The Jubaguerra stream event: Analysis of a mass movement connected with a flash flood phenomenon and its application to other areas in the Gredos Mountains (Central Spain)

Abstract

Mass movements have been a predominant shaping process on the Jerte Valley slopes (Gredos Mountains, Spain) during the Quaternary time. The present day activity of these mass movements is characterized as either 'first-time failures' (shallow debris slides and debris flows) or 'reactivations' of pre-existing landslide deposits. The Jubaguerra event, a debris slide which took place on January the 24 th, 1996, is a good example of these 'first-time failures' and its associated hazard. In this paper, a hydrogeotechnical and morphological characterisation of the Jubaguerra failure is made. Once these factors were defined, they were input in a GIS, and a prospective model, applicable to the Gredos Mountains, has been made. In this model, areas with the same characteristics of the Jubaguerra failure are mapped.