DEFINIÇÃO DAS ÁREAS PROPENSAS À INUNDAÇÃO COM USO DE MODELO HIDRÁULICO 2D DO IBER: CASO DE ESTUDO DE ESTRELA E LAJEADO/RS - BRASIL.

In Rio Grande do Sul, Brazil, many cities are frequently affected by floods, with Estrela and Lajeado being notable examples. The use of 2D hydraulic models aids in identifying flood areas and water levels. In this context, the objectives of this work are: i) to define the flood-prone areas and water heights in the urban areas of Estrela and Lajeado based on a 2D hydraulic model; ii) to identify the number of buildings and types of land use and cover exposed; and iii) to validate the results with fieldwork and historical flood data. The hydraulic model was processed using IBER 2.5.1, based on secondary data. The validation of the model was carried out by comparing the results with another hydraulic model and field data. The data indicated a satisfactory similarity of the 2D hydraulic model obtained with IBER, both with the data published by the Hydraulic Research Institute of the Federal University of Rio Grande do Sul, showing a spatial overlap of 92.6% and 95.9% in Estrela and Lajeado, respectively. The results allowed for a prompt quantification of the buildings, revealing that Lajeado has 1,958 and Estrela has 3,385 exposed constructions, in addition to the types of land use and cover located in flood-prone areas of the Taquari-Antas River in the urban areas of both municipalities. This work contributes to the management of emergencies and responses to flood events. The 2D model generated in IBER proved to be a suitable option for strategic planning and serves as a tool for preventing damage and losses caused by flood events. [ABSTRACT FROM AUTHOR]