VIC Classic——Vegetation Parameter File_partial vegetation cover fraction-优快云博客

不同VIC模型设置所需的植被参数如下表所示。植被瓦片的数量和每个网格单元的面积比需要在每个网格单元中指定。

植被参数文件格式

Variable Name	Units	Description
gridcel	N/A	Grid cell number
Nveg	N/A	Number of vegetation tiles in the grid cell

每个网格单元中每个植被瓦片重复：

Variable Name	Units	Description
veg_class	N/A	Vegetation class identification number (reference index to vegetation library) NOTE 1: it is common practice to define only one tile for each vegetation class in the grid cell. But this is not strictly necessary. It is OK to define multiple tiles having the same vegetation class. NOTE 2: As of VIC 4.1.1, if you are simulating lakes, you MUST designate one of the tiles from each grid cell as the tile that contains the lake(s). This designation happens in the lake parameter file. You can either choose an existing tile to host the lakes, or insert a new tile (just make sure that the sum of the tile areas in the grid cell = 1.0). This extra lake/wetland tile may have the same vegetation class as one of the other existing tiles (see NOTE 1).
Cv	fraction	Fraction of grid cell covered by vegetation tile

每个植被瓦片，每种定义的根区重复：

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.

可选项：如果global parameter file中BLOWING_SNOW值为TRUE，那么对于每个植被瓦片，那么在植根深度/比例参数之后需要加入下面这些参数：

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

可选项：在global parameter file中VEGPARAM_LAI值为TRUE，那么每个植被瓦片，有一行需包含如下参数：

Variable Name	Units	Description
LAI	fraction	Leaf Area Index, one per month

可选项：若global parameter file文件中VEGPARAM_FCAN值为TRUE，那么每个植被瓦片，必有一行包含如下参数：

Variable Name	Units	Description
FCANOPY	fraction	Partial vegetation cover fraction, one per month

可选项：若global parameter file中VEGPARAM_ALBEDO值为TRUE，那么每个植被瓦片，必有一行包含如下参数：

Variable Name	Units	Description
ALBEDO	fraction	Albedo, one per month

植被参数文件示例：

### 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