WindspeedHellmann {wflo}

Scales wind speeds to certain heights.

Description

For a wind speed at given height, returns a scaled wind speed at some different height. Often used to obtain wind speed at hub height.

Usage

WindspeedHellmann(v0, HH = 100, refHeight = 10, alpha = 1 / 7)

Arguments

v0

wind speed (in meters per second) at reference height.

HH

the height (in meters) at which wind speed is desired.

refHeight

reference height (in meters). The height at which the actual wind speed (v0) was measured.

alpha

power law parameter. Usually set to 1/7 for onshore sites.

Details

This function simply implements

v = v_0 (\frac{HH}{refHeight})^{\alpha}

Value

WindspeedHellmann returns a wind speed (in meters per second) at the desired height.

Author(s)

Carsten Croonenbroeck

See Also

WindspeedLog for a different way to scale wind speeds to heights.

Examples

WindspeedLog(v0 = 6, HH = 80, z0 = 0.1, refHeight = 20)
WindspeedHellmann(v0 = 6, HH = 80, refHeight = 20)