A linear study of high-drag states and flow stagnation produced by mountain waves

• Tipo: Artigo em Revista Científica Internacional
• Data: 2005

Autores

Teixeira, MAC (Autor) Outra; Miranda, PMA (Autor) Outra; Argain, JL (Autor) Outra; Valente, MA (Autor) Outra

Revista

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Título: Hrvatski Meteoroloski Casopis

Páginas: 475-479

ISSN: 1330-0083

Indexação

Scopus - 0 Citações

Outras Informações

ID Authenticus: P-007-EVG

Abstract (EN): A linear model of gravity waves generated by stratified airflow over mountains is developed. The model provides simple, closed-form formulas for the surface drag in a situation where conditions for wave resonance exist. The wind is constant near the surface and decreases linearly above. The drag normalized by its value in the absence of shear is found to depend on two parameters: the height of the interface where the shear is discontinuous and the Richardson number, Ri, in the region above. This drag attains maxima when the height of the interface induces constructive interference between the upward and downward propagating reflected waves, and minima when there is destructive interference. The amplitude of the drag modulation becomes larger for lower Ri. It is also shown that, for Ri<2.25, the locations where wave breaking is first predicted to occur in flow over a 2D ridge become displaced horizontally and vertically by an amount depending on Ri.

Idioma: Inglês

Tipo (Avaliação Docente): Científica