People

Post Doctoral Fellow	René van Hout
Graduate Student	Weihong Zhu Luksa Luznik
Project Supervisors	Prof. Joseph Katz
Design and Technical Support	Yury Ronzhes Stephen King

Outline

Field experiments were carried out from the 3rd of July 2003 until the 23rd of July near Hurlock on the Eastern Shore of the Chesapeake Bay in Maryland. The field experiment was carried out in the center of a circular irrigated field of which half of the circle was planted with corn (120 acres). The other half was planted with potatoes.

Exact location of the field site is shown below.

The aim of the measurements is to determine the distance corn pollen grains are dispersed by wind. Planar PIV measurements were carried out just above and within the corn canopy. Smoke was used as tracer particles.

Experimental Setup

Results

Mean wind velocity (5 min. averages of streamwise component) obtained from PIV images (Runs 61 to 65) is compared to data obtained from Sonic anemometers and Young propellor windvane at different heights above the ground.

Mean Velocity profiles of the streamwise component as a function
of height are compared to profiles found in the literature.

Convergence of rms of u’,w’ and u’w’

Images

Pollen Images

Publications

van Hout, R., Zhu, W., Luznik, L., Katz, J. (2004) PIV measurements of atmospheric turbulence above and within a corn canopy. To be presented at the APS Division of Fluid Dynamics 57th Annual Meeting , 21-23 November, Seattle, WA, USA.

Zhu, W., Luznik, L., van Hout, R., Katz, J., (2004) PIV measurements of atmospheric turbulence above and within a corn canopy. Presented at the AMS meeting, 16th Symposium on Boundary Layers and Turbulence, 9-13 August, Portland, ME, USA.

Zhu, W., Luznik, L., van Hout, R., Katz, J., (2003) PIV measurements of atmospheric turbulence and pollen dispersal above a corn canopy. AGU Fall meeting, 8-12 December, Moscone Center West, San Francisco