Boundary-Layer Meteorology

, Volume 10, Issue 2, pp 199–220 | Cite as

Turbulent transport within and above a maize canopy

  • R. G. BillJr.
  • L. H. AllenJr.
  • T. Audunson
  • B. Gebhart
  • E. Lemon
Article
Revised:

Abstract

Hot-wire anemometers were used to measure air temperature and the three velocity components of the wind within and above a maize canopy. From digitized anemometer outputs, correlation coefficients for vertical heat flux and turbulent momentum transfer were calculated. A comparison of these coefficients with profiles of mean wind speed and mean temperature indicates that the main features of the turbulence may be explained in terms of the usual mixing-length theory. Instantaneous records of heat and momentum flux, however, indicate the existence of other competing turbulent mechanisms due to the unsteady, non-equilibrium nature of the turbulent flow. Regimes of flow dominated by mechanical and/or thermal mixing are indicated. Spectral results show that high shear and turbulent intensity levels as well as the presence of the maize leaves and stalks as vortex-shedding surfaces complicate the energy transfer mechanism. An energy balance between radiation and convection reveals that the energy budget is primarily a balance between solar radiation and the flux of latent heat.

Keywords

Heat Flux Turbulent Intensity Momentum Flux Turbulent Transport Maize Leave 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© D. Reidel Publishing Company 1976

Authors and Affiliations

  • R. G. BillJr.
  • L. H. AllenJr.
  • T. Audunson
  • B. Gebhart
  • E. Lemon

There are no affiliations available

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