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Study on the Characteristics and Generated Simulation of Nonlinear Ocean Internal Waves in Northern South China Sea
Pages: 20-26
Year: Issue:  2
Journal: Ocean Technology

Keyword:  ocean internal wavesnorthern South China SeaSARgenerationparameters inversionpropagation;
Abstract: The study on ocean internal waves has become a frontier oceanographic subject for its significance in marine resources, military and engineering applications. In this paper, the kinetic parameters of internal waves,such as wavelength, wave velocity and amplitude width, have been inverted based on the SAR remote sensing data and combined with the KDV equation and Bragg scattering mechanism. As a case study of nonlinear internal waves in the northern South China Sea, an overall propagation trajectory shows that internal waves from the Luzon Strait moved westward to the Dongsha Island and then fractured into two types. The Type-I waves continue to move to the west while the type-II waves travel northwestward to the shore along the isobaths. As an important indicator, wave direction can effectively reflect the travel and change characteristics of internal waves. This paper calculates the direction change of internal wave propagation in a wave period with the directional spectrum model, and proves that the 180° directional fuzzy problem can be solved. Meanwhile, internal waves uplift the subsurface water and chlorophyll in the propagation process, and strengthen the energy transportation and the vertical mixing of the water. It is determined that the concentration of chlorophyll varies in a range of 0.08-0.35mg/m~3 with the propagation of internal waves, gradually toward the background value, and can reach the maximum of 0.35 mg/m~3. This paper uses the OTIS(Oregon State University Tidal Inversion Software) model to conduct the generation simulation for the internal waves in the entire continental shelf region in the northern South China Sea. The results show that the region with F >1.5 m~2/s~2 could motivate the generation of internal waves when warming water flows through the Luzon Strait into the northern South China Sea, and note that two sea ridges, the Lan-yu and Heng-chun, play an important role.
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