Name

Default

Unit

Symbol

Comments/Explanations

DayNumber

120

#

t_day(i)

Governs the variation of all the parameters in the table below.

Roughness Length

0.01

m

z₀

Roughness length. The value of the roughness length can be estimated from the stand height. A well-known relation says 1/10 of stand height.

Displace         

0.01

m

d

Displacement height of vegetation cover. The value can as a rule of thumb be put to 70% of the stand height. For short crops the displacement will be close to zero.

Resistance Surface

100

s/m

r_s

Surface resistance. The surface resistance can be estimated by fitting techniques or found from micrometeorological measurements. Forest surface resistance will be found in a range from 100-300, whereas crops is in the range 20-70 s/m.

AlbedoV         

25

%

a_veg

Albedo of vegetation. This parameter can optionally be defined in the section Description of Plant.

CanopyHeight

1

m

H_p

Height of canopy optionally used to estimate roughness length by using the equation originating from Shaw and Pereira (1982). This parameter can optionally be defined in the section Description of Plant.