Scaling and Similarity of the Anisotropic Coherent Eddies in Near-Surface Atmospheric Turbulence
Abstract
The low-wavenumber regime of the spectrum of turbulence commensurate with Townsend’s “attached” eddies is investigated here for the near-neutral atmospheric surface layer (ASL) and the roughness sublayer (RSL) above vegetation canopies. The central thesis corroborates the importance of the imbalance between local production and dissipation of turbulence kinetic energy (TKE) and canopy shear in challenging the classical distance-from-the-wall scaling of canonical turbulent boundary layers. Using five experimental datasets (two vegetation canopy RSL flows, two ASL flows, and one open-channel experiment), this paper explores (i) the existence of a low-wavenumber k–1 scaling law in the (wind) velocity spectra or, equivalently, a logarithmic scaling ln(r) in the velocity structure functions; (ii) phenomenological aspects of these anisotropic scales as a departure from homogeneous and isotropic scales; and (iii) the collapse of experimental data when plotted with different similarity coordinates. The results show that the extent of the k–1 and/or ln(r) scaling for the longitudinal velocity is shorter in the RSL above canopies than in the ASL because of smaller scale separation in the former. Conversely, these scaling laws are absent in the vertical velocity spectra except at large distances from the wall. The assessment reflects that the statistics of the velocity differences Δumore »
- Authors:
-
- Nicholas School of the Environment, Duke University, Durham, North Carolina
- Department of Civil and Environmental Engineering, Princeton University, Princeton, New Jersey
- Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, Montana
- Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, California
- Publication Date:
- Research Org.:
- Duke Univ., Durham, NC (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF)
- OSTI Identifier:
- 1426529
- Alternate Identifier(s):
- OSTI ID: 1541827
- Grant/Contract Number:
- SC0006967; SC0011461
- Resource Type:
- Published Article
- Journal Name:
- Journal of the Atmospheric Sciences
- Additional Journal Information:
- Journal Name: Journal of the Atmospheric Sciences Journal Volume: 75 Journal Issue: 3; Journal ID: ISSN 0022-4928
- Publisher:
- American Meteorological Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Atmosphere; Forest canopy; Turbulence; Boundary layer
Citation Formats
Ghannam, Khaled, Katul, Gabriel G., Bou-Zeid, Elie, Gerken, Tobias, and Chamecki, Marcelo. Scaling and Similarity of the Anisotropic Coherent Eddies in Near-Surface Atmospheric Turbulence. United States: N. p., 2018.
Web. doi:10.1175/JAS-D-17-0246.1.
Ghannam, Khaled, Katul, Gabriel G., Bou-Zeid, Elie, Gerken, Tobias, & Chamecki, Marcelo. Scaling and Similarity of the Anisotropic Coherent Eddies in Near-Surface Atmospheric Turbulence. United States. https://doi.org/10.1175/JAS-D-17-0246.1
Ghannam, Khaled, Katul, Gabriel G., Bou-Zeid, Elie, Gerken, Tobias, and Chamecki, Marcelo. Thu .
"Scaling and Similarity of the Anisotropic Coherent Eddies in Near-Surface Atmospheric Turbulence". United States. https://doi.org/10.1175/JAS-D-17-0246.1.
@article{osti_1426529,
title = {Scaling and Similarity of the Anisotropic Coherent Eddies in Near-Surface Atmospheric Turbulence},
author = {Ghannam, Khaled and Katul, Gabriel G. and Bou-Zeid, Elie and Gerken, Tobias and Chamecki, Marcelo},
abstractNote = {The low-wavenumber regime of the spectrum of turbulence commensurate with Townsend’s “attached” eddies is investigated here for the near-neutral atmospheric surface layer (ASL) and the roughness sublayer (RSL) above vegetation canopies. The central thesis corroborates the importance of the imbalance between local production and dissipation of turbulence kinetic energy (TKE) and canopy shear in challenging the classical distance-from-the-wall scaling of canonical turbulent boundary layers. Using five experimental datasets (two vegetation canopy RSL flows, two ASL flows, and one open-channel experiment), this paper explores (i) the existence of a low-wavenumber k–1 scaling law in the (wind) velocity spectra or, equivalently, a logarithmic scaling ln(r) in the velocity structure functions; (ii) phenomenological aspects of these anisotropic scales as a departure from homogeneous and isotropic scales; and (iii) the collapse of experimental data when plotted with different similarity coordinates. The results show that the extent of the k–1 and/or ln(r) scaling for the longitudinal velocity is shorter in the RSL above canopies than in the ASL because of smaller scale separation in the former. Conversely, these scaling laws are absent in the vertical velocity spectra except at large distances from the wall. The assessment reflects that the statistics of the velocity differences Δu and Δw approach a Gaussian-like behavior at large scales and that these eddies are responsible for momentum/energy production corroborated by large positive (negative) excursions in Δu accompanied by negative (positive) ones in Δw. A length scale based on TKE dissipation collapses the velocity structure functions at different heights better than the inertial length scale.},
doi = {10.1175/JAS-D-17-0246.1},
journal = {Journal of the Atmospheric Sciences},
number = 3,
volume = 75,
place = {United States},
year = {Thu Mar 01 00:00:00 EST 2018},
month = {Thu Mar 01 00:00:00 EST 2018}
}
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