Presenter: Kai-Sheng Chiang
Date: 2015/11/05
Abstract
We use electrical resistivity method and the hydrogeological survey for groundwater recharge estimation in the two different studies site. One site, a portion of an unconfined alluvial aquifer located in the Padana Plain (Italy) was characterized fowling an integrated hydro-geophysical approach. Another site, the place using a technique for the piedmont zone in the Himalayan foothill region, India. In the Italy, an electrical resistivity tomography (ERT) survey was employed to localize the boundaries of a modest paleo-channel body and to design the installation of a groundwater monitoring network. The hydrogeological survey is multilevel slug test to estimate the aquifer’s saturate hydraulic conductivities. In the India, the data used for study are 32 vertical electrical resistivity sounding (VES) measurements at a station interval of 2 km. The hydrogeological survey is tritium tagging studies at six selected sites and pre- and post- monsoon water-level monitoring. The result in a sit specific bi-logarithmic linear relationship in the Italy site, then continuously measured piezometric head were used to calibrate 3D flow model. The result that a well-defined empirical relationship between unsaturated zone resistivity and recharge percent was obtained. The integration of the ERT survey results with the classical hydrogeological test can be conveniently applied to constrain the permeability field during flow model calibration in different places.
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