GEOMORPHOLOGICAL MAPPING AND GIS TECHNIQUES FOR PREDICTING GEOMORPHOLOGICAL HAZARDS

L. Ortigosa, J. Arnaez and J.M. Garcia-Ruiz
Universidad de La Rioja (Espaņa)





The paper focuses on the fact that the prediction of geomorphic hazards needs the complementariety of geomorphological mapping and GIS. Several maps of the Central Spanish Pyrenees and the Iberian System have been elaborated at a 1:50.000 scale, including very heterogeneous topographic conditions and a great variety of lithologies. All the mass movements (planar slides, slumps, terracettes, solifluction lobes and debris flows) have been digitized. At the same time land-uses, plant cover, gradient and exposure maps have been also elaborated and all the information implemented in a Geographic Information System. The use of multivariable statistical procedures allows us to predict the most hazardous areas with a high confidence level