Diffraction and reflection of irregular waves in a harbor employing a spectral model

Anais da Academia Brasileira de Ciências

Nelson Violante-carvalho²  Rafael B. Paes-leme²  Domenico A. Accetta¹  Frederico Ostritz² 

[1] ,Universidade do Estado do Rio de Janeiro Faculdade de Oceanografia Rio de Janeiro RJ ,Brasil

关键词: wind waves;    SWAN model;    wave reflection;    wave diffraction;    wave transformations in a harbor;    ondas geradas pelo vento;    modelo de geração e propagação de ondas SWAN;    reflexão de ondas;    difração de ondas;    transformação de ondas em um porto;   

DOI  :  10.1590/S0001-37652009000400019

来源: SciELO

【 摘 要 】

The SWAN wave model is widely used in coastal waters and the main focus of this work is on its application in a harbor. Its last released version - SWAN 40.51 - includes an approximation to compute diffraction, however, so far there are few published works that discuss this matter. The performance of the model is therefore investigated in a harbor where reflection and diffraction play a relevant role. To assess its estimates, a phase-resolving Boussinesq wave model is employed as well, together with measurements carried out at a small-scale model of the area behind the breakwater. For irregular, short-crested waves with broad directional spreading, the importance of diffraction is relatively small. On the other hand, reflection of the incident waves is significant, increasing the energy inside the harbor. Nevertheless, the SWAN model does not achieve convergence when it is set to compute diffraction and reflection simultaneously. It is concluded that, for situations typically encountered in harbors, with irregular waves near reflective obstacles, the model should be set without the diffraction option.

【 授权许可】

CC BY   
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