| 摘要: |
| 根据海图资料和卫星影像，确定了钦州湾2004年与2019年两个历史时期的岸线与水深。基于无结构网格有限体积海洋模型建立高精度的水动力模型，分析了近15年来围填海工程的累积效应对钦州湾水动力环境的影响。结果表明：地形与岸线的改变使得钦州湾外湾潮汐振幅减小、茅尾海内潮汐振幅增加；潮流场改变明显，外湾中部流速普遍增加，围填区域潮流减弱明显，但潮流性质未改变，依然为落潮占优；钦州湾纳潮量有所减小，主要发生在外湾区域；而余流减弱，并且出现涡旋，这不利于水体的向外扩散。通过染色实验发现，钦州湾水体半交换周期在有无径流的情况下都明显增长，且在围填海区域水交换能力显著下降。 |
| 关键词: 钦州湾 围填海 累积效应 水动力 水交换 |
| DOI：10.11693/hyhz20201200342 |
| 分类号:P733.2 |
| 基金项目:广西重点研发计划，桂科AB1850023号；中央高校基本科研业务费，202042008号。 |
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| THE CUMMULATIVE EFFECT OF LAND RECLAMATION ON HYDRODYNAMICS IN QINZHOU BAY |
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LYU He1,2,3, ZHANG Shao-Feng4, SONG De-Hai1,3, BAO Xian-Wen1,2,3
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1.Key Laboratory of Physical Oceanography, Ministry of Education, Ocean University of China, Qingdao 266100, China;2.College of Oceanic and Atmosphere Sciences, Ocean University of China, Qingdao 266100, China;3.Laboratory for Ocean Dynamics and Climate, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China;4.Fourth Institute of Oceanography, Ministry of Natural Resources, Beihai 536000, China
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| Abstract: |
| Using historical marine charts and satellite images, it has been confirmed that the evolution of coastline and bathymetry of the Qinzhou Bay, Guangxi, China from 2004 to 2019. Then, high-resolution, three-dimensional numerical models were established based on the unstructured-grid, Finite Volume Community Ocean Model to study the cumulative effect of land reclamation on hydrodynamics in Qinzhou Bay during the past 15 years. Results show that the tidal amplitude has been decreased in the outer bay, but increased in the inner bay. The tidal current in the middle channel has been generally increased, but largely weakened near the reclamation area. However, it is still ebb-dominant regime in most of the study area, except in the shoal water. The tidal prism in Qinzhou Bay has been reduced, especially in the outer bay. Also, the residual current has been reduced and some eddies formed, which is disadvantage for water exchange. In addition, tracer-tracking experiments were performed, and the result shows that the half-life time of exchange has been increased significantly from 2004 to 2019 whether the river runoff is considered or not. Overall, the water exchange capacity of the bay has been deteriorated by land reclamation and other human activities in the last 15 years. |
| Key words: Qinzhou Bay cumulative effect land reclamation hydrodynamics bay-shelf exchange |
