4.3.2. 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