CHARACTERIZATION OF SUBSURFACE THROUGH JOINT HYDROGEOLOGICAL AND HYDROGEOPHYSICAL MODELS

The characterization of the subsurface heterogeneity and the monitoring of the dynamics of groundwater are of paramount importance for protection of groundwater quality, design and check of the effectiveness of remediation plans. Invasive direct tools, mostly based on the drilling of piezometers and boreholes, geotechnical and geognostic surveys often provide information with accurate vertical resolution, but require horizontal interpolation or correlation. Hydrogeophysics provides a useful complementary technique, both for hydrostratigraphic characterization and for monitoring. Some attempts of joint inversion of geophysical and hydraulic data have been proposed (Fowler and Moysey 2011; Hinnel et al. 2010; Jardani et al. 2013; Lochbuehler et al. 2013; Pollok and Cirpka 2010; Straface et al. 2011). The goal of this paper is to describe an interpretative tool that profits from DC geoelectrical and hydraulic collected data, which are used in a joint modeling of hydrogeological and geophysical processes for the application of an approach similar to the Kalman filter (Kalman 1960; Evensen 2009).