Numerical study of island effects on Rayleigh waves
نویسنده
چکیده
To improve our understanding of Rayleigh wave generation and propagation in oceans, the effects of the presence of an island on the Rayleigh wave features are simulated. The analysis of results reveals Rayleigh wave generation in ocean near the island. In the water column, a decrease of amplitude in the vertical component and an increase of amplitude in the radial component of Rayleigh wave with depth are observed. The path of particle motion is elliptical clockwise, vertically polarised at the surface and horizontally polarised at the base of the water column. An increase of Rayleigh wave amplitude with island-slope (20° – 60°) is obtained, in contrast to the decrease of Rayleigh wave amplitude with increase of slope of basin-edge in the basin. The effect of island-slope is greater in the vertical component, as compared to the radial one. Responses of different submersed islands (0 – 75 m below water surface) reveal decrease of amplitude of island-induced Rayleigh waves with depth. The obtained results help us to understand the characteristics and the generation of Rayleigh waves near islands.
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