岸线变化对钦州湾水动力环境的影响

Effects of Shoreline Change on Hydrodynamic Environment in Qinzhou Bay

关键词:  钦州湾  岸线变化  水动力

Key words:  Qinzhou Bay  shoreline change  hydrodynamic environment

摘要:

[目的]分析岸线变化对钦州湾水动力环境的影响,为钦州湾海岸线开发、海洋环境保护提供科学依据。[方法]结合2004年及2012年海图、卫星影像资料等资料,采用数值模拟的方法对钦州湾2004年-2012年间岸线变化造成潮流、纳潮量、水交换能力的变化进行计算。[结果]岸线变化后,三墩公路顶端附近海域流速增大0.2 m/s,犀牛脚附近下降0.1 m/s,三墩公路两侧涨潮时潮流流向由东南向变为西南向和正北向;大、小潮期间,海域纳潮量分别下降-1.50×10⁸ m³和-0.29×10⁸ m³,下降幅度分别约为总量的10.3%和10.9%;水体半交换时间由27 d延长至28 d。[结论]岸线变化对钦州湾水动力环境有一定的影响,岸线开发利用应充分考虑岸线变化对海洋环境的影响。

Abstract:

[Objective] To provide the scientific basis for shoreline development and marine environmental protection, the effects of shoreline change on hydrodynamic environment in Qinzhou Bay were analyzed.[Methods] Based on charts and satellite images during the year of 2004 and 2012, the change of tidal current, tidal prism, and water exchange ability of Qinzhou Bay were calculated by numerical simulation method.[Results] After the change of the shoreline, the flow velocity of the waters near the top of the Sandun highway was increased by 0.2 m/s, and decreased by 0.1 m/s near the Xiniujiao. The current direction changed from southeast to southwest and north near Sandun in flood tide. The tidal prism of Qinzhou Bay decreased about -1.50×10⁸m³ in spring tidal and about -0.29×10⁸m³ in neap tidal, the decrease amplitude accounted for about 10.3% and 10.9% of total tidal prism respectively. The half exchange time of water was extended from 27 d to 28 d.[Conclusion] The shoreline change has a certain effect on hydrodynamic environment in Qinzhou Bay. The coastland development and utilization should fully consider the impact of shoreline changes on marine environment.