Download ParFlow User`s Manual - Inside Mines

106
CHAPTER 6. PARFLOW FILES
The various possible functions are defined as follows. The Constant specification means that the relative
permeability will be constant on the specified geounit. The VanGenuchten specification means that the
relative permeability will be given as a Van Genuchten function [62] with the form,
kr (p) =
(αp)n−1
2
(1+(αp)n )m )
,
+ (αp)n )m/2
(1 −
(1
(6.1)
where α and n are soil parameters and m = 1 − 1/n, on each region. The Haverkamp specification means
that the relative permeability will be given in the following form [22],
kr (p) =
A
,
A + pγ
(6.2)
where A and γ are soil parameters, on each region. The Data specification is currently unsupported but will
later mean that data points for the relative permeability curve will be given and ParFlow will set up the
proper interpolation coefficients to get values between the given data points. The Polynomial specification
defines a polynomial relative permeability function for each region of the form,
kr (p) =
degree
X
c i pi .
(6.3)
i=0
list
Phase.RelPerm.GeomNames
[no default]
This key specifies the geometries on which relative permeability will be given. The union of these
geometries must cover the entire computational domain.
Example Useage:
pfset Phase.RelPerm.Geonames
domain
double
Geom.geom name.RelPerm.Value
[no default]
This key specifies the constant relative permeability value on the specified geometry.
Example Useage:
pfset Geom.domain.RelPerm.Value
0.5
integer
Phase.RelPerm.VanGenuchten.File
[0]
This key specifies whether soil parameters for the VanGenuchten function are specified in a pfb file or by
region. The options are either 0 for specification by region, or 1 for specification in a file. Note that either
all parameters are specified in files (each has their own input file) or none are specified by files. Parameters
specified by files are: α and N.
Example Useage:
pfset Phase.RelPerm.VanGenuchten.File
1
string
Geom.geom name.RelPerm.Alpha.Filename
[no default]
This key specifies a pfb filename containing the alpha parameters for the VanGenuchten function cellby-cell. The ONLY option for geom name is “domain”.
Example Useage:
pfset Geom.domain.RelPerm.Alpha.Filename
alphas.pfb