Simulação de inundação em Boa Vista - RR, uso dos modelos de elevação Alos Palsar, MERIT e software HEC-RAS

Abstract

The Boa Vista, Roraima Urban zone are located at the area of flat terrain with natural lagoon formation, that condition contribute for the flood occurrence in the raining season. These floods cause numerous incidents and losses to the population that occupies these areas, making it very important to carry out flood simulations that can inform people of the risks and assist in prevention and planning. To carry out simulations of flood in stream with the HEC-RAS Software, the relief condition with little altimetric variation in addition to the presence of forest islands on the banks of the main streams, result in models with a high presence of errors, making it difficult to apply a methodology that includes these elevation models. This was observed when comparing the simulations with the visual observation of the events and the research. With means to resolve this problem, was verified the methodology toward the simulation in HEC-RAS and MERIT Digital Elevation Model of the flood in a stream of the Olimpico district, west zone of the city. Then was possible to verify with the mentioned methodology the resulting flood coverage for the return period of 5, 10 e 20 years.