Air Flow Through a Deciduous Forest Edge Using High Frequency Anemometry
Abstract
The air flow field through a deciduous forest edge was measured. Measurement was accomplished using orthogonal hot-film anemometers coupled with a direction sensor. This measurement system is called a TFWOES (Triple Film, Wind Octant Electronic Sensor). High frequency temperature data was also collected. Measurements are presented primarily for near-neutral conditions and indicate the role of foliage and the edge on this flow field. The edge displaces the mean flow upward but also acts as a longitudinal momentum source in the foliage in edge fetch flows. This flow is extremely complex with highest turbulent intensities in the trunk space. Spectral analysis indicates that there is increased spectral density here at length scales possibly corresponding to the height of the edge, local terrain and canopy elements. Comparison of the foliated and unfoliated flows indicates that the air is less effective penetrating the foliated canopy because of increased drag but that the relationship between foliage density and drag coefficient is complicated. Keywords: Air flow; Deciduous forest; Sensors; Foliage; Turbulence; Foliated canopys; Terrain; Canopy elements.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1988
- Accession Number
- ADA198566
Entities
People
- D. R. Miller
- Harold W. Thistle Jr.
- J. D. Lin
Organizations
- University of Connecticut