bigleaf (version 0.8.2)

roughness.length.heat: 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)

Value

Roughness length for heat, z0h (m)

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:

$$z0h = z0m / exp(kB_h)$$

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)