Wind-wave amplification mechanisms: possible models for steep wave events in finite depth

Carregando...
Imagem de Miniatura

Data

2013-01-01

Orientador

Coorientador

Pós-graduação

Curso de graduação

Título da Revista

ISSN da Revista

Título de Volume

Editor

Copernicus Gesellschaft Mbh

Tipo

Artigo

Direito de acesso

Acesso abertoAcesso Aberto

Resumo

We extend the Miles mechanism of wind-wave generation to finite depth. A beta-Miles linear growth rate depending on the depth and wind velocity is derived and allows the study of linear growth rates of surface waves from weak to moderate winds in finite depth h. The evolution of beta is plotted, for several values of the dispersion parameter kh with k the wave number. For constant depths we find that no matter what the values of wind velocities are, at small enough wave age the beta-Miles linear growth rates are in the known deep-water limit. However winds of moderate intensities prevent the waves from growing beyond a critical wave age, which is also constrained by the water depth and is less than the wave age limit of deep water. Depending on wave age and wind velocity, the Jeffreys and Miles mechanisms are compared to determine which of them dominates. A wind-forced nonlinear Schrodinger equation is derived and the Akhmediev, Peregrine and Kuznetsov-Ma breather solutions for weak wind inputs in finite depth h are obtained.

Descrição

Palavras-chave

Idioma

Inglês

Como citar

Natural Hazards And Earth System Sciences. Gottingen: Copernicus Gesellschaft Mbh, v. 13, n. 11, p. 2805-2813, 2013.

Itens relacionados