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New validation method for hydrodynamic fjord models applied in the Hardangerfjord, Norway
Estuarine, Coastal and Shelf Science ( IF 2.8 ) Pub Date : 2020-09-29 , DOI: 10.1016/j.ecss.2020.107028
Stig B. Dalsøren , Jon Albretsen , Lars Asplin

We introduce a new intuitive evaluation method for comparison of fjord model results and current measurements. The approach is tested using high resolution model simulations and measurements in the Hardangerfjord, a large fjord system in Norway with huge aquaculture production. The method is easy to interpret, clearly distinguishes periods with good and poor model performance, and relate them to physical driving forces. This makes it possible to identify potential shortcomings in the models’ representation of physical processes.

The applied model mostly performs well in the Hardangerfjord. Good performance often coincides with strong local fjord forcing (i.e. strong winds in the fjord). In periods with poor model performance, internal waves induced by pressure perturbations on the coastal shelf tend to propagate erroneously into the fjord. Stratification biases in coastal waters, connected to the applied model boundary conditions, seems to be an important cause.

Demonstrated flexibility of time frame and performance criteria suggests applicability of the validation method for a wide set of geophysical variables in various physical environments.



中文翻译:

挪威哈当厄尔峡湾应用水动力峡湾模型的新验证方法

我们引入了一种新的直观评估方法,用于比较峡湾模型结果和当前测量结果。该方法已在挪威大型峡湾系统Hardangerfjord中使用高分辨率模型仿真和测量进行了测试,该系统拥有大量水产养殖产量。该方法易于解释,可以清楚地区分模型性能的优劣,并将其与物理驱动力相关联。这使得识别模型在物理过程中的潜在缺陷成为可能。

该应用模型在哈丹厄尔峡湾(Hardangerfjord)中表现良好。良好的表现通常与当地峡湾的强力(即峡湾的强风)相吻合。在模型性能较差的时期,沿海架子上的压力扰动引起的内波往往会错误地传播到峡湾。与应用模型边界条件有关的沿海水域的分层偏差似乎是一个重要原因。

时间表和性能标准的灵活性表明,该验证方法适用于各种物理环境中的多种地球物理变量。

更新日期:2020-10-04
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