摘要
广西钦州湾是中国南方重要河口型海湾,近期在高强度人类活动影响下,钦州湾水动力过程发生变化,对港口航运和岸线稳定性产生影响。文章基于1985年和2020年两期岸线和水下地形数据,采用水动力–沉积动力耦合的数值模型系统模拟了近35年工程建设和海岸围垦对钦州湾水动力和未来水下地形演变的影响。结果表明,围填海工程略微增加了龙门水道和外湾地区的潮汐场流速,有利于优化流路的空间分布格局;同时,围垦改变了潮汐不对称性分布,变化较大区域发生在茅尾海北部、龙门水道、外湾中部和三墩公路周边,对滩潮格局发育和局部冲淤态势产生影响;钦州湾中部龙门水道侵蚀略微增加,但变化范围更为集中,外湾地区变化幅度略微减少,变化趋势向东西两侧水道集中。总体而言,围垦工程导致钦州湾水下地形变化趋于稳定。钦州湾围垦工程对动力地貌稳定性产生重要影响,对维持港口航运和海岸带经济可持续性发展具有积极意义。
The Qinzhou Bay in Guangxi province is an important estuarine bay in south China.With recent intensive engineering construction and coastal reclamations,the topography evolution of the Qinzhou Bay is changed,which may influence the port shipping and shoreline stability.Based on two sets of coastline and underwater topographic data,we developed a coupled hydrodynamic-sedimentary dynamic numerical modelling system to simulate the impact of human activities on the dynamics of underwater topography evolution of the Qinzhou Bay in the past 35 years.Our results show that the reclamations optimize the spatial distribution of the flow field by slightly increasing the tidal flow velocity in the Longmen waterway and the outer bay;meanwhile,the reclamations changed the tidal asymmetry distribution,which may affect the development trend of the channel-beach pattern and the local erosion and deposition,mainly in the area of the northern Maowei Sea,the Longmen waterway,the middle of the outer bay,and around the Sandun Highway;moreover,the coastal reclamations had overall weakened the underwater geomorphology change of the Qinzhou Bay,and slightly increased the changes in the central Longmen waterway,but the spatial distribution of the change is more concentrated.The magnitude of change in the outer bay area decreased slightly,the trend of change was concentrated in the eastern and western waterway,while the change in the central waterway tended to be stable.Overall,maintaining a stable topography of the Qinzhou Bay is of great importance for the sustainable development of port shipping and coastal zone economy in the future.
作者
张敏
吴航星
陆逸彬
陆迪文
米婕
朱冬琳
陈波
ZHANG Min;WU Hangxing;LU Yibin;LU Diwen;MI Jie;ZHU Donglin;CHEN Bo(Guangxi Key Laboratory of Marine Environmental Science,Guangxi Beibu Gulf Marine Research Center,Guangxi Academy of Sciences,Nanning 530007,China;School of Environmental and Geographical Sciences,Shanghai Normal University,Shanghai 200234,China)
出处
《热带海洋学报》
CAS
CSCD
北大核心
2023年第2期124-131,共8页
Journal of Tropical Oceanography
基金
广西近海海洋环境科学重点实验室开放基金项目(GXKLHY21-02)
国家自然科学基金项目(42171282,41930537)
上海市浦江人才计划项目(21PJC096)。
关键词
沉积动力
数值模拟
岸线围垦
茅尾海
sedimentary dynamics
numerical simulation
coastal reclamation
Maowei Sea
