VIC Vegetation Library File

Column

Variable Name

Units

Number of Values

Description

1

veg_class

N/A

 1

Vegetation class identification number (reference index for library table)

2

overstory

N/A

 1

Flag to indicate whether or not the current vegetation type has an overstory (TRUE for overstory present [e.g. trees], FALSE for overstory not present [e.g. grass])

3

rarc

s/m

 1

Architectural resistance of vegetation type (~2 s/m)

4

rmin

s/m

 1

Minimum stomatal resistance of vegetation type (~100 s/m)

5 : 16

LAI

12

Leaf-area index of vegetation type

17 : 28

albedo

fraction

12

Shortwave albedo for vegetation type

29 : 40

rough

m

12

Vegetation roughness length (typically 0.123 * vegetation height)

41 : 52

displacement

m

12

Vegetation displacement height (typically 0.67 * vegetation height)

53

wind_h

m

1

Height at which wind speed is measured. If using snow interception routines please read the information page

54

RGL

W/m^2

1

Minimum incoming shortwave radiation at which there will be transpiration. For trees this is about 30 W/m^2, for crops about 100 W/m^2.

55

rad_atten

fract

1

Radiation attenuation factor. Normally set to 0.5, though may need to be adjusted for high latitudes.

56

wind_atten

fract

1

Wind speed attenuation through the overstory. The default value has been 0.5.

57

trunk_ratio

fract

1

Ratio of total tree height that is trunk (no branches). The default value has been 0.2.

58

comment

N/A

1

Comment block for vegetation type. Model skips end of line so spaces are valid entrys.