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Transport Processes in Porous Media by Self-Potential Method


Affiliations
1 Consiglio Nazionale delle Ricerche, Istituto di Metodologie per l’Analisi Ambientale, Laboratorio Hydrogeosite, Contrada Santa Loja, 85050 Tito, Italy
 

A controlled diffusion/infiltration column experimental activity was carried out with the aim of monitoring the leakage of a salty water plume by time-lapse self-potential (SP) measurements. In particular, three tracer tests with different NaCl concentrations (6.00, 1.00, and 0.25 g L−1) were performed and all the measured SP signals showed a sharp reduction corresponding to the arrival of saline front with negative electrical potential values (−78.99 ± 3.24 mV, −54.52 ± 2.28 mV, and −24.12 ± 1.21mV) which decrease with increasing volume of tracer introduced into the column. Then, measured self-potential values were converted into salt concentration ones by the Planck-Henderson equation and sand diffusion (𝐷) and longitudinal dispersivity (𝛼𝐿) values were estimated by modelling the transport equations in the COMSOL Multiphysics environment. Finally, the results show that measured and estimated NaCl concentrations are well correlated.
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  • Transport Processes in Porous Media by Self-Potential Method

Abstract Views: 66  |  PDF Views: 12

Authors

Valeria Giampaolo
Consiglio Nazionale delle Ricerche, Istituto di Metodologie per l’Analisi Ambientale, Laboratorio Hydrogeosite, Contrada Santa Loja, 85050 Tito, Italy
Daniela Calabrese
Consiglio Nazionale delle Ricerche, Istituto di Metodologie per l’Analisi Ambientale, Laboratorio Hydrogeosite, Contrada Santa Loja, 85050 Tito, Italy
Enzo Rizzo
Consiglio Nazionale delle Ricerche, Istituto di Metodologie per l’Analisi Ambientale, Laboratorio Hydrogeosite, Contrada Santa Loja, 85050 Tito, Italy

Abstract


A controlled diffusion/infiltration column experimental activity was carried out with the aim of monitoring the leakage of a salty water plume by time-lapse self-potential (SP) measurements. In particular, three tracer tests with different NaCl concentrations (6.00, 1.00, and 0.25 g L−1) were performed and all the measured SP signals showed a sharp reduction corresponding to the arrival of saline front with negative electrical potential values (−78.99 ± 3.24 mV, −54.52 ± 2.28 mV, and −24.12 ± 1.21mV) which decrease with increasing volume of tracer introduced into the column. Then, measured self-potential values were converted into salt concentration ones by the Planck-Henderson equation and sand diffusion (𝐷) and longitudinal dispersivity (𝛼𝐿) values were estimated by modelling the transport equations in the COMSOL Multiphysics environment. Finally, the results show that measured and estimated NaCl concentrations are well correlated.