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Modeling the tidal and sub-tidal hydrodynamics in a shallow, micro-tidal estuary

机译：在浅，微潮河口中模拟潮汐和潮汐水动力

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The three-dimensional hydrodynamics of Galveston Bay were simulated in two periods of several month duration. The physical setting of Galveston Bay is described by synthesis of long-term observations. Several processes in addition to tidal hydrodynamics and baroclinic circulation processes contribute substantially to the observed variability of currents, water level and salinity. The model was therefore forced with realistic water levels, river discharges, winds, coastal buoyancy currents (due to the Mississippi River plume) and surface heat fluxes. Quantitative metrics were used to evaluate model performance against observations and both spatial and temporal variability in tidal and sub-tidal hydrodynamics were generally well represented by the model. Three different unstructured meshes were tested, a triangular mesh that under-resolved the shipping channel, a triangular mesh that resolved it, and a mixed quadrilateral-triangular grid with approximately equivalent resolution. It is shown that salinity and sub-tidal velocity are better predicted when the important topographic features, such as the shipping channel, are resolved. It was necessary to increase the seabed drag roughness in the mixed quadrilateral-triangular grid simulation to attain similar performance to the equivalent triangular mesh. (C) 2015 Elsevier Ltd. All rights reserved.
机译：加尔维斯顿湾的三维水动力模拟了两个月的持续时间。加尔维斯顿湾的物理环境通过长期观测的综合描述。除了潮汐水动力和斜压环流过程外，还有几个过程对观测到的水流，水位和盐度的变化有很大贡献。因此，该模型具有逼真的水位，河流流量，风，沿海浮力流（由于密西西比河羽流）和地表热通量。定量度量用于评估模型对观测的性能，该模型通常很好地代表了潮汐和潮汐下水动力的空间和时间变化。测试了三个不同的非结构化网格，一个三角形网格未完全解析运输通道，一个三角形网格对其进行了解析，以及一个混合的四边形-三角形网格，其分辨率大致相同。结果表明，当重要的地形特征（如运输通道）得到解决时，盐度和潮下速度可以得到更好的预测。有必要在混合四边形-三角网格模拟中增加海底阻力的粗糙度，以达到与等效三角网格相似的性能。 （C）2015 Elsevier Ltd.保留所有权利。

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