Internal Wave Mixing near Energetic Sources

本研究通过研究几种不同类型的非线性内波相互作用问题，探讨了内波在近源混频中的作用。数值实验将用于检验三种不同的制度。第一个将在一个用高能量、随机相位的内波场初始化的实验中观察短内波和长内波之间的非线性能量级联，该内波场的频谱与加勒特和蒙克的假设相似。第二组实验将着眼于能量从M2潮汐频率的内波转移到更高频率的内波，这是由潮汐在地形上的漂移所迫，当这种转移被内波背景场的存在所催化时。第三个重点是风激近惯性波与非惯性内波之间的相互作用。数值实验将采用三维、非流体静力、伪谱代码进行。数值结果将与以前在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.