Dyke leakage localization and hydraulic permeability estimation through self-potential and hydro-acoustic measurements Self-potential 'abacus' diagram for hydraulic permeability estimation and uncertainty computation

Coimbra, Joao Carlos; Pinto, Iraja Damiani; Wurdig, Norma Luiza; Do Carmo, Dermeval Aparecido

Journal of Applied Geophysics 86(none)

2012


ISSN/ISBN: 0926-9851
DOI: 10.1016/j.jappgeo.2012.07.007
Accession: 036507019

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Abstract
In the present study, we propose the combination of two geophysical techniques, which we have applied to a dyke located in southeastern France that has a visible downstream flood area: the self-potential (SP) and hydro-acoustic methods. These methods are sensitive to two different types of signals: electric signals and water soil pressure disturbances, respectively. The advantages of the SP technique lie in the high rate of data acquisition, which allows assessment of long dykes, and direct diagnosis in terms of leakage area delimitation and quantification. Coupled with punctual hydro-acoustic cartography, a leakage position can be precisely located, therefore allowing specific remediation decisions with regard to the results of the geophysical investigation. Here, the precise localization of leakage from an earth dyke has been identified using SP and hydro-acoustic signals, with the permeability of the preferential fluid flow area estimated by forward SP modeling. Moreover, we propose a general abacus diagram for the estimation of hydraulic permeability of dyke leakage according to the magnitude of over water SP anomalies and the associated uncertainty. We propose a self-potential and acoustic data analysis for leakage characterization Low self-potential anomaly magnitude induce by a leakage can be detected Hydro-acoustic measurements are able to delimit an inflow surface area A leakage hydraulic permeability with associated uncertainty is performed abacus diagram of self-potential anomaly versus leakage permeability is proposed.