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Wind Statistics from a Forested Landscape
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. (Henrik Alfredsson)ORCID iD: 0000-0001-8667-0520
2015 (English)In: Boundary-layer Meteorology, ISSN 0006-8314, E-ISSN 1573-1472, Vol. 156, no 1, 53-71 p.Article in journal (Refereed) Published
Abstract [en]

An analysis and interpretation of measurements from a 138-m tall tower located in a forested landscape is presented. Measurement errors and statistical uncertainties are carefully evaluated to ensure high data quality. A 40 wide wind-direction sector is selected as the most representative for large-scale forest conditions, and from that sector first-, second- and third-order statistics, as well as analyses regarding the characteristic length scale, the flux-profile relationship and surface roughness are presented for a wide range of stability conditions. The results are discussed with focus on the validity of different scaling regimes. Significant wind veer, decay of momentum fluxes and reduction in shear length scales with height are observed for all stability classes, indicating the influence of the limited depth of the boundary layer on the measured profiles. Roughness sublayer characteristics are however not detected in the presented analysis. Dimensionless gradients are shown to follow theoretical curves up to 100 m in stable conditions despite surface-layer approximations being invalid. This is attributed to a balance of momentum decay and reduced shear length scale growth with height. The wind profile shows a strong stability dependence of the aerodynamic roughness length, with a 50 % decrease from neutral to stable conditions.

Place, publisher, year, edition, pages
2015. Vol. 156, no 1, 53-71 p.
Keyword [en]
Above-canopy turbulence statistics, Atmospheric boundary layer, Roughness length, Surface-layer scaling, Wind power
National Category
Meteorology and Atmospheric Sciences
Identifiers
URN: urn:nbn:se:kth:diva-170278DOI: 10.1007/s10546-015-0016-xISI: 000355153200004Scopus ID: 2-s2.0-84929965186OAI: oai:DiVA.org:kth-170278DiVA: diva2:828493
Funder
Swedish Energy AgencyStandUp for Wind
Note

QC 20150630

Available from: 2015-06-30 Created: 2015-06-29 Last updated: 2017-12-04Bibliographically approved

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Segalini, Antonio

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