Hazard Zoning for Landslides Connected to Torrential Floods in the Jerte Valley (Spain) by using GIS Techniques |
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| Authors: | Carrasco RM Pedraza J Martin-Duque JF Mattera M Sanz MA Bodoque JM |
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| Institution: | (1) Departamento de Ingeniería Geológica y Minera, Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, Campus Fábrica de Armas, 45071 Toledo, Spain;(2) Departamento de Geodinámica, Facultad de Geología, Universidad Complutense, José Antonio Novais s/n, 28040 Madrid, Spain |
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| Abstract: | The Jerte Valley is anortheast-southwest tending graben located in the mountainous region of west central Spain (Spanish Central System). Mass movements have been a predominant shaping process on the Valley slopes during the Quaternary. Present day activity is characterized as either `first-time failure' (shallow debris slides and debris flows) or `reactivations' of pre-existing landslides deposits.A delineation of landslide hazard zoningwithin the Valley has been carried out by using the detailed documentation of a particular event (a debris slide and a sequel torrential flood, which occurred on the Jubaguerra stream gorge), and GIS techniques. The procedure has had four stages, which are: (1) the elaboration of a susceptibility map (spatial prediction) of landslides; (2) the elaboration of a map of `restricted susceptibility' in the particular case of slopes that are connected to streams and torrents (gorges); (3) the elaboration of a digital model which relates the altitude to the occurrence probability of those particular precipitation conditions which characterized the Jubaguerra event and (4) the combination of the probability model with the `restricted susceptibility map', to establish `critical zones' or areas which are more prone to the occurrence of phenomena that have same typology as this one. |
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| Keywords: | Spanish Central System debris slide debris flow torrential flood digital precipitation models Geographic Information Systems |
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