Model Partner Software

GMDSI sees strategic use of model partner software as essential to decision-support modelling. Two specifications are fundamental to model partner software. They are:

  • a non-intrusive interface with the model
  • an ability to parallelize model runs.

The PEST and PEST++ suites have these specifications, and GMDSI’s research and worked example work will make heavy use of them.

GMDSI recognizes that there are two major obstacles to widespread use of model partner software by the groundwater industry at large:

  • lack of understanding of the tasks performed by this software, and of the theory behind these tasks
  • difficulties in constructing input datasets for this software, especially in contexts where parameters are many and observation numbers are large.

GMDSI is addressing the former through engagement and education, and the latter through targeted software development, in particular by sponsoring improvements to software which supports the use of PEST and PEST++ as follows:

  • Pilot point parameterisation of groundwater models has been improved. So too has regularisation and random number generation associated with their use.
  • PLPROC, the parameter list processor supplied with the PEST suite, can now employ pilot points for parameterisation of polylinear boundary conditions. Functionality has also been added which allows more easy use of PLPROC with the MODFLOW 6 simulator.
  • A new utility program named TS6PROC allows parameter-based manipulation of time series contained in MODFLOW 6 time series files.
  • A utility named OLPROC will soon automate construction of PEST and PEST++ input datasets while supporting use of complex, multi-component objective functions that involve observations and observation differences.

All of this software will be downloadable for free from the PEST web pages.

In addition, enhancements and additions will be made to PEST, PEST_HP and other members of the PEST suite on an as-needed basis to support GMDSI research and worked example work. These will be made available to the industry at large through the PEST web pages.

Other Software

A simple, lumped parameter recharge model named LUMPREM, with linkages to MODFLOW, will soon be available from the PEST web pages.

GMDSI is exploring the possibility of collaborating with the USGS personnel to improve MODFLOW 6 performance in areas where near-surface hydraulic properties vary vertically. This will be accomplished without the need to add extra layers to a model and is expected to be an attractive option in simulating the regional impact of mining. Faster run times and increased numerical stability will facilitate data assimilation and uncertainty analysis.

Banner photo: BHP