| 工程影响下长江口涨潮槽演变特征研究--以北港六滧涨潮槽为例 |
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| 引用本文： | 石天,程和琴,华凯,滕立志,唐明,姜泽宇,颜阁,姜月华,周权平.工程影响下长江口涨潮槽演变特征研究--以北港六滧涨潮槽为例[J].海洋通报,2020,39(1):134-142. |
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| 作者姓名： | 石天 程和琴 华凯 滕立志 唐明 姜泽宇 颜阁 姜月华 周权平 |
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| 作者单位： | 华东师范大学河口海岸学国家重点实验室,上海 200241;华东师范大学河口海岸学国家重点实验室,上海 200241;崇明生态研究院,上海 202150;中国地质调查局南京地质调查中心,江苏 南京 210016 |
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| 基金项目： | 国家自然科学基金委 （NSFC） 与荷兰科学研究组织 （NOW）、英国研究理事会 （RCUK） 合作研究项目 （51761135023）；长江经济带地质资源环境综合评价项目 （DD20190260） |
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| 摘 要： | 崇明岛南岸发育有六滧涨潮槽,研究其演变过程对于崇明世界级生态岛港口建设、通航安全和岸滩稳定具有重要意义。为此,在长江口北港中上段2000、2004、2008、2012和2018年海图水深数据的基础上,分别于2018年7月利用SeaBat 7125、2019年7月利用M80无人艇搭载的SeaBat T50-P多波束测深系统以及ADCP对六滧涨潮槽开展了水下地形和流速的测量工作,分析工程影响下六滧涨潮槽的演变特征。结果表明:六滧涨潮槽淤浅,外侧沙脊冲刷剧烈,槽内落潮优势明显。其原因为流域来沙减少、以青草沙水库为主体工程的南北港分流口整治及长江大桥的修建导致了北港中上段主槽冲刷、主流北移。同时,六滧涨潮槽局部水动力条件增强,槽内的丁坝坝头局部冲刷加剧,并且奚家港东侧岸滩出现侵蚀,需引起重视。
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| 关 键 词： | 长江口 工程 六滧涨潮槽 演变特征 深泓 岸滩侵蚀 |
| 收稿时间： | 2019/10/30 0:00:00 |
| 修稿时间： | 2019/12/23 0:00:00 |
Recent evolution of flood channels in the Yangtze Estuary affected by fluvial and estuarine engineering: an instance of the Liuyao flood channel |
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| SHI Tian,CHENG He-qin,HUA Kai,TENG Li-zhi,TANG Ming,JIANG Ze-yu,YAN Ge,JIANG Yue-Hua and ZHOU Quan-ping.Recent evolution of flood channels in the Yangtze Estuary affected by fluvial and estuarine engineering: an instance of the Liuyao flood channel[J].Marine Science Bulletin,2020,39(1):134-142. |
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| Authors: | SHI Tian CHENG He-qin HUA Kai TENG Li-zhi TANG Ming JIANG Ze-yu YAN Ge JIANG Yue-Hua and ZHOU Quan-ping |
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| Institution: | State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China,State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China;Institute of Eco-Chongming (IEC), Shanghai 202150, China,State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China,State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China,State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China,State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China,State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China,China Nanjing Center, China Geological Survey, Nanjing 210016, China and China Nanjing Center, China Geological Survey, Nanjing 210016, China |
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| Abstract: | The Liuyao flood channel near the south coast of Chongming Island,Yangtze Estuary plays an important role of the maintenance and construction of port,waterway and stability of embankment,spur dike,etc. Its evolution trend is discussed in the present paper. Data analysis have been made of water depth digitzed from the nautical map in 2000,2004,2008,2012 and 2018,riverbed morphology measured by SeaBat 7125 multi -beam system in July 2018 and SeaBat T50-P carried on the M80 USV in July 2019,and tidal flow synchronously acquired by ADCP in July 2018. Results show that the Liuyao Sand which is the lateral boundary of the Liuyao flood channel was sharply eroded mean while the Liuyao flood channel was deposited and shallower. This means that the flood channel has become obvious ebb dominated. This
evolution tendency of flood channel is attributed to the Three Gorges Dam impoundment,constructions of the Qingcaosha reservoir. The former led the fluvial sediment supply decline and erosion of main channels including the North Channel. The latter cut almost a third of channel width of upper and middle North Channel to cause the northward migration of thalweg,scour enhancement of groyne head and quite strong erosion of tidal flat between Baozhen and Xijiagang. Consequently,the security of coastal defense should be concerned with the regulation in the near future. |
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| Keywords: | Yangtze Estuary engineering Liuyao flood channel evolution trend thalweg coastal erosion |
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