Landslide hazard assessment by integrating GIS, remote sensing and multicriteria evaluation methods. - Applied on Barranco de Tirajana (Gran Canaria Island)
An indirect method to assess hazard from landslides within a GIS is proposed. The method integrates factors determining slope instability, some of which have been derived from analysis of multi-spectral and multi-temporal satellite imagery, and multi-criteria evaluation techniques based on analytical hierarchies and weighted linear sums of factors and class weights. This method has been applied to the Barranco de Tirajana basin, Gran Canaria Island. The basin is mostly covered by large rotational and translational landslide deposits, which were originally developed in lava flows and volcanic breccia. The method allows to quantitatively evaluate the weight allocation consistency, therefore reducing the typical subjectivity involved in the indexing approaches. This method is considered particularly useful for hazard assessment at medium scales (1:25 000 and 1:50 000) in areas where there are hardly any geotechnical and hydrogeological data available, and where it is not feasible to carry out suitable statistical sampling, as in the Tirajana basin.
Bibliographic Reference: An oral report given at: V Simposio Nacional sobre Taludes y Laderas Inestables. Held in: Madrid (ES), 27-30 November 2001
Record Number: 200114159 / Last updated on: 2001-12-21
Original language: es
Available languages: es