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Wind profiles over hills (in relation to wind-power utilization)

✍ Scribed by J. Frenkiel

Publisher
John Wiley and Sons
Year
1962
Tongue
English
Weight
857 KB
Volume
88
Category
Article
ISSN
0035-9009

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✦ Synopsis

Abstract

Following a previous country‐wide wind survey, two sites – each typical of one of the following two topographical categories: (a) a hill forming a part of a mountain ridge athwart the prevailing wind direction with steep leeward slopes, and (b) an isolated peak in a valley in the general direction of prevailing winds – were chosen for detailed investigation of wind behaviour with the purpose of correlating the characteristics of the wind flow over the hill to its topography. At each site, wind vertical gradient, wind direction, and temperature vertical gradient were measured in the height interval of interest to wind‐power utilization (10 m to 40 m above the hilltop) for a period of about a year.

These measurements have shown:

There is no close relationship between mean wind profile and mean temperature profile over hills.

Whilst the directional wind profiles are practically uninfluenced by wind speed, they are largely determined by: (a) the hill profile in the immediate neighbourhood of the site of measurements, and (b) the hill profile further upwind in relation to that near the measurements site.

The effect of thermal stratification is important for all wind speeds with the curves of wind ratio as a function of temperature gradient exhibiting a both minimum and a maximum, the location of which on the scale of temperature gradient depending on the hill profile.

A classification of wind‐power sites is given based on a single criterion, i.e., mean wind vertical gradient for the height interval from 10 m to 40 m. For optimal conditions for wind‐power utilization this gradient must vanish, a flow condition resulting from: (a) small hilltop area; (b) regular and smooth slopes of about 1 in 3 1/2 in the nearest few hundred metres from the hilltop.

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