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)
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J. Pedraza, R. M. Carrasco, J. M. Bodoque, M. A. Sanz, J. F. Martín-Duque, A. González & A. Díez
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 24th, 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. Keywords: debris slide, flash flood, natural hazards, Gredos Mountains, Spanish centralsSystem. 1 Introduction: mass movements in the Jerte Valley The Jubaguerra arroyo is a mountain stream within the Jerte Valley; it is a northeast-southwest tending graben located in the mountainous region of western central Spain (Sierra de Gredos, Spanish Central System) (Figure 1).
debris slide, flash flood, natural hazards, Gredos Mountains, Spanish centralsSystem.