Induced landslides susceptibility, application of the AHP method / Suscetibilidade induzida a escorregamentos, via aplicação do método AHP

Abstract

The landslides are processes of the natural dynamics of the earth, amplified in face of the inadequate occupation of areas susceptible to mass movements, which can lead to disasters with material and human damages. In line with this reality, the present article aims to evaluate the susceptibility induced to landslides in the north coast of Maceió - AL, by applying the Analytic Hierarchy Process - AHP method, in GIS environment. Factors related to geology, geomorphology, soils, slope and shape of the terrain and land use were used. Spatial analysis was performed using multicriteria methods and map algebra with the weighting of variables via AHP. To validate the results, we used an inventory map containing 29 landslide scars, identified in 2017. The results indicate that the studied area has medium potential for occurrence of landslide processes, in which the susceptibility classes are low, medium, high, presented a frequency of 10%, 75% and 15% respectively. Validation shows that 74% of landslides are concentrated in the high susceptibility class, 25% in the medium susceptibility class and only 1% in the low susceptibility class. Thus, the map obtained can be considered useful for monitoring areas susceptible to landslides

Keywords

• geomorphology
• landslides
• geoprocessing