2倍，且石首、调关及荆江门等河湾凸岸一侧受低含沙水流长期冲刷不断崩退，其岸线崩长约占下荆江崩岸总长的35.5%。断面形态对比结果显示：2002-2015年荆江段约有21%断面存在明显的崩岸现象，且近74%的崩岸断面位于下荆江。故近期荆江段崩岸分布规律主要表现为左岸多于右岸，下荆江多于上荆江，且下荆江部分河湾凸岸崩退显著。定量分析了河岸土体组成与分布、来水来沙条件等因素对崩岸过程的影响，发现来水来沙条件的影响占主导地位。建立了上、下荆江典型断面平滩河宽与前期水沙条件之间的经验关系，除工程守护良好的断面外，相关系数均高于0.85，提出的经验公式可较好反映水沙条件变化对平滩河宽调整的影响。

English Abstract

Bank retreat processes and characteristics in the Jingjiang Reach after the Three Gorges Project operation

1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;

2. Jingjiang Bureau of Hydrology and Water Resources Survey, Changjiang Water Resources Commission, Jingzhou 434020, China

Funds: The study is financially supported by the National Key R&D Program of China (No.2016YFC0402303) and the National Natural Science Foundation of China (No.51579186).

Received Date: 2016-11-30
Publish Date: 2017-07-25

Keywords:

Abstract: The Jingjiang Reach is undergoing considerable channel degradation, and significant bank retreat processes have occurred at local sites due to the operation of the Three Gorges Project (TGP). By investigating the adjustments in planform and cross-sectional geometries based on the measured topographic and hydrological data after the TGP operation, it is discovered that the process of bankline migration was remarkable in the Jingjiang Reach, with the average annual bank-erosion rate of 15.0 m/a and the cumulative bank-erosion length of 42.3 km; 59.2% of the bank-erosion regions were located at the left bank, and 68.7% of them were located in the Lower Jingjiang Reach (LJR); and severe bank retreat processes also occurred at convex banks, with 35.5% of the bank-erosion regions in the LJR. In addition, the variation in cross-sectional profiles indicates that 21% of all the cross-sections underwent obvious bank retreat processes, of which 74% occurred in the LJR. In summary, the bank-erosion regions were mainly located at the left bank and the bank retreat intensity was much higher in the LJR. Various factors influencing bank retreat in the Jingjiang Reach have been presented, and the results indicate that the incoming flow-sediment regime is a dominant control factor. Finally, empirical relationships were developed between the section-scale bankfull widths at typical sections with severe bank retreat and the previous five-year average fluvial erosion intensity during flood seasons, with the correlation coefficients of being higher than 0.85. Therefore, the proposed empirical relations can better consider the effect of the altered flow and sediment regime on the variation in bankfull widths at typical sections.

夏军强, 林芬芬, 周美蓉, 邓珊珊, 彭玉明. 三峡工程运用后荆江段崩岸过程及特点[J]. 水科学进展, 2017, 28(4): 543-552. doi: 10.14042/j.cnki.32.1309.2017.04.008

引用本文:

夏军强, 林芬芬, 周美蓉, 邓珊珊, 彭玉明. 三峡工程运用后荆江段崩岸过程及特点[J]. 水科学进展, 2017, 28(4): 543-552. doi: 10.14042/j.cnki.32.1309.2017.04.008

Citation:

XIA Junqiang, LIN Fenfen, ZHOU Meirong, DENG Shanshan, PENG Yuming. Bank retreat processes and characteristics in the Jingjiang Reach after the Three Gorges Project operation[J]. Advances in Water Science, 2017, 28(4): 543-552. doi: 10.14042/j.cnki.32.1309.2017.04.008

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三峡工程运用后荆江段崩岸过程及特点

doi: 10.14042/j.cnki.32.1309.2017.04.008

作者简介: 夏军强(1974-),男,浙江绍兴人,教授,博士,主要从事河流动力学研究。E-mail:xiajq@whu.edu.cn

Bank retreat processes and characteristics in the Jingjiang Reach after the Three Gorges Project operation

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出版历程

三峡工程运用后荆江段崩岸过程及特点

doi: 10.14042/j.cnki.32.1309.2017.04.008

1. 武汉大学水资源与水电工程科学国家重点实验室, 湖北 武汉 430072; 2. 长江水利委员会水文局荆江水文水资源勘测局, 湖北 荆州 434002

作者简介: 夏军强(1974-),男,浙江绍兴人,教授,博士,主要从事河流动力学研究。E-mail:xiajq@whu.edu.cn

English Abstract

Bank retreat processes and characteristics in the Jingjiang Reach after the Three Gorges Project operation

1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; 2. Jingjiang Bureau of Hydrology and Water Resources Survey, Changjiang Water Resources Commission, Jingzhou 434020, China

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目录

作者简介:
夏军强(1974-),男,浙江绍兴人,教授,博士,主要从事河流动力学研究。E-mail:xiajq@whu.edu.cn

1. 武汉大学水资源与水电工程科学国家重点实验室, 湖北武汉 430072;

2. 长江水利委员会水文局荆江水文水资源勘测局, 湖北荆州 434002

作者简介:
夏军强(1974-),男,浙江绍兴人,教授,博士,主要从事河流动力学研究。E-mail:xiajq@whu.edu.cn

1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;

2. Jingjiang Bureau of Hydrology and Water Resources Survey, Changjiang Water Resources Commission, Jingzhou 434020, China