Flood risk map from hydrological and mobility data: A case study in São Paulo (Brazil)

Cities increasingly face flood risk primarily due to extensive changes of the natural land cover to built‐up areas with impervious surfaces. In urban areas, flood impacts come mainly from road interruption. This article proposes an urban flood risk map from hydrological and mobility data, considerin...

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Bibliographic Details
Published in:Transactions in GIS 2022-08, Vol.26 (5), p.2341-2365
Main Authors: Tomás, Lívia Rodrigues, Soares, Giovanni Guarnieri, Jorge, Aurelienne A. S., Mendes, Jeferson Feitosa, Freitas, Vander L. S., Santos, Leonardo B. L.
Format: Article
Language:English
Subjects:
Algorithms
Case studies
Cells
Components
Environmental risk
Flood mapping
Floods
Hydrology
Land cover
Megacities
Mobility
Risk
Urban areas
Vulnerability
Watercourses
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Summary:Cities increasingly face flood risk primarily due to extensive changes of the natural land cover to built‐up areas with impervious surfaces. In urban areas, flood impacts come mainly from road interruption. This article proposes an urban flood risk map from hydrological and mobility data, considering the megacity of São Paulo, Brazil, as a case study. We estimate the flood susceptibility through the Height Above the Nearest Drainage algorithm; and the potential impact through the exposure and vulnerability components. We aggregate all variables into a regular grid and then classify the cells of each component into three classes: Moderate, High, and Very High. All components, except the flood susceptibility, have few cells in the Very High class. The flood susceptibility component reflects the presence of watercourses, and it has a strong influence on the location of those cells classified as Very High.
ISSN:1361-1682
1467-9671
DOI:10.1111/tgis.12962