Modeling wetting and drying scheme based on an extended logarithmic law for a three-dimensional sigma-coordinate coastal ocean model
Modeling wetting and drying scheme based on an extended logarithmic law for a three-dimensional sigma-coordinate coastal ocean model
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基于三维西格玛坐标沿海海洋模型的扩展对数定律的干湿方案建模
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
Y. Uchiyama
中科院分区：
文献类型：
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作者：
Y. Uchiyama
一个湿干方案(WDS)被发展到一个三维近海模型(POM；Blumberg和Mellor，1983)中，提出了一个扩展的对数剖面在床边界层内和之上，以精确地模拟极浅近海的三维水动力。虽然WDS的形式简单，但它可以选择性地保持区域内的计算稳健性和水质量守恒性。经验证，WD-POM模型与Carrier和Greenspan(1958)提出的斜滩上非线性长波传播的解析解符合得很好。WD-POM还应用于美国加利福尼亚州旧金山湾的潮汐模拟，那里被巨大的潮间带包围着。将模型生成的海面高程和潮流与NOS-NOAA(2003)的观测数据进行了比较，结果表明WD-POM能够精确地再现旧金山湾河口潮间带的水动力。通过对有无WDS的模拟结果的比较，考察了潮间带地形对河口水动力的影响。湿润和干燥的过程被认为显著改变了旧金山湾的潮汐波和流场的发展。潮间带倾斜测深似乎增强了潮波的折射和浅化，潮波以开尔文波的形式逆时针传播。潮间带效应明显地改变了潮波的幅值和相速，并使潮流方向向岸边方向移动。
A wetting and drying scheme (WDS) is developed to incorporate into a three-dimensional sigmacoordinate coastal ocean model (POM; Blumberg and Mellor, 1983) with proposing an extended logarithmic profile within and above bed boundary layers to accurately simulate 3D hydrodynamics in extremely shallow coastal seas. While the WDS is simplistically formulated, it can selectively retain the computational robustness and water mass conservation in the domain. The developed model, WD-POM, is verified to have a good agreement with the analytical solution for non-linear long-waves propagating on a sloping beach proposed by Carrier and Greenspan (1958). WD-POM is also applied to a tidal simulation in San Francisco Bay, California, USA, which is encompassed by huge intertidal areas. The model-generated surface elevations and tidal currents are compared to the observed data-set by NOS-NOAA (2003) and demonstrate that WD-POM is capable of precisely reproducing the estuarine intertidal hydrodynamics in San Francisco Bay. The influence of intertidal topographies on estuarine hydrodynamics is next examined, by comparing between the simulated result with WDS and that without WDS. The wetting and drying process is represented to significantly alter development of tidal waves and a current field in San Francisco Bay. The intertidal sloping bathymetry appears to enhance refraction and shoaling of tidal waves propagating anticlockwise as Kelvin waves. The intertidal effects are evidently exhibited to modify the amplitude and phase speed of the tidal waves, and to shift the current direction to be shore-normal.