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

• Type: Article in International Scientific Journal
• Date: 2009

Authors

Argain, JL (Author) Other; Miranda, PMA (Author) Other; Teixeira, MAC (Author) Other

Journal

Title: Boundary-Layer Meteorology

Vol. 130

Pages: 15-28

ISSN: 0006-8314

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 10 Citations

Scopus - 10 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 14