Study of the Nnumerical Simulation of Large-amplitude Internal Waves in North of South China Sea

摘要

The amplitudes of internal waves could reach over 100m.Large-amplitude internal waves may cause severe damage to the ocean engineering and submarine. In this paper, with the assumption that the fluid is in a two-layer stratification system, the fullynonlinear Schrodinger equation (FNLS) that describes large-amplitude internal wave propagation in deep sea is derived from the governing equations of hydrodynamics by introducing the perturbation expansions. The large-amplitude internal waves behavior in north of South China Sea (SCS) is numerically simulated by this equation. Moreover, based on the analysis of waveform and the calculation of characteristic parameters, we find our results are in agreement with the SAR remote images and situ observation data. Finally, some mechanisms that underlie the internal wave propagation are revealed.