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Líneas de Investigación:

GEOTECNIA

El objetivo de esta línea de investigación es el análisis y la prevención de riesgos naturales de origen geológico, mediante el estudio de los procesos que los desencadenan y la realización de mapas temáticos que los acotan espacialmente.

Los resultados obtenidos tienen una aplicación directa a los colapsos kársticos relacionados con cavidades y deslizamientos y requieren de la aplicación combinada de los diferentes métodos de prospección geofísica, orientados al análisis de riesgos geológicos.

Resultados destacados:

Detection of underground cavities by combining gravity, magnetic and ground penetrating radar surveys: a case study from the Zaragoza area, NE Spain: T. Mochales, A. M. Casas, E. L. Pueyo, O. Pueyo, M. T. Román, A. Pocoví, M. A. Soriano and D. Ansón. Environmental Geology, 53 (5): 1067-1077 (2008).

Abstract: A geophysical survey routine is proposed to detect underground cavities and dolines; it is based on the sequential application of magnetic, low-frequency ground penetrating radar (GPR) and microgravity techniques.

A case study near Zaragoza (Ebro valley, Spain) demonstrates the applicability of these methods.

The strong contrast of magnetic and electromagnetic properties (and to a lesser scale, of density) between the doline filling and the surrounding stratified Tertiary and Quaternary rocks allows the shape of filled cavities to be clearly outlined by these methods. (-> artículo completo)

Space–time distribution of ancient and active alluvial karst subsidence: examples from the central Ebro Basin, Spain: J. L. Simón, M. A. Soriano, L. E. Arlegui, J. Gracia, C. L. Liesa and A. Pocoví. Environmental Geology, 53 (5): 1057-1065 (2008).

Abstract: Space and time variations of alluvial karst subsidence in the central Ebro Basin are analysed in trenches (paleodolines), aerial photographs (historical dolines) and field surveys (present-day active dolines).

The measured subsidence rates, as well as a comparison between densities of paleodolines computed in randomly selected scan-lines and density of active dolines computed in maps, suggest that present-day subsidence in favourable areas is more intense than that of Pleistocene times.

According to diachronic maps drawn from (a) different aerial photographs taken after 1946 and (b) field surveys on deformations in urbanized areas, subsidence behaved as a nearly steady process while the whole area was used for agriculture.

In contrast, rapid changes (through periods of several tens of years) have occurred in urbanized areas, in which dolines expand their boundaries through small marginal collapses, shifting sharply their sinking centres to neighbouring sites. These rapid changes do not have an equivalent in observed paleodolines. (-> artículo completo)

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