VIC Vegetation Parameter File
Vegetation parameters needed for the different VIC model set-ups are listed below. Number of vegetation tiles and fraction of grid cell covered must be defined for each grid cell.
Vegetation Parameter File Format
|
Variable Name |
Units |
Description |
|
N/A |
Grid cell number |
|
|
Nveg |
N/A |
Number of vegetation tiles in the grid cell |
Repeats for each vegetation tile in the grid cell:
|
Variable Name |
Units |
Description |
|
veg_class |
N/A |
Vegetation class identification number (reference index to vegetation library) |
|
Cv |
fraction |
Fraction of grid cell covered by vegetation tile |
For each vegetation tile, repeats for each defined root zone:
|
Variable Name |
Units |
Description |
|
root_depth |
m |
Root zone thickness (sum of depths is total depth of root penetration) |
|
root_fract |
fraction |
Fraction of root in the current root zone. |
OPTIONAL - If BLOWING_SNOW is TRUE in global parameter file, then for each vegetation tile, the following parameters must appear after the list of root depth/fract parameters:
|
Variable Name |
Units |
Description |
|
sigma_slope |
N/A |
Standard deviation of terrain slopes within vegetation tile |
|
lag_one |
N/A |
Lag-one autocorrelation of terrain slope within vegetation tile |
|
fetch |
m |
Average fetch (distance the wind blows without obstructions) within vegetation tile |
OPTIONAL - If GLOBAL_LAI is TRUE in global parameter file, then for each vegetation tile, there must be a line containing the following parameters:
|
Variable Name |
Units |
Description |
|
LAI |
N/A |
Leaf Area Index, one per month |
Example Vegetation Parameter File:
### Two vegetation tiles with three root zones in the seventh grid cell
### with LAI included.
7 2
8 0.102679 0.10 0.10 1.00 0.65 0.50 0.25
0.312 0.413 0.413 0.413 0.413 0.488 0.975 1.150 0.625 0.312 0.312 0.312
10 0.897321 0.10 0.10 1.00 0.70 0.50 0.20
0.212 0.262 0.275 0.338 0.750 1.275 0.950 0.650 0.450 0.288 0.237 0.212
VIC Administrator Last modified: Mon Aug 24 09:36:52 PDT 2009