Vertical Profiles of Windspeed in a Pine Stand
Simultaneous measurements of windspeed were made at six heights extending to the top of a lodgepole pine stand. These profiles were measured in simultaneous pairs, using movable masts at a number of points between trees. Associated windspeeds and air temperatures were measured at three levels above the canopy at a fixed location, together with above-canopy wind direction. The data indicate that, for a given wind direction and position in the stand, the windspeed profile expressed as a fraction of the friction velocity above the stand is invariant for a relatively wide range of windspeeds above the canopy. These scaled profiles are combined to form an average local maximum speed profile for the stand. Both point profiles and the combined profile show a minimum in the live crown and a subcanopy maximum. Average differences between simultaneous profiles were about 10 percent below the live canopy and 20 percent in the low-speed canopy region. Forest Sci. 17:314-321.
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Document Type: Journal Article
Affiliations: Meteorologist, Rocky Mountain Forest and Range Exp. Sta., Forest Service, USDA, Fort Collins, Colo. 80521
Publication date: 1971-09-01
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