✦ LIBER ✦

The effect of rainfall on measurements of mean wind speed with cup anemometers in the surface layer at sea

✍ Scribed by Frank-Ulrich Dentler

Publisher: Springer
Year: 1978
Tongue: English
Weight: 368 KB
Volume: 14
Category: Article
ISSN: 0006-8314
DOI: 10.1007/bf00123993

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✦ Synopsis

A mathematical model is developed to estimate rain-induced errors in cup anemometer readings. Based upon a two-cup hemispheric model, the indicated wind speed is calculated for a given true wind speed, fall velocities of the drops, and a general drop-size distribution.

The results of these computations show that the effect of rainfall is small as expected. The influence on derived profiles of mean wind speed is rather a displacement of the profile to lower velocities than a change in the slope of the profile.

The magnitude of these errors is a few percent or less even for heavy rainfall.

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## Abstract A monolayer on a water surface is affected by the action of wind, and retracts until the wind drag is counter‐balanced by the opposing surface pressure gradient. This effect has been used to determine the shearing stress on water at low wind speeds. Estimates of the drag coefficient hav