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.
|Journal||Environmental Modelling and Software|
|Publication status||Accepted/In press - 14 Aug 2021|
- Multiphysics modelling
- Coupled inversion
- Uncertainty analysis