wind: Downscales wind

In ilyamaclean/microclimf: Fast above, below or within canopy gridded microclimate modelling with R

Downscales wind

Description

The function 'wind' downscales wind speed accounting for vegetation and terrain

Usage

wind(micro, reqhgt = 0.05, pai_a = NA, tfact = 1.5)

Arguments

micro	object of class microin as returned by [modelin()]
reqhgt	height above ground for which wind speeds are wanted. If negative (below ground) wind friction velocity only is returned
pai_a	plant area index above 'reqhgt'. Determined from total 'pai' if not supplied.
tfact	coefficient determining sensitivity of soil moisture to variation in topographic wetness (see [soilmdistribute()])

Details

In downscaling wind, two processes are accounted for. Firstly the drag effects of vegetation on wind , which ultimately dictate the wind height profile. Secondly, the effects of local vegetation and terrain on wind speed. Terrain effects are calculated by applying the topographic shelter coefficient described in Maclean et al (2019) Methods in Ecology and Evolution, 10:280-290.

Value

an object of class microin with the following components added:

uf

wind friction velocity (m/s)

uz

if 'reqhgt > 0' wind speed at height 'reqhgt' (m/s)

gHa

convective conductance (mol/m^2/s)

ilyamaclean/microclimf documentation built on Sept. 28, 2024, 4:55 p.m.