Article
 

Turbulence in Sparse, Organized Vegetative Canopies: A Large-Eddy Simulation Study

Public Deposited

Downloadable Content

Download PDF
https://ir.library.oregonstate.edu/concern/articles/3f462733k

Descriptions

Attribute NameValues
Creator
Abstract
  • A large-eddy simulation study was performed to characterize turbulence in sparse, row-oriented canopies. This was accomplished by simulating a set of heterogeneous row-oriented canopies with varying row vegetation density and spacing. To determine the effects of heterogeneity, results were compared to horizontally homogeneous canopies with an equivalent ‘effective’ leaf area index. By using a proper effective leaf area index, plane-averaged mean velocities and bulk scaling parameters contained only small errors when heterogeneity was ignored. However, many cases had significantly larger second- and third-order velocity moments in the presence of heterogeneity. Some heterogeneous canopies also contained dispersive fluxes in the lower canopy that were over 20% as large as the turbulent flux. Impacts of heterogeneity were most pronounced in the cases of large row leaf area density and widely spaced rows. Despite the substantial amount of open space in the sparse canopies, vertical velocity skewness and quadrant-hole analysis indicated that the flow behaved predominantly as a canopy layer even though integral length scales at the canopy top no longer followed mixing-layer scaling. This was supported by the fact that similar composite-averaged coherent structures could be readily identified in both the heterogeneous and homogeneous canopies. Heterogeneity had an effect on coherent structures, in that structure detection events were most likely to occur just upwind of the vegetation rows. In simulations with large row spacing, these structures also penetrated deeper into the canopy when compared to the equivalent homogeneous canopy.
  • Keywords: Dispersive flux, Large-eddy simulation, Sparse canopy, Vineyard
Resource Type
DOI
Date Available
Date Issued
Citation
  • Bailey, B. N., & Stoll, R. (2013). Turbulence in Sparse, Organized Vegetative Canopies: A Large-Eddy Simulation Study. Boundary-Layer Meteorology, 147(3), 369-400. doi:10.1007/s10546-012-9796-4
Journal Title
Journal Volume
  • 147
Journal Issue/Number
  • 3
Rights Statement
Funding Statement (additional comments about funding)
  • This research was partially supported by the University of Utah Research Foundation and National Science Foundation grant IDR CBET-PDM 113458.
Publisher
Peer Reviewed
Language
Replaces

Relationships

Parents:

This work has no parents.

Items

Thumbnail Title Date Uploaded Visibility Actions
file details BaileyBrianMechanicalEngineeringTurbulenceSparseOrganizedVegetativeCanopies.pdf 2017-07-26 Public Download