Semiempirical Dissipation Source Functions for Ocean Waves. Part I: Definition, Calibration, and Validation
Semiempirical Dissipation Source Functions for Ocean Waves. Part I: Definition, Calibration, and Validation
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DOI：
10.1175/2010jpo4324.1
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发表时间：
2010-09-01
影响因子：
3.5
通讯作者：
Collard, Fabrice
中科院分区：
文献类型：
--
作者：
Ardhuin, Fabrice;Rogers, Erick;Collard, Fabrice
提出了新的风浪谱耗散参数化方法。耗散率没有预定的谱形状，是波谱、风速和风向的函数，在某种程度上与波浪破碎和膨胀耗散特性的观测一致。也就是说，膨胀耗散是非线性的，与膨胀陡度成正比，只有当无维谱超过观测到波浪开始破裂的阈值时，波浪破碎引起的耗散才非零。引入一个附加的短波耗散源来表示由于较长的破波而引起的短波耗散。减少产生短波的风浪是为了解释被较长波吸收的动量通量。这些参数化与非线性相互作用的离散相互作用近似相结合并校准。调整参数以重现观测到的方向波谱形状，以及谱矩随风速和波高的变化。波浪能量平衡在广泛的条件和尺度上得到验证，从全球海洋到沿海环境。利用原位和遥感数据验证了波高、峰值和平均周期以及光谱数据。一些系统缺陷仍然存在，但总的来说，参数化可能产生迄今为止最准确的波参数估计。并对今后的改进提出了展望。
New parameterizations for the spectral dissipation of wind-generated waves are proposed. The rates of dissipation have no predetermined spectral shapes and are functions of the wave spectrum and wind speed and direction, in a way consistent with observations of wave breaking and swell dissipation properties. Namely, the swell dissipation is nonlinear and proportional to the swell steepness, and dissipation due to wave breaking is nonzero only when a nondimensional spectrum exceeds the threshold at which waves are observed to start breaking. An additional source of short-wave dissipation is introduced to represent the dissipation of short waves due to longer breaking waves. A reduction of the wind-wave generation of short waves is meant to account for the momentum flux absorbed by longer waves. These parameterizations are combined and calibrated with the discrete interaction approximation for the nonlinear interactions. Parameters are adjusted to reproduce observed shapes of directional wave spectra, and the variability of spectral moments with wind speed and wave height. The wave energy balance is verified in a wide range of conditions and scales, from the global ocean to coastal settings. Wave height, peak and mean periods, and spectral data are validated using in situ and remote sensing data. Some systematic defects are still present, but, overall, the parameterizations probably yield the most accurate estimates of wave parameters to date. Perspectives for further improvement are also given.