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首页> 外文期刊>Journal of Hydroinformatics >Modelling flows in shallow (fluvial) lakes with prevailing circulations in the horizontal plane: limits of 2D compared to 3D models
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Modelling flows in shallow (fluvial) lakes with prevailing circulations in the horizontal plane: limits of 2D compared to 3D models

机译：建模浅水（河流）湖泊中的水流，并在水平面中占主导地位的循环：与3D模型相比，2D的极限

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摘要

The numerical modelling of circulations in shallow lakes is a relevant tool for all environmental applications in which flow advection processes are of interest, e.g. for studies on nutrients, microorganisms, pollutants and sediment dynamics. While three-dimensional (3D) models are needed to properly describe the flow fields of basins with the main circulations in the vertical plane, two-dimensional (2D) models are commonly deemed to yield adequate results for lakes with prevailing horizontal circulations. However, the depth-averaged approximation is more limiting for wind-driven flows than for gravity-driven ones, such as rivers, as the driving force is a surface rather than a volume one, distributed along the depth through turbulence. In this work, the effects of such inaccuracy on the reproduction of circulation layouts are evaluated through compared simulations between a 2D Shallow Water solver and a 3D Reynolds-Averaged Navier-Stokes one. The models are first applied to a simple enclosed elliptical test basin and then to the real case of the Superior Lake of Mantua, a shallow fluvial lake in Northern Italy, thereby also investigating the influences of the interaction of wind with a riverine current and of a complex bathymetry on the compared results.
机译：浅湖中环流的数值模拟是所有对流平流过程都感兴趣的环境应用的重要工具。用于营养，微生物，污染物和沉积物动力学的研究。虽然需要使用三维模型（3D）来正确描述主旋流在垂直平面上的流域，但通常认为二维（2D）模型对于具有主流旋流的湖泊会产生足够的结果。但是，对于风流而言，深度平均逼近比对重力流（如河流）的限制更大，因为驱动力是一种表面，而不是体积（通过湍流沿深度分布）。在这项工作中，通过比较2D浅水求解器与3D雷诺平均Navier-Stokes模拟之间的比较，评估了这种不精确性对循环布局的影响。这些模型首先应用于简单的封闭椭圆形测试盆，然后应用于意大利北部曼图亚上级湖的真实案例，曼图亚上级湖是浅流河湖，从而也研究了风与河水相互作用和风向相互作用的影响。复测深仪的比较结果。

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