bigleaf (version 0.7.0)

Reynolds.Number: 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)

Value

Re -

Roughness Reynolds Number (-)

Details

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

$$Re = z0m * ustar / v$$

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

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

# NOT RUN {
Reynolds.Number(25,100,0.5,z0m=0.5)                             

# }