A shelter belt study—Relative shelter, effective winds and maximum efficiency
✍ Scribed by W.H. Hogg
- Publisher
- Elsevier Science
- Year
- 1965
- Weight
- 391 KB
- Volume
- 2
- Category
- Article
- ISSN
- 0002-1571
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✦ Synopsis
Daily run-of-wind measurements were made for 3 years at distances of 3a/2 h and 7 h to leeward of a 7-row shelter belt about 6 m high. After elimination of variations in wind direction, the monthly values of relative shelter at these positions showed no evidence of an increase with time. The variations in wind direction were eliminated by regressions of monthly values of relative shelter on the monthly percentage frequency of effective winds, i.e., winds from the normal windward side of the shelter belt. Using these regressions the maximum efficiency of the belt at 3a/2 h was found to be 61 ~, and at 7 h it was 40% It is suggested that such values may be used as objective indices of the degree of shelter provided at a fixed point.