Spectral form and source term balance of short gravity wind waves
Spectral form and source term balance of short gravity wind waves
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DOI：
10.1002/2014jc009869
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发表时间：
2014-11
影响因子：
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通讯作者：
H. Tamura;W. Drennan;E. Sahlée;H. Graber
中科院分区：
文献类型：
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作者：
H. Tamura;W. Drennan;E. Sahlée;H. Graber
利用海气相互作用浮筒（ASIS）现场观测资料，研究了短重力波的波谱结构和源项平衡。在广泛的风浪条件下，分析了高达10 rad/m的波数谱（重力波谱）的行为。观测到的波数谱显示了Toba（1973）和Phillips（1958）所描述的谱功率定律，以及在整个风速范围内谱能保持恒定的~ 10 rad/m的特征节点。我们还利用非线性耗散项改进了第三代波模型。波浪模型再现了高波数域的频谱形式。在平衡范围内，非线性传递对维持平衡条件起主要作用。另一方面，在从平衡范围上限开始的饱和范围内，非线性传递与其他源项趋于不平衡，耗散项与风输入趋于平衡。
We investigated the spectral structure and source term balance of short gravity waves, based on in situ observations of wave number spectra retrieved by air-sea interaction spar (ASIS) buoys. The behaviors of wave number spectra up to 10 rad/m (the gravity wave regime) were analyzed for a wide range of wind and wave conditions. The observed wave number spectra showed the spectral power laws described by Toba (1973) and Phillips (1958) in addition to the characteristic nodal point at ∼10 rad/m where spectral energy becomes constant over the entire wind speed range. We also improved the third-generation wave model using the nonlinear dissipation term. The wave model reproduced the spectral form in the higher wave number domain. In the equilibrium range, nonlinear transfer played a major role in maintaining equilibrium conditions. On the other hand, in the saturation range, which starts at the upper limit of the equilibrium range, the nonlinear transfer tended to be out of balance with other source terms, and the dissipation term was in balance with wind input.