How to determine your wind instruments optimum heights?

Wind speed increases considerably with height, particularly over rough terrain.

For this particular reason, the exposure of wind instruments has been defined to a standard height of 10m above open terrain.

Sensors should be kept away from local obstructions as much as possible.

When wind instruments are placed on top of a building, they should be raised at least one building width above the top.

determine wind instruments optimum heights

Finding an optimum height for your wind instruments

Wind instruments should be mounted at a high point with minimum wind obstruction. If mounted on a light pole, consideration should be taken to place sensor so obstruction is in the lowest wind direction.

The standard exposure of wind instruments over open level terrain is 10 m above the ground. Open terrain is defined as an area where the distance between the anemometer and any obstruction is at least 10 times the height of the obstruction.

In practice, it is often difficult to find a good or even acceptable location for a wind station. For terrain that is uneven, contains obstacles, or is non-homogeneous in surface cover, both wind speed and direction can be affected considerably. In any case, corrections are often possible and available.

When wind measurements are taken on the side of tower masts rather than at their top, the instruments should be placed on booms with a length of at least three mast or tower widths.

Wind measurement in complex locations

In freezing weather, special precautions must be taken to keep the wind sensors free from sleet and ice accumulations. It may be required to provide artificial heating for the exposed parts and specific types of equipment may be preferred.

When wind measurement is required at different heights, larger towers can be erected with multiple anemometers and weather instruments mounted at varying heights to collect data.