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A Velocity-Dissipation Lagrangian Stochastic Model for Turbulent Dispersion in Atmospheric Boundary-Layer and Canopy Flows

Publication ,  Journal Article
Duman, T; Katul, GG; Siqueira, MB; Cassiani, M
Published in: Boundary-Layer Meteorology
January 1, 2014

An extended Lagrangian stochastic dispersion model that includes time variations of the turbulent kinetic energy dissipation rate is proposed. The instantaneous dissipation rate is described by a log-normal distribution to account for rare and intense bursts of dissipation occurring over short durations. This behaviour of the instantaneous dissipation rate is consistent with field measurements inside a pine forest and with published dissipation rate measurements in the atmospheric surface layer. The extended model is also shown to satisfy the well-mixed condition even for the highly inhomogeneous case of canopy flow. Application of this model to atmospheric boundary-layer and canopy flows reveals two types of motion that cannot be predicted by conventional dispersion models: a strong sweeping motion of particles towards the ground, and strong intermittent ejections of particles from the surface or canopy layer, which allows these particles to escape low-velocity regions to a high-velocity zone in the free air above. This ejective phenomenon increases the probability of marked fluid particles to reach far regions, creating a heavy tail in the mean concentration far from the scalar source. © 2014 Springer Science+Business Media Dordrecht.

Duke Scholars

Published In

Boundary-Layer Meteorology

DOI

ISSN

0006-8314

Publication Date

January 1, 2014

Volume

152

Issue

1

Start / End Page

1 / 18

Related Subject Headings

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

Citation

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ICMJE
MLA
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Duman, T., Katul, G. G., Siqueira, M. B., & Cassiani, M. (2014). A Velocity-Dissipation Lagrangian Stochastic Model for Turbulent Dispersion in Atmospheric Boundary-Layer and Canopy Flows. Boundary-Layer Meteorology, 152(1), 1–18. https://doi.org/10.1007/s10546-014-9914-6
Duman, T., G. G. Katul, M. B. Siqueira, and M. Cassiani. “A Velocity-Dissipation Lagrangian Stochastic Model for Turbulent Dispersion in Atmospheric Boundary-Layer and Canopy Flows.” Boundary-Layer Meteorology 152, no. 1 (January 1, 2014): 1–18. https://doi.org/10.1007/s10546-014-9914-6.
Duman T, Katul GG, Siqueira MB, Cassiani M. A Velocity-Dissipation Lagrangian Stochastic Model for Turbulent Dispersion in Atmospheric Boundary-Layer and Canopy Flows. Boundary-Layer Meteorology. 2014 Jan 1;152(1):1–18.
Duman, T., et al. “A Velocity-Dissipation Lagrangian Stochastic Model for Turbulent Dispersion in Atmospheric Boundary-Layer and Canopy Flows.” Boundary-Layer Meteorology, vol. 152, no. 1, Jan. 2014, pp. 1–18. Scopus, doi:10.1007/s10546-014-9914-6.
Duman T, Katul GG, Siqueira MB, Cassiani M. A Velocity-Dissipation Lagrangian Stochastic Model for Turbulent Dispersion in Atmospheric Boundary-Layer and Canopy Flows. Boundary-Layer Meteorology. 2014 Jan 1;152(1):1–18.
Journal cover image

Published In

Boundary-Layer Meteorology

DOI

ISSN

0006-8314

Publication Date

January 1, 2014

Volume

152

Issue

1

Start / End Page

1 / 18

Related Subject Headings

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