Análise de alagamentos urbanos a partir de veículos aéreos não-tripulados: um estudo de caso em Pau dos Ferros/RN
Brazilian cities, given the rapid urban expansion and the lack of infrastructure in terms of sanitation services, are highly susceptible to the occurrence of environmental disasters, especially floods and flooding. Thus, this work aimed to develop a method for analyzing urban flooding based on high...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/45855 |
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| Resumo: | Brazilian cities, given the rapid urban expansion and the lack of infrastructure in terms of sanitation
services, are highly susceptible to the occurrence of environmental disasters, especially floods and
flooding. Thus, this work aimed to develop a method for analyzing urban flooding based on high
spatial resolution Digital Elevation Models (DEM) through the photogrammetric processing of
Unmanned Aerial Vehicle (UAV) images, associated with strategic survey in GNSS. For this
purpose, bibliographic and cartographic research was carried out. An aerophotogrammetric survey
was carried out, enabling the verification of image quality and alignment; the production of three
digital surface models (MDS), one being simplified, unchanged and corrected; and the production
of an orthomosaic. Remote sensing was also used, enabling a delimitation of the drainage network,
micro-basins, topographic depressions and flood simulation. Thus, 7 topographic depressions were
identified and two drainage galleries were modeled. In these depressions, the misallocation of
existing drainage instruments or even their inexistence was found, impacting no potential for
accumulation of rainwater in its entirety. In other cases, the accumulated rainwater only flows to
other locations after a depth of 30 cm. Finally, there is a need for correction in digital elevation
models so that they represent more faithfully the flow of rainwater, as well as the potential for
accumulation of topographic depressions. |
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