Journal
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
Volume 70, Issue 2, Pages 265-277Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10064-010-0332-9
Keywords
Landslide susceptibility; Bivariate statistical analysis; Semi-arid mountain environment; Sierra Nevada
Funding
- Ministry of Science and Education of Spain [CGL2005-03332, CGL2008-04854]
- Regional Government [P06-RNM-02125]
- Andalusian Research Plan
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Landslide susceptibility is analysed in a semi-arid mountain environment, on the southern slope of Sierra Nevada. In a study area of 460 km 2, 252 landslides were inventoried, affecting 3.2% of the total surface area. These landslides were mainly slides and flows on phyllite, schist and marble units in the Inner Zone of the Betic Cordillera. The most relevant determining factors proved to be elevation, slope angle, slope aspect and lithology. Triggering factors include mainly short-term landslide generation during heavy rainfall, as well as sporadic earthquakes or long-term activation by land-use changes, river over-excavation, etc. Although landslide susceptibility, assessed by the GIS matrix method, is predominantly low, some 15% of the study area shows moderate to very high susceptibility, coinciding with the sites of public works in the region. The map drawn was validated by the degree-of-fit method, registering values above 83.2% for the zones of high and very high susceptibility.
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