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Spectral short-circuiting and wake production within the canopy trunk space of an alpine hardwood forest

Publication ,  Journal Article
Cava, D; Katul, GG
Published in: Boundary-Layer Meteorology
March 1, 2008

Using synchronous multi-level high frequency velocity measurements, the turbulence spectra within the trunk space of an alpine hardwood forest were analysed. The spectral short-circuiting of the energy cascade for each velocity component was well reproduced by a simplified spectral model that retained return-to-isotropy and component-wise work done by turbulence against the drag and wake production. However, the use of an anisotropic drag coefficient was necessary to reproduce these measured component-wise spectra. The degree of anisotropy in the vertical drag was shown to vary with the element Reynolds number. The wake production frequency in the measured spectra was shown to be consistent with the vortex shedding frequency at constant Strouhal number given by fvs=0.21 ū/d, where d can be related to the stem diameter at breast height (dbh) and ū is the local mean velocity. The energetic scales, determined from the inflection point instability at the canopy'atmosphere interface, appear to persist into the trunk space when Cduacrhc/β ≫ 1, where Cdu is the longitudinal drag coefficient, ac is the crown-layer leaf area density, hc is the canopy height, and β is the dimensionless momentum absorption at the canopy top. © Springer Science+Business Media B.V. 2007.

Duke Scholars

Published In

Boundary-Layer Meteorology

DOI

ISSN

0006-8314

Publication Date

March 1, 2008

Volume

126

Issue

3

Start / End Page

415 / 431

Related Subject Headings

  • Meteorology & Atmospheric Sciences
  • 3701 Atmospheric sciences
  • 0401 Atmospheric Sciences
 

Citation

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Cava, D., & Katul, G. G. (2008). Spectral short-circuiting and wake production within the canopy trunk space of an alpine hardwood forest. Boundary-Layer Meteorology, 126(3), 415–431. https://doi.org/10.1007/s10546-007-9246-x
Cava, D., and G. G. Katul. “Spectral short-circuiting and wake production within the canopy trunk space of an alpine hardwood forest.” Boundary-Layer Meteorology 126, no. 3 (March 1, 2008): 415–31. https://doi.org/10.1007/s10546-007-9246-x.
Cava D, Katul GG. Spectral short-circuiting and wake production within the canopy trunk space of an alpine hardwood forest. Boundary-Layer Meteorology. 2008 Mar 1;126(3):415–31.
Cava, D., and G. G. Katul. “Spectral short-circuiting and wake production within the canopy trunk space of an alpine hardwood forest.” Boundary-Layer Meteorology, vol. 126, no. 3, Mar. 2008, pp. 415–31. Scopus, doi:10.1007/s10546-007-9246-x.
Cava D, Katul GG. Spectral short-circuiting and wake production within the canopy trunk space of an alpine hardwood forest. Boundary-Layer Meteorology. 2008 Mar 1;126(3):415–431.
Journal cover image

Published In

Boundary-Layer Meteorology

DOI

ISSN

0006-8314

Publication Date

March 1, 2008

Volume

126

Issue

3

Start / End Page

415 / 431

Related Subject Headings

  • Meteorology & Atmospheric Sciences
  • 3701 Atmospheric sciences
  • 0401 Atmospheric Sciences