Characterization of shallow groundwater in Eocene sediments of Panama Canal Watershed using electrical techniques

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Irving Díaz
Alexis Mojica Ábrego
Carlos Ho
Reinhardt Pinzón
José Fábrega
Erick Vallester
David Vega
Fred Ogden
Jan Hendrickx
Enviado: Jun 29, 2016

Resumen

This work is focused on the detection of seepages caused by the affluent located in a small area of the Panama Canal Basin during the dry season, and to define the subsurface stratigraphy (Eocene sediments) that characterize this area through a geophysical survey. Two electrical resistivity tomography were developed to identify the extent of infiltration and the nature of the clay layers vertically and laterally, these results were corroborated by a drilling operation in the vicinity of electrical tests and based on this information, established a model for a two-dimensional geoelectric profile in order to compare (i) the pseudo-sections of synthetic and measured apparent electrical resistivity, and (ii) the electrical resistivity tomography as a result of the inversions of such pseudo-sections. The results of electrical resistivity tomography obtained in the two profiles revealed the existence of (i) a surface layer moderately resistant (18-85 ohm.m) with a thickness not exceeding 1,8 m, (ii) an area of high electrical conductivity (3,8 to 10,7 ohm.m) with a thickness not exceeding 9.5 m and (iii) a resistant substratum with electrical resistivity values calculated in excess of 30,1 ohm.m and a range depth ranging from 2 to 11,5 m. The drilling operation in the vicinity of the geophysical tests revealed the presence of clay with varying moisture content and density, and thicknesses that corroborate the results of the geophysical evidence. The two-dimensional geoelectrical model of Profile 1 was established according to the results of electrical resistivity tomography as well as the profile and information of the drilling operation. Based on the results of this study, we conclude that the infiltrations generated by the affluent in this part of the Isthmus of Panama are very important, even in periods when precipitation levels are.

Palabras clave

Apparent resistivity, electrical resistivity tomography, forward problem, Gamboa zone, inverse data, Panama Canal watershed, synthetic data

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Cómo citar
Díaz, I., Mojica Ábrego, A., Ho, C., Pinzón, R., Fábrega, J., Vallester, E., Vega, D., Ogden, F., & Hendrickx, J. (1). Characterization of shallow groundwater in Eocene sediments of Panama Canal Watershed using electrical techniques. I+D Tecnológico, 8(1), 33-42. Recuperado a partir de https://revistas.utp.ac.pa/index.php/id-tecnologico/article/view/97
Biografía del autor/a

Irving Díaz, Universidad Tecnológica de Panamá

Estudiante de la Maestría en Ciencias de la Ingeniería Mecánica Facultad de Ingeniería Mecánica

Alexis Mojica Ábrego, Universidad Tecnológica de Panamá

Laboratorio de Investigación en Ingeniería y Ciencias Aplicadas Centro Experimental de Ingeniería

Carlos Ho, Universidad Tecnológica de Panamá

Laboratorio de Investigación en Ingeniería y Ciencias Aplicadas Centro Experimental de Ingeniería

Reinhardt Pinzón, Universidad Tecnológica de Panamá

Centro de Investigaciones Hidráulicas e Hidrotécnicas

José Fábrega, Universidad Tecnológica de Panamá

Centro de Investigaciones Hidráulicas e Hidrotécnicas

Erick Vallester, Universidad Tecnológica de Panamá

Centro de Investigaciones Hidráulicas e Hidrotécnicas

David Vega, Universidad Tecnológica de Panamá

Centro de Investigaciones Hidráulicas e Hidrotécnicas

Fred Ogden, University of Wyoming

Department of Civil & Architectural Engineering College of Engineering and Applied Science

Jan Hendrickx, New Mexico Tech

Department of Earth & Environmental Science