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iMOD User Manual version 5.2 (html)


10.19Data Set 18: Parameter Estimation - Parameters

Data Set
18

PACT,PPARAM,PILS,PIZONE,PINI,PDELTA,PMIN,PMAX,PINCREASE,
PIGROUP,PLOG,PACRONYM,POSTERIOR

PACT

Activation of the current parameter.

0

Parameter is not adjusted, initial parameter value PINI remains unchanged during the estimation

1

Parameter is part of the estimation process

PPARAM

Parameter type, choose from:

Type

Transf.

KD

LOG

Transmissivity, equal to KDW

KH

LOG

Horizontal permeability, equal to KHV

KV

LOG

Vertical permeability, equal to KVV

VC

LOG

Vertical resistance, equal to VCW

SC

LOG

Storage coefficient equal to STO

SY

LOG

Specific Yield for unconfined simulations

RC

LOG

River conductance as mentioned in RIV

RL

-

River stage level as mentioned in RIV

RB

-

River bottom level as mentioned in RIV

RI

LOG

River infiltration factor as mentioned in RIV

DC

LOG

Drainage conductance as mentioned in DRN

DL

-

Drainage level as mentioned in DRN

IC

LOG

River conductance as mentioned in an ISG file

II

LOG

River infiltration factor as mentioned in an ISG file

IL

-

River stage level as mentioned in an ISG file

IB

-

River bottom level as mentioned in an ISG file

AH

-

Angle of Anisotropy

AF

LOG

Factor of Anisotropy

VA

LOG

Vertical Anisotropy

HF

LOG

Horizontal Barrier Factor

MS

LOG

MetaSWAP storage coefficient (Theta)

MC

LOG

MetaSWAP conductance (k)

RE

-

Recharge

EX

LOG

External parameter, specify on the next line the batch file that need to be executed to modify any parameter.

EP

LOG

Corey-Epsilon parameter for the UZF package.

QR

-

Rate for extraction wells.

MQ

-

Rate for a multinode well.

PILS

Enter the layer number or system number for the parameter PPARAM. In case KD,KH,KV,C,S,AH,AF,VA,EP are used apply a model layer number, for the other parameters apply the system number.

PIZONE

Enter the zone number (integer value) for which the parameter PPARAM need to be adjusted. For the parameter type HF this is irrelevant since all lines from the HF module will be optimized together, not differentiation can be made along the line within the same system. You should enter a value but it will not be used!

PINI

Enter the initial multiplication factor for the parameter PPARAM.

PDELTA

Enter the step size to be used for the sensitivity computation. PDELTA should be larger than 1.0

PMIN

Enter the minimum multiplication factor for the parameter PPARAM that might be applied during the optimization.

PMAX

Enter the maximum multiplication factor for the parameter PPARAM that might be applied during the optimization.

PINCREASE

Enter the maximum increase of the parameter factor.

PIGROUP

Enter the group number to which the parameters belongs, parameters within the same group will be estimated simultaneously.

PLOG

Enter whether the parameter need to be log transformed, e.g. set PLOG=1 to log transform the parameter, set PLOG=0 to use a linear relation. By default the settings will be applied as described by the PPARAM keyword.

PACRONYM

Enter the name of the (set of) parameter(s). This acronym is used in the logging of results for each parameter. The size is maximal 15 characters, in case empty spaces are used, apply brackets “…”.

POSTERIOR

Enter the posterior values of the variable. This is used whenever the Tikhonov Regularisation is active.