WndSp2m {FAO56}

Wind Speed at the height 2 m Above Ground Surface

Description

WndSp returns the value of wind speed at the height 2 m above the ground surface.

Usage

WndSp2m(u_z, z, speed = NULL)

Arguments

u_z

Optional. A numeric scalar that denotes the measured wind speed at z m above ground surface [m/s].

z

A numeric scalar that denotes the height of measurement above ground surface [m].

speed

Optional. A character string that denotes the wind speed general class and can be assigned "str" for strong winds, "mod2str" for moderate to strong winds, "lig2mod" for light to moderate winds, and "lig" for light winds.

Details

This is a function to calculate the wind speed [m/s]. If u_z is missing, the function estimate the wind speed based on wind general or empirical classes.

Value

The function returns the value of the wind speed [m/s] as a numeric scalar.

Reference

Allen, R. G., Pereira, L. S., Raes, D., & Smith, M. (1998). Crop evapotranspiration - Guidelines for computing crop water requirements - FAO Irrigation and drainage paper 56. Fao, Rome, 300(9), D05109.

Examples

WndSp2m(u_z = 3.2, z = 10)
WndSp2m(speed = "mod2str")