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Some Atmospheric Turbulence and Stability Effects on Aerial Spray Penetration into Hardwood Forest Canopies

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Vertical profiles of wind, turbulence, and stability were measured in and above a partially foliated 16 m tall, oak forest during a series of single-swath, aerial spray trials. The distribution of cross-swath spray deposits was sampled after each application at the top of the canopy and below the canopy. Spray penetration to the canopy top and through the canopy was highly dependent on the relative intensity of mechanically generated turbulence (due to wind across a rough surface) to that of thermally generated turbulence (due to warm air rising) in the unstable roughness sublayer above the canopy. In conditions with mechanical turbulence dominant, termed mixed convection conditions (u* > 1 m s-1 and -0.01 > Ri > -1), the amount and consistency of material reaching the canopy top was higher than during periods with thermal turbulence dominant, termed free convection conditions (u* < 1 m s-1 and Ri < -1). A greater proportion of the material penetrated through the canopy in the free convection conditions. The relationship of the structure of the Reynolds stress in the roughness sublayer to the spray behavior is discussed. For. Sci. 42(1):93-101.

Keywords: Bacillus thuringiensis; aerosols; deposition; meteorology

Document Type: Journal Article

Affiliations: Project Manager at the USDA Forest Service, National Forest Health Center, Morgantown, WV

Publication date: 1996-02-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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