Surface wind structure in forest clearings during a chinook

TitleSurface wind structure in forest clearings during a chinook
Publication TypeConference Proceedings
Year of Conference1980
AuthorsSwanson, R. H.
Conference Name48th Annual Western Snow Conference
Series TitleProceedings of the 48th Annual Western Snow Conference
Date PublishedApril 1980
PublisherWestern Snow Conference
Conference LocationLaramie, Wyoming
KeywordsClearcuts, Forest climatology, Forest hydrology, Wind profiles

During a chinook wind period, 5-8 April 1979, horizontal wind speed and its vertical component at 2 m height were measured in 12 circular 1 to 6 tree height diameter clearings in 20 m tall lodgepole pine forest in Alberta. These values are compared with horizontal wind speed in the centre of a 400 X 400 m clearcut and at 10 m above the tree canopy. Wind speed in all of the small circular clearings averaged about 1/20 of that above the canopy; that in the square clearcut was approximately equal. Vertical motion in 4 and 6 tree height clearings was 4 X that in the smaller ones.