Internal Wave Mixing near Energetic Sources

通过研究几种不同类型的非线性内波相互作用问题，研究了内波在内波近源区混频中的作用。数值实验将被用来检验三种不同的区域。首先，我们将在一个简陋的实验中观察短波和长波之间的非线性能量级联，该实验以高能随机相位内波场为初始，其频谱类似于Garrett和Munk假设的频谱。第二组实验将着眼于从M2潮汐频率的内波到更高频率的内波的能量转移，当内波的背景场存在时，这种转移被地形上的潮汐漂移所强迫。第三个重点是风强迫的近惯性波与非惯性内波之间的相互作用。数值实验将使用三维、非静力、伪谱程序进行。数值结果将与之前各种海洋和海岸实验中收集的现场数据进行比较。

This study examines the role of internal waves in mixing near source regions of internal waves by studying several different types of non-linear internal-wave interaction problems. Numerical experiments will be used to examine three different regimes. The first will look at the nonlinear cascade of energy between short and long internal waves in a run-down experiment initialized with a high-energy, random-phase internal wave field with a spectrum similar to that postulated by Garrett and Munk. The second set of experiments will look at energy transfer from internal waves at the frequency of the M2 tide, forced by tidal excursions over topography, to higher frequency internal waves when that tranfer is catalyzed by the presence of a background field of internal waves. The third focus is on interactions between wind-forced near-inertial waves and non-inertial internal waves. The numerical experiments will be conducted with a three-dimensional, non-hydrostatic, psuedospectral code. The numerical results will be compared to field data collected during a variety of prior oceanic and coastal experiments.