HR: 08:40h
AN: H21G-03 INVITED     [Abstracts]
TI: 4D Geoelectrical Tomography for Hydrogeological Applications: Lab-scale and Field Experiments in Southern Apennine Chain (Italy).
AU: * Lapenna, V
EM: lapenna@imaa.cnr.it
AF: Ist. di Metodologie per l'Analisi Ambientale, C.da S. Loja, Tito Scalo, Tito, I-85050 Italy
AU: Greco, M
EM: mgreco@unibas.it
AF: Dip. di Ingegneria e Fisica dell'Ambiente, Universita' degli Studi della Basilicata, Campus Macchia Romana, Potenza, I-85100 Italy
AU: Marchese, D
EM: marchese@imaa.cnr.it
AF: Ist. di Metodologie per l'Analisi Ambientale, C.da S. Loja, Tito Scalo, Tito, I-85050 Italy
AU: Colangelo, G
EM: colangelo@imaa.cnr.it
AF: Ist. di Metodologie per l'Analisi Ambientale, C.da S. Loja, Tito Scalo, Tito, I-85050 Italy
AU: Perrone, A
EM: perrone@imaa.cnr.it
AF: Dip. di Ingegneria e Fisica dell'Ambiente, Universita' degli Studi della Basilicata, Campus Macchia Romana, Potenza, I-85100 Italy
AU: Rizzo, E
EM: rizzo@imaa.cnr.it
AF: Ist. di Metodologie per l'Analisi Ambientale, C.da S. Loja, Tito Scalo, Tito, I-85050 Italy
AU: Telesca, V
EM: telesca@unibas.it
AF: Dip. di Ingegneria e Fisica dell'Ambiente, Universita' degli Studi della Basilicata, Campus Macchia Romana, Potenza, I-85100 Italy
AB: Electrical Resistivity and Self-Potential tomographic techniques have been recently employed as low-cost and powerful tools for a wide spectra of geological and environmental applications. In the frame of a national project mainly devoted to apply new and emerging electromagnetic technologies for hydrogeological hazard monitoring, we focused our attention on the 4D geoelectrical tomography. The time-lapse analysis of high-resolution electrical images of near-surface can give a relevant contribute for describing the complex processes related to water movements in the vadose zone. Active (resistivity) and passive (self-potential) geoelectrical measurements have been carried out in both field and lab-scale conditions. The field experiments have been planned for studying the shallow water fluxes in landslide areas located on Southern Apennine chain. The controlled experiments were performed by using a sand box (6.0 x 4.0 x 2.0 meters) which allows to reproduce a medium-large scale natural environment. Electrical resistivity and self-potential data were recorded continuously by using unpolarizable electrodes connected to a multiplexed high impedance and resolution data-logger. Novel tomographic techniques have been applied for obtaining time series of high resolution electrical images during water infiltration experiments under controlled conditions. A full exploitation and analysis of data coming from lab-scale experiments are presented and discussed. Finally, the possible implications of laboratory results with the interpretation of geophysical field experiments in landslide areas are analysed.
DE: 1800 HYDROLOGY
DE: 0619 Electromagnetic theory
DE: 0925 Magnetic and electrical methods
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting