Estimation of the Friction Velocity in Stably Stratified Boundary-Layer Flows Over Hills

• Tipo: Artigo em Revista Científica Internacional
• Data: 2009

Autores

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

Revista

Título: Boundary-Layer Meteorology

Vol. 130

Páginas: 15-28

ISSN: 0006-8314

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 10 Citações

Scopus - 10 Citações

Outras Informações

ID Authenticus: P-003-PAE

DOI: 10.1007/s10546-008-9329-3

Abstract (EN): A method is suggested for the calculation of the friction velocity for stable turbulent boundary-layer flow over hills. The method is tested using a continuous upstream mean velocity profile compatible with the propagation of gravity waves, and is incorporated into the linear model of Hunt, Leibovich and Richards with the modification proposed by Hunt, Richards and Brighton to include the effects of stability, and the reformulated solution of Weng for the near-surface region. Those theoretical results are compared with results from simulations using a non-hydrostatic microscale-mesoscale two-dimensional numerical model, and with field observations for different values of stability. These comparisons show a considerable improvement in the behaviour of the theoretical model when the friction velocity is calculated using the method proposed here, leading to a consistent variation of the boundary-layer structure with stability, and better agreement with observational and numerical data.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 14