Skip to main content
release_alert
Welcome to the new Scholars 3.0! Read about new features and let us know what you think.
cancel
Journal cover image

The structure of turbulence near a tall forest edge: the backward-facing step flow analogy revisited.

Publication ,  Journal Article
Detto, M; Katul, GG; Siqueira, M; Juang, J-Y; Stoy, P
Published in: Ecological Applications : a Publication of the Ecological Society of America
September 2008

Flow disturbances near tall forest edges are receiving significant attention in diverse disciplines including ecology, forest management, meteorology, and fluid mechanics. Current theories suggest that near a forest edge, when the flow originates from a forest into a large clearing, the flow retains its forest canopy turbulence structure at the exit point. Here, we propose that this framework is not sufficiently general for dense forested edges and suggest that the flow shares several attributes with backward-facing step (BFS) flow. Similar analogies, such as rotor-like circulations, have been proposed by a number of investigators, though the consequences of such circulations on the primary terms in the mean momentum balance at the forest clearing edge have rarely been studied in the field. Using an array of three triaxial sonic anemometers positioned to measure horizontal and vertical gradients of the velocity statistics near a forest edge, we show that the flow structure is more consistent with an intermittent recirculation pattern, rather than a continuous rotor, whose genesis resembles the BFS flow. We also show that the lateral velocity variance, v'2, is the moment that adjusts most slowly with downwind distance as the flow exits from the forest into the clearing. Surprisingly, the longitudinal and vertical velocity variances (u'2 and w'2) at the forest edge were comparable in magnitude to their respective values at the center of a large grass-covered forest clearing, suggesting rapid adjustment at the edge. Discussions on how the forest edge modifies the spectra and co-spectra of momentum fluxes, effective mixing length, and static pressure are also presented.

Duke Scholars

Altmetric Attention Stats
Dimensions Citation Stats

Published In

Ecological Applications : a Publication of the Ecological Society of America

DOI

ISSN

1051-0761

Publication Date

September 2008

Volume

18

Issue

6

Start / End Page

1420 / 1435

Related Subject Headings

  • Trees
  • Poaceae
  • Models, Statistical
  • Ecosystem
  • Ecology
  • Air Movements
  • 07 Agricultural and Veterinary Sciences
  • 06 Biological Sciences
  • 05 Environmental Sciences
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Detto, M., Katul, G. G., Siqueira, M., Juang, J.-Y., & Stoy, P. (2008). The structure of turbulence near a tall forest edge: the backward-facing step flow analogy revisited. Ecological Applications : A Publication of the Ecological Society of America, 18(6), 1420–1435. https://doi.org/10.1890/06-0920.1
Detto, Matteo, Gabriel G. Katul, Mario Siqueira, Jehn-Yih Juang, and Paul Stoy. “The structure of turbulence near a tall forest edge: the backward-facing step flow analogy revisited.Ecological Applications : A Publication of the Ecological Society of America 18, no. 6 (September 2008): 1420–35. https://doi.org/10.1890/06-0920.1.
Detto M, Katul GG, Siqueira M, Juang J-Y, Stoy P. The structure of turbulence near a tall forest edge: the backward-facing step flow analogy revisited. Ecological Applications : a Publication of the Ecological Society of America. 2008 Sep;18(6):1420–35.
Detto, Matteo, et al. “The structure of turbulence near a tall forest edge: the backward-facing step flow analogy revisited.Ecological Applications : A Publication of the Ecological Society of America, vol. 18, no. 6, Sept. 2008, pp. 1420–35. Epmc, doi:10.1890/06-0920.1.
Detto M, Katul GG, Siqueira M, Juang J-Y, Stoy P. The structure of turbulence near a tall forest edge: the backward-facing step flow analogy revisited. Ecological Applications : a Publication of the Ecological Society of America. 2008 Sep;18(6):1420–1435.
Journal cover image

Published In

Ecological Applications : a Publication of the Ecological Society of America

DOI

ISSN

1051-0761

Publication Date

September 2008

Volume

18

Issue

6

Start / End Page

1420 / 1435

Related Subject Headings

  • Trees
  • Poaceae
  • Models, Statistical
  • Ecosystem
  • Ecology
  • Air Movements
  • 07 Agricultural and Veterinary Sciences
  • 06 Biological Sciences
  • 05 Environmental Sciences