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Numeričko istraživanje efekta otoka na Rayleigheve valove

Abstract

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.Kako bismo poboljšali razumijevanje nastanka i rasprostiranja Rayleighevih valova u oceanima simulirani su efekti otoka na obilježja Rayleigevih valova. Analizom rezultata pokazano je da se u oceanu u blizini otoka stvaraju Rayleighevi valovi. U vodenom stupcu se primjećuje smanjenje amplitude vertikalne komponente i povećanje amplitude radijalne komponente Raylieghevih valova s dubinom. Čestica se giba eliptično u smjeru gibanja kazaljke na satu, vertikalno je polarizirana na površini i horizontalno na dnu vodenog stupca. Zapaženo je povećanje amplitude Rayleighevog vala s nagibom otoka (20°–60°); nasuprot tome amplituda Rayleighevog vala u bazenu smanjuje se s povećanjem nagiba ruba bazena. Efekt nagiba otoka je ve}i u vertikalnoj komponenti nego u radijalnoj. Odziv različitih podvodnih otoka (0–75 m ispod površine vode) ukazuje na smanjenje amplitude s dubinom kod otokom induciranih Rayleighevih valova

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