Identificación de factores condicionantes en la formación de dolinas mediante tomografía eléctrica de resistividades profunda (ERT). Valles del Ebro y del Fluvià (NE de España)
- M. Zarroca
- R. Linares
- C. Roqué
- F. Gutiérrez
- D. Carbonel
- J.P. Galve
- V. Rodríguez
- J. Guerrero
- Susanne Schnabel (coord.)
- Álvaro Gómez Gutiérrez (coord.)
Publisher: Universidad de Extremadura
ISBN: 978-84-617-1123-9
Year of publication: 2014
Pages: 502-505
Congress: Reunión Nacional de Geomorfología (13. 2014. Cáceres)
Type: Conference paper
Abstract
Subsidence processes and sinkhole activity have a significant impact on infrastructure and human activity in the covered evaporite karst areas of the Ebro and Fluvià valleys (NE Spain). This contribution discusses the capabilities of deep electrical resistivity tomography (ERT) for imaging geological-hydrogeological subsurface features to a depth of around 100 m, which may which may provide clues on the origin and evolution of sinkholes at the surface. Geophysical surveying campaigns were conducted in Zaragoza and Besalú (Girona) peri-urban areas. The resistivity images were calibrated using geomorphological information and available boreholewells logs. The processed images allowed (i) identifying deformation structures affecting both the bedrock and the alluvial cover; (ii) locating areas where interestratal evaporite dissolution might have been more intense; and (iii) hypothesizing about the local groundwater flow pattern. The results indicate that such local geomorphological-hydrogeological factors may play a key role in the development of sinkholes and their dynamics.