Turbulence velocity spectra dependence on the mean wind at the bottom of a valley

Roberto Magnago, Osvaldo Moraes and Otávio Acevedo

Physica A: Statistical Mechanics and its Applications, 2009, vol. 388, issue 9, 1908-1916

Abstract: A spectral analysis of the surface boundary layer turbulence at the bottom of a valley is presented. The spectra were classified according to wind speed, wind direction with respect to the valley axis and stability condition. The results reveal that the vertical velocity spectra have a well defined peak in all cases. The average spectra are better defined for mean winds parallel to the valley axis. For transversal winds, a large scatter occurs. The peak of the vertical velocity spectra happens at smaller frequencies for winds parallel to the valley axis than when the winds are transversal to the valley. The stability dependence of the spectral peak frequency of the vertical component is larger for winds larger than 1 m s−1. The spectra of the horizontal components show low-frequency peaks, probably associated to mesoescala exchange. The frequency peak of the horizontal spectra does not depend on stability for convective conditions. For stable conditions, the peak frequency increases as it gets more stable. Local isotropy occurs at large frequencies for both wind directions with respect to the valley axis.

Keywords: Turbulence spectra; Complex terrain; Valley flow (search for similar items in EconPapers)
Date: 2009
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0378437109000508
Full text for ScienceDirect subscribers only. Journal offers the option of making the article available online on Science direct for a fee of $3,000

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:388:y:2009:i:9:p:1908-1916

DOI: 10.1016/j.physa.2009.01.022

Access Statistics for this article

Physica A: Statistical Mechanics and its Applications is currently edited by K. A. Dawson, J. O. Indekeu, H.E. Stanley and C. Tsallis

More articles in Physica A: Statistical Mechanics and its Applications from Elsevier
Bibliographic data for series maintained by Catherine Liu ().