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Hydrodynamic variability in the Southern Bight of the North Sea in response to typical atmospheric and tidal regimes. Benefit of using a high resolution model
Ocean Modelling ( IF 3.2 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.ocemod.2020.101682
Evgeny Ivanov , Arthur Capet , Alexander Barth , Eric J.M. Delhez , Karline Soetaert , Marilaure Grégoire

Abstract In this paper, the hydrodynamics of the Southern Bight of the North Sea (SBNS) and in particular, the Belgian Coastal Zone (BCZ) is investigated on daily to seasonal time scales using a high resolution hydrodynamical model. The Regional Ocean Modeling System (ROMS) is implemented over the SBNS with 5 km resolution and downscaled at 1 km resolution over the BCZ in a two-way nesting configuration run over a three years period (i.e. 2006–2008). The benefit of using a high resolution model over the BCZ is assessed through an extensive comparison of model results with data from satellite and in-situ fixed platforms as well as reference products available for the region. The validation exercise and the results analysis are conducted with a particular focus on hydrodynamic features that are expected to impact the sediment transport. We find that despite the validation procedure does not allow to clearly demonstrate better performance of the high resolution model compared to the coarse resolution model in terms of overtidal circulation, sea surface temperature (SST) and salinity (SSS), the high resolution model resolves additional details in the variability of residual circulation and Scheldt salinity plume dynamics. The analysis of the response of the simulated hydrodynamics to atmospheric regimes for neap and spring tide highlights the major role played by the wind direction on the averaged currents and plume extension. The strongest currents and minimum plume extension are obtained under southwestern winds and neap tide while when northeastern winds prevail, the plume extension is at its maximum and the circulation is the weakest. We show that while neap tides allow the establishment of streamlined circulation, the spring tides induce more turbulent circulation which can favor the retention of transported elements. This latter property could not be resolved with the 5 km resolution model.

中文翻译:

响应典型大气和潮汐状态的北海南湾的水动力变化。使用高分辨率模型的好处

摘要 在本文中,使用高分辨率流体动力学模型在每日到季节性时间尺度上研究了北海南湾 (SBNS),特别是比利时沿海地区 (BCZ) 的流体动力学。区域海洋建模系统 (ROMS) 在 SBNS 上以 5 公里的分辨率实施,并在 BCZ 上以 1 公里的分辨率缩小规模,采用双向嵌套配置,运行时间为三年(即 2006-2008 年)。通过将模型结果与来自卫星和原位固定平台的数据以及该地区可用的参考产品的数据进行广泛比较,评估了使用高分辨率模型对 BCZ 的好处。进行验证和结果分析时,特别关注预计会影响沉积物运输的水动力特征。我们发现,尽管在潮汐环流、海面温度 (SST) 和盐度 (SSS) 方面,验证程序无法清楚地证明高分辨率模型与粗分辨率模型相比具有更好的性能,但高分辨率模型解决了额外的问题。残余循环和斯海尔德盐度羽流动力学变化的详细信息。模拟流体动力学对小潮和大潮的大气状态响应的分析突出了风向对平均洋流和羽流延伸所起的主要作用。西南风和小潮下气流最强,羽流扩展最小,而东北风盛行时,羽流扩展最大,环流最弱。我们表明,虽然小潮允许建立流线型环流,但大潮会引起更多的湍流环流,这有利于保留运输元素。后一种特性无法用 5 公里分辨率模型解决。
更新日期:2020-10-01
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