Vegetation parameters

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3.3.2. Vegetation parameters#

LeavesOutInitially#
Requirement:

Optional

Description:

Flag for initial leave status [1 or 0]

Configuration:

If the model run starts in winter when trees are bare, set LeavesOutInitially = 0 and the vegetation parameters will be set accordingly based on the values set in SUEWS_SiteInfo.xlsm. If the model run starts in summer when leaves are fully out, set LeavesOutInitially = 1 and the vegetation parameters will be set accordingly based on the values set in SUEWS_SiteInfo.xlsm. Not LeavesOutInitially can only be set to 0, 1 or -999 (fractional values cannot be used to indicate partial leaf-out). The value of LeavesOutInitially overrides any values provided for the individual vegetation parameters. To prevent LeavesOutInitially from setting the initial conditions, either omit it from the namelist or set to -999. If values are provided individually, they should be consistent the information provided in SUEWS_Veg.txt and the time of year. If values are provided individually, values for all required surfaces must be provided (i.e. specifying only albGrass0 but not albDecTr0 nor albEveTr0 is not permitted).

GDD_1_0#
Requirement:

Optional

Description:

GDD related initial value

Configuration:

Cannot be negative. If leaves are already full, then this should be the same as GDDFull in SUEWS_Veg.txt. If winter, set to 0. It is important that the vegetation characteristics are set correctly (i.e. for the start of the run in summer/winter).

GDD_2_0#
Requirement:

Optional

Description:

GDD related initial value

Configuration:

Cannot be positive If the leaves are full but in early/mid summer then set to 0. If late summer or autumn , this should be a negative value. If leaves are off , then use the values of SDDFull in SUEWS_Veg.txt to guide your minimum value. It is important that the vegetation characteristics are set correctly (i.e. for the start of the run in summer/winter).

LAIinitialEveTr#
Requirement:

Optional

Description:

Initial LAI for evergreen trees EveTr.

Configuration:

The recommended values can be found from SUEWS_Veg.txt

LAIinitialDecTr#
Requirement:

Optional

Description:

Initial LAI for deciduous trees DecTr.

Configuration:

The recommended values can be found from SUEWS_Veg.txt

LAIinitialGrass#
Requirement:

Optional

Description:

Initial LAI for irrigated grass Grass.

Configuration:

The recommended values can be found from SUEWS_Veg.txt

albEveTr0#
Requirement:

Optional

Description:

Albedo of evergreen surface EveTr on day 0 of run

Configuration:

The recommended values can be found from SUEWS_Veg.txt

albDecTr0#
Requirement:

Optional

Description:

Albedo of deciduous surface DecTr on day 0 of run

Configuration:

The recommended values can be found from SUEWS_Veg.txt

albGrass0#
Requirement:

Optional

Description:

Albedo of grass surface Grass on day 0 of run

Configuration:

The recommended values can be found from SUEWS_Veg.txt

decidCap0#
Requirement:

Optional

Description:

Storage capacity of deciduous surface DecTr on day 0 of run.

Configuration:

The recommended values can be found from SUEWS_Veg.txt

porosity0#
Requirement:

Optional

Description:

Porosity of deciduous vegetation on day 0 of run.

Configuration:

This varies between 0.2 (leaf-on) and 0.6 (leaf-off). The recommended values can be found from SUEWS_Veg.txt