Mapeamento de suscetibilidade a movimentos de massas na área urbana de Areia-PB

Mapping susceptibility to mass movements in the urban area of Areia-PB.

Abstract

Disasters on Brazilian urban slopes are consequences of a set of geomorphometric weaknesses, intensified by human action. The identification of areas whose natural dynamics favor the instability of the massif is a subsidy for the planning and occupation of urban space. Therefore, the management units need reliable and optimized data for decision making. Faced with the conditions of the municipality of Areia/PB, a municipality located in a mountainous region of the state, this study aimed to map the areas most susceptible to the occurrence of mass movements on slopes through a model based on GIS and AHP (Analytic Hierarchy Process). Eight mappable criteria were considered for the study. After applying the GIS-AHP method, it was observed that the results were compatible with the data collection and previous studies prepared for the city. The criteria of Roads, Geology, Land Use and Coverage, Altitude and Slope were the most critical in this analysis. In total, 51.9% of the studied area is in the highest susceptibility classes. It was also observed that 91.7% of the mass movement points mapped during the field work were found in the areas of greatest susceptibility.