Calibration and Reliability in Groundwater
Modelling: Credibility of Modelling
(Proceedings of ModelCARE 2007 Conference, held in
Denmark, September 2007). IAHS Publ. 320, 2008, 148-153.
Calibrating
unsaturated model parameters using electrical resistivity tomography imaging
F. SLAMA1, E. P. Milnes2
& R. Bouhlila1
1 Laboratoire
de Modˇlisation en Hydraulique et Environnement, Ecole Nationale dÕIngˇnieurs
de Tunis,
BP 37 Le Belvˇd¸re 1002, Tunis, Tunisie
2 Centre of Hydrogeology CHYN,
University of Neuch‰tel, 11, rue Emile-Argand, CH-2007 Neuch‰tel, Switzerland
Abstract Successive
electrical resistivity tomography (ERT) measurements were performed during a
controlled infiltration test. Thirty-two electrodes were used with a spacing of
1 m leading to an investigation depth of about 5 m. Four ERT profiles were
performed during the infiltration test, each with a time-lapse of one hour.
Water, with an electrical conductivity of 9.53 mS cm-1, was
infiltrated into a furrow with a constant flux of 0.75 L s-1 for 4
hours. The resistivity difference between the reference and each ERT profiles
were computed and mapped to estimate the plume evolution in time. Hydrus2D was
used to simulate water flow during the infiltration test and Van GenuchtenÕs
soil hydraulic parameters model were calibrated on the measured ERT data set.
Key words unsaturated model; ERT imaging; infiltration test; Van GenuchtenÕs parameters