Hydrogeophysical model calibration and uncertainty analysis via full integration of PEST/PEST++ and COMSOL

Andres Gonzalez Quiros* (Corresponding Author), Jean-Christophe Comte

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The calibration of groundwater models is frequently limited by the lack of direct hydrogeological data. Non-intrusive geophysical methods are increasingly used to provide higher spatio-temporal resolution datasets for identification of hydrological processes and estimation of hydraulic properties. In groundwater model calibration performed through joint or coupled hydrogeophysical inversion the hydrogeological datasets are supplemented with auxiliary geophysical data. To perform a coupled inversion of real-world models both, a coupled multiphysical forward model and an inversion methodology, are required. In this work we propose a methodological approach to perform coupled inversion by integrating the calibration software PEST/PEST++ with COMSOL Multiphysics using MATLAB. The strategy provides multiple options for calibration and uncertainty analysis relevant for a broad range of environmental models. To illustrate the approach, we show a hydrogeophysical application in which electrical resistivity is jointly used with borehole data for the identification of seawater intrusion in a coastal aquifer.
Original languageEnglish
JournalEnvironmental Modelling and Software
Publication statusAccepted/In press - 14 Aug 2021

Keywords

  • Hydrogeophysics
  • Multiphysics modelling
  • Coupled inversion
  • Uncertainty analysis

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