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A study of the roughness effects of multiple windbreaks

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Abstract

A wind-tunnel study of the roughness effect of a network of uniformly spaced long parallel windbreaks has been attempted. The roughness parameterZ 0 in the well-known logarithmic profile has been obtained as a function of the ratio of the spacingL to heightH of the barriers. In one part of the study, a naturally developing boundary layer was used and the windbreaks were not spread on the entire wind-tunnel floor. Spacing ratiosL/H of 1 to 20 were treated. In the other part of the study, spires were used to thicken the boundary layers artificially and the windbreaks were spread throughout the wind-tunnel floor. In this case, spacing ratiosL/H of 1 to 30 were examined.

Values of the roughness parameter obtained from the above two cases have been compared to some (though very few) previously published pertinent values.

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Abbreviations

D :

zero-plane displacement

E :

windbreak thickness

H :

windbreak height

L :

distance between windbreaks

P :

windbreak porosity

U :

mean local velocity alongX coordinate

U′ :

instantaneous local velocity alongX coordinate

u′ :

fluctuating component of velocity alongX coordinate

√u′ 2 :

RMS root-mean-square value of the fluctuating component

U * :

friction velocity

U 0 :

mean free-stream velocity

X :

distance of velocity probe from leading edge of the windbreak

X, Y, Z :

three axial coordinates

Z G :

gradient height of the atmospheric boundary layer

Z 0 :

roughness parameter

δ :

boundary-layer thickness

κ :

von Kármán's constant

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Authors and Affiliations

  1. Dept. of Mechanical Engineering, The Uniuersity of British Columbia, Vancouver, B.C., Canada

    M. Iqbal & A. K. Khatry

  2. Station de Bioclimatologie, INRA, 84 Montfavet, France

    B. Seguin

Authors
  1. M. Iqbal
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  2. A. K. Khatry
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  3. B. Seguin
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Iqbal, M., Khatry, A.K. & Seguin, B. A study of the roughness effects of multiple windbreaks. Boundary-Layer Meteorol 11, 187–203 (1977). https://doi.org/10.1007/BF02166804

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  • DOI: https://doi.org/10.1007/BF02166804

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