Reynolds.Number {bigleaf}

Roughness Reynolds Number

Description

calculates the Roughness Reynolds Number.

Usage

Reynolds.Number(Tair, pressure, ustar, z0m, constants = bigleaf.constants())

Arguments

Tair

Air temperature (deg C)

pressure

Atmospheric pressure (kPa)

ustar

Friction velocity (m s-1)

z0m

Roughness length (m)

constants

Kelvin - conversion degree Celsius to Kelvin
pressure0 - reference atmospheric pressure at sea level (Pa)
Tair0 - reference air temperature (K)

Details

The Roughness Reynolds Number is calculated as in Massman 1999a:

Re = z0m * ustar / v

where v is the kinematic viscosity (m2 s-1).

Value

Re -

Roughness Reynolds Number (-)

References

Massman, W.J., 1999a: A model study of kB H- 1 for vegetated surfaces using 'localized near-field' Lagrangian theory. Journal of Hydrology 223, 27-43.

Examples

Reynolds.Number(25,100,0.5,z0m=0.5)