Suscetibilidade à inundação em uma bacia amazônica: igarapé do cacau pirêra, Iranduba - AM

Abstract

Mapping flood susceptibility is an essential step in hydrological risk management and preventive territorial planning. This study aimed to assess the flood susceptibility in the Igarapé do Cacau Pirêra watershed, located in the municipality of Iranduba (AM), providing technical support for disaster mitigation. The applied methodology used a combination of several geo- environmental elements, such as HAND (Height Above Nearest Drainage), slope, precipitation, pedology, and land use, which were evaluated and classified using the Analytic Hierarchy Process (AHP). After applyingthe method, the areas were classified into seven susceptibility categories: low,very low, moderately low, moderately medium, moderately high, high, and very hi. The results showed an uneven and critical susceptibility distribution. The regions classified as highly and very highly susceptible correspond to 34.87% of the total area, with the very high class representing 30.87% of the basin. This concentration of susceptibility is aggravated by the combination of low elevation geomorphological factors (HAND), high rainfall, and, notable, soil sealing in areas of urban expansion. Spatial analysis revealed that the areas closest to water courses are highly susceptible to flooding, directly affecting riverside communities. Thus, the study highlights the importance of applying geoprocessing technologies in disaster management and public policy formulation. The method proved effective in identifying flood hotspots, contributing significantly to the prediction and mapping of susceptible areas. Therefore, the implementation of preventive strategies and public awareness are essential measures to minimize future impacts and ensure greater safety for affected communi