A unified directional spectrum for long and short wind-driven waves
A unified directional spectrum for long and short wind-driven waves
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DOI：
10.1029/97jc00467
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发表时间：
1997-07-15
影响因子：
3.6
通讯作者：
Vandemark, D
中科院分区：
文献类型：
--
作者：
Elfouhaily, T;Chapron, B;Vandemark, D
回顾最近的几个海洋表面波模型发现，虽然在许多方面是全面的，这些谱模型不满足某些额外的，但基本的标准。我们建议，这些标准包括正确描述不同取气条件的能力，以及在高波数区域与现场观测的考克斯和蒙克[1954]、Jahne和Riemer [1990]以及Hara等人[1994]数据相一致的能力。此外，我们发现许多分析上不可取的方面，如跨波数限制，非物理调谐或调整参数，和非中心对称的方向扩展函数的不连续性。本文描述了一个二维波数谱有效的所有波数和分析适用于电磁模型。两种状态模式是根据联合北海波浪计划（JONSWAP）在长波状态下和菲利普斯[1985]和Kitaigorodskii [1973]在高波数状态下的工作制定的。全方位和风依赖的频谱构建同意过去和最近的观测，包括上述标准。该模式的主要特点是对高、低波数区域的描述相似;这两种形式都强调风与波之间摩擦的海气相互作用过程（即，广义波龄，u/c）在所有波长同时发生。这种波龄参数化是波谱的统一特征。谱的方向扩展函数关于风向对称，并且具有波数和风速依赖性。一个比率的方法进行描述，使这种扩散函数与以前的非中心对称形式的比较。雷达数据被有意地排除在频谱开发之外。最后，通过使用Kitaigorodskii边界层模型推导粗糙度长度，对谱进行了检验。我们的阻力系数与风速和波龄的推断与海上湿度交换（HEXOS）活动的结果令人鼓舞的协议。
Review of several recent ocean surface wave models finds that while comprehensive in many regards, these spectral models do not satisfy certain additional, but fundamental, criteria. We propose that these criteria include the ability to properly describe diverse fetch conditions and to provide agreement with in situ observations of Cox and Munk [1954] and Jahne and Riemer [1990] and Hara et al. [1994] data in the high-wavenumber regime. Moreover, we find numerous analytically undesirable aspects such as discontinuities across wavenumber limits, nonphysical tuning or adjustment parameters, and noncentrosymmetric directional spreading functions. This paper describes a two-dimensional wavenumber spectrum valid over all wavenumbers and analytically amenable to usage in electromagnetic models. The two regime model is formulated based on the Joint North Sea Wave Project (JONSWAP) in the long-wave regime and on the work of Phillips [1985] and Kitaigorodskii [1973] at the high wavenumbers. The;omnidirectional and wind-dependent spectrum is constructed to agree with past and recent observations including the criteria mentioned above. The key feature of this model is the similarity of description for the high- and low-wavenumber regimes; both forms are posed to stress that the air-sea interaction process of friction between wind and waves (i.e., generalized wave age, u/c) is occurring at all wavelengths simultaneously. This wave age parameterization is the unifying feature of the spectrum. The spectrum's directional spreading function is symmetric about the wind direction and has both wavenumber and wind speed dependence. A ratio method is described that enables comparison of this spreading function with previous noncentrosymmetric forms. Radar data are purposefully excluded from this spectral development. Finally, a test of the spectrum is made by deriving roughness length using the boundary layer model of Kitaigorodskii. Our inference of drag coefficient versus wind speed and wave age shows encouraging agreement with Humidity Exchange Over the Sea (HEXOS) campaign results.