Scottish Association for Marine Science, Scottish Marine Institute, Oban, Argyll PA37 1QA, United Kingdom.
Harmful Algae. 2016 Mar;53:102-117. doi: 10.1016/j.hal.2015.11.012. Epub 2016 May 3.
Fjordic coastlines provide sheltered locations for finfish and shellfish aquaculture, and are often subject to harmful algal blooms (HABs) some of which develop offshore and are then advected to impact nearshore aquaculture. Numerical models are a potentially important tool for providing early warning of such HAB events. However, the complex topography of fjordic shelf regions is a significant challenge to modelling. This is frequently compounded by complex bathymetry and local weather patterns. Existing structured grid models do not provide the resolution needed to represent these coastlines in their wider shelf context. In a number of locations advectively transported blooms of the ichthyotoxic dinoflagellate Karenia mikimotoi are of particular concern for the finfish industry. Here were present a novel hydrodynamic model of the coastal waters to the west of Scotland that is based on unstructured finite volume methodology, providing a sufficiently high resolution hydrodynamical structure to realistically simulate the transport of particles (such as K. mikimotoi cells) within nearshore waters where aquaculture sites are sited. Model-observation comparisons reveal close correspondence of tidal elevations for major semidiurnal and diurnal tidal constituents. The thermohaline structure of the model and its current fields are also in good agreement with a number of existing observational datasets. Simulations of the transport of Lagrangian drifting buoys, along with the incorporation of an individual-based biological model, based on a bloom of K. mikimotoi, demonstrate that unstructured grid models have considerable potential for HAB prediction in Scotland and in complex topographical regions elsewhere.
峡湾海岸线为鱼类和贝类水产养殖提供了遮蔽的场所，并且经常受到有害藻类大量繁殖（HABs）的影响，其中一些在近海形成，然后被输送到近岸水产养殖区。数值模型是提供此类 HAB 事件早期预警的潜在重要工具。然而，峡湾陆架区的复杂地形是建模的重大挑战。这常常因复杂的水深和当地天气模式而加剧。现有的结构化网格模型无法提供在更广泛的陆架背景下表示这些海岸线所需的分辨率。在一些地方，鱼类毒性甲藻米氏凯伦藻的输送性大量繁殖对鱼类养殖业特别关注。在这里，我们提出了一种基于非结构化有限体积方法的苏格兰西部沿海水域的新型水动力模型，该模型提供了足够高的水动力分辨率，可在水产养殖区所在的近岸水域中真实模拟颗粒（如 K. mikimotoi 细胞）的运输。模型-观测比较显示主要半日潮和全日潮潮汐成分的潮位非常吻合。模型的热盐结构及其当前场也与许多现有的观测数据集非常吻合。拉格朗日漂流浮标运输的模拟，以及基于米氏凯伦藻大量繁殖的基于个体的生物模型的纳入，表明非结构化网格模型在苏格兰和其他复杂地形地区具有很大的 HAB 预测潜力。
