Mapeamento de áreas suscetíveis a enchentes empregando técnicas de análise espacial no perímetro urbano de Goiânia

Abstract

This work aimed to identify areas at risk of flooding using a digital elevation model and SIG data (Geographic Information System), in which such information was necessary for the creation of the hydrological model using the HEC-RAS software. Some parameters were also evaluated according to the property of the local drainage system, such as the roughness coefficient, flow rate and slope. From the result created with this model, the QField mobile device application was used, which allows the identification of risk areas from a field analysis, where it works offline in the collection of the necessary points for validation and allows the photographic record, in addition to its N, E and H coordinates in the UTM (Universal Transversa de Mercator) projection system. Following the result, the severity of the risk areas around the floodplain was analyzed using the AHP (Analytic Hierarchy Process) decision analysis method, where the determining variables were: altitude, slope and degree of urbanization, using the QGIS software. Finally, maps were generated identifying the areas at risk of flooding and the intensity of each region, with the degree varying in 5 classes: very low to very high.