roughness.length.heat: Roughness length for heat

In bigleaf: Physical and Physiological Ecosystem Properties from Eddy Covariance Data

Roughness length for heat

Description

Roughness length for heat (thermal roughness length, z0h) from the kB-1 parameter and roughness length for momentum (z0m).

Usage

roughness.length.heat(z0m, kB_h)

Arguments

z0m	Roughness length for momentum (m)
kB_h	kB-1 parameter for heat transfer

Details

The roughness length for heat (z0h) can be calculated from the following relationship (e.g. Verma 1989):

kB_h = ln(z0m/z0h)

it follows:

z0h = z0m / exp(kB_h)

Value

Roughness length for heat, z0h (m)

Note

If unknown, z0m can be calculated from roughness.parameters. kB_h can be calculated from Gb.Thom, Gb.Choudhury, Gb.Su or aerodynamic.conductance.

References

Verma, S., 1989: Aerodynamic resistances to transfers of heat, mass and momentum. In: Estimation of areal evapotranspiration, IAHS Pub, 177, 13-20.

Rigden, A., Li, D., Salvucci, G., 2018: Dependence of thermal roughness length on friction velocity across land cover types: A synthesis analysis using AmeriFlux data. Agricultural and Forest Meteorology 249, 512-519.

Examples

roughness.length.heat(2,2.5)

bigleaf documentation built on Aug. 22, 2022, 9:09 a.m.