PEST - parameter estimation for any model

PEST Utilities for MODFLOW and MT3D Calibration. . .

The PEST MODFLOW/MT3D Utilities are a set of programs which automate construction of PEST interface files for use with MODFLOW and MT3D. Also provided are programs which interpolate MODFLOW and MT3D unformatted output files to borehole locations for direct comparison with field measurements.

The PEST MODFLOW/MT3D Utilities can be used with any version of MODFLOW or MT3D supplied by any vendor. They can never become outdated as MODFLOW and MT3D continue to be upgraded because PEST operation is independent of the model it calibrates.

The Utilities are designed to facilitate calibration of MODFLOW against borehole-measured heads and/or drawdowns, and MT3D against borehole-measured concentrations. However, because of the open-ended nature of the PEST-model interface, this can be extended according to the demands of any particular modeling problem.

Adjustable parameters can include just about anything found on a MODFLOW or MT3D input file including tabulated data such as drain and riverbed conductance as well as array-based data such as transmissivity, recharge and dispersivity. Using PEST to calibrate MODFLOW and MT3D has the added advantage that once you own PEST, you can use it to calibrate your other models as well.
 

PEST Utilities for GMS. . .

The PEST GMS Utilities are a set of programs which facilitate the use of PEST in the GMS environment. They are designed to enhance the model calibration functionality already built into GMS by automating construction of PEST input files based on the contents of observation coverages accessed through the GMS Map module (versions 2.1 and later).

At present, the PEST GMS utilities consist of four programs. These are:

PMODFLOW
PEST's PMODFLOW is a modification of the version of MODFLOW supplied with GMS. It retains all of the functionality of that version of MODFLOW. However it is also able to read a GMS map file. It searches for the presence of any observation coverages present in a map file and then spatially and temporally interpolates MODFLOW results to the locations and times of measurements cited in those observation coverages.

PSETUP
PEST's PSETUP also reads a GMS map file containing one or more observation coverages. It automatically generates two PEST input files via a PEST control file and a PEST instruction file. The control file cites all measurements found in the map file and provides them with weights calculated in accordance with uncertainty levels as previously provided to GMS. The instruction file reads a PMODFLOW output file in which the MODFLOW-generated equivalents to the field measurements are listed.

TEXTREP
PEST's TEXTREP assists in the construction of PEST template files from model input files such as MODFLOW input files that can consist of thousands of numbers arranged in arrays.

PARREP
A program that replaces parameter values found in a PEST control file with those found in a PEST parameter value file. Use of PEST PARREP makes it easy to start one PEST run where another left off.

The PEST-GMS Utilities are free! Please contact us if you want to download a copy.

PEST Requirements: PC or UNIX Workstation.

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