Numerical modeling of space-time wave extremes using WAVEWATCH III
Numerical modeling of space-time wave extremes using WAVEWATCH III
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DOI：
10.1007/s10236-016-1025-0
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发表时间：
2017-04-01
期刊：
影响因子：
2.3
通讯作者：
Tolman, Hendrik
中科院分区：
文献类型：
--
作者：
Barbariol, Francesco;Alves, Jose-Henrique G. M.;Tolman, Hendrik
提出了一种在谱波模型 WAVEWATCH III (WW3) 内估计时空波极值参数的新颖实现。 WW3 版本 5.16 中提供的新输出参数依赖于 Benetazzo 等人扩展的 Fedele 理论模型 (J Phys Oceanogr 42(9): 1601-1615, 2012)。 (J Phys Oceanogr 45( 9): 2261-2275, 2015) 估计给定时空区域的最大二阶非线性波峰高度。为了评估与最大波峰高度和最大波高（通常在宽带暴风雨海况中不同）相关的波高，考虑了Boccotti（2000）的线性准决定论理论。新的 WW3 实施通过模拟地中海上空的海况和时空极端情况（由 COSMO-ME 大气模型产生的风场强制）进行测试。将模型模拟与 2014 年 3 月 10 日在亚得里亚海北部（意大利）通过安装在“Acqua Alta”海洋学塔上的立体摄像系统观测到的时空波最大值进行了比较。结果表明，模拟的时空极值与观测结果基本一致。差异主要归因于风力强迫的准确性，在较小程度上归因于时空极值参数化中引入的近似值。在大于平均波长的区域（例如，模型网格尺寸），模型估计预计会更加准确。
A novel implementation of parameters estimating the space-time wave extremes within the spectral wave modelWAVEWATCH III (WW3) is presented. The new output parameters, available in WW3 version 5.16, rely on the theoretical model of Fedele (J Phys Oceanogr 42( 9): 1601-1615, 2012) extended by Benetazzo et al. (J Phys Oceanogr 45( 9): 2261-2275, 2015) to estimate the maximum secondorder nonlinear crest height over a given space-time region. In order to assess the wave height associated to the maximum crest height and the maximum wave height (generally different in a broad-band stormy sea state), the linear quasi-determinism theory of Boccotti (2000) is considered. The new WW3 implementation is tested by simulating sea states and space-time extremes over the Mediterranean Sea ( forced by the wind fields produced by the COSMO-ME atmospheric model). Model simulations are compared to space-time wave maxima observed on March 10th, 2014, in the northern Adriatic Sea (Italy), by a stereo camera system installed on-board the "Acqua Alta" oceanographic tower. Results show that modeled space-time extremes are in general agreement with observations. Differences are mostly ascribed to the accuracy of the wind forcing and, to a lesser extent, to the approximations introduced in the space-time extremes parameterizations. Model estimates are expected to be even more accurate over areas larger than the mean wavelength (for instance, the model grid size).