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The Influence of Turbulence on Particle Trajectory and Deposition in a Forest Canopy

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2007 ASAE Annual Meeting  071034.(doi:10.13031/2013.23359)
Authors:   Milton E Teske, Harold W Thistle
Keywords:   Canopy penetration, turbulence, interception, attenuation

Deposition measurements taken through a young radiata pine plantation in Kaingaroa Forest, North Island, NZ, suggest that approximately 50 percent of the spray attenuation occurs within the top 35 percent of the canopy. This result contrasts to the modeling predictions from AGDISP, which predict that only 20 percent of the spray material will be captured in the top portion of the canopy. These data therefore provide the means whereby the existing canopy interception model can be re-examined, modified, and validated. Since canopy penetration depends on the length of passage of the particle through the canopy, and atmospheric turbulence increases the length of droplet trajectories, especially of droplets with small diameters, any increase in passage length will result in a greater likelihood of the material being attenuated through the canopy. This paper explores canopy modeling in light of the extensive numerical and experimental work undertaken in the last 15 years, and the implications of what are thought now to be the effects of turbulent processes near the top of the canopy.

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