Metropolitan Region of São Paulo (Brazil) and Its Potential Flood-Related Mobility Problems (PAP014729)

Código

PAP014729

Autores

Luciana de Resende Londe, Leonardo Bacelar Lima Santos, Aurelienne A. S. Jorge, Andrezza Fogaça Coelho, Erico Soriano

Tema

Urban Floods

Resumo

Due to its huge population and physical characteristics, Brazil is vulnerable to many natural disasters and their impacts affect thousands or even millions of people each year. The most frequent disasters in Brazil include mass movements, floods and flash floods. When floods happen in mega cities, such as São Paulo (Brazil), there is a concern about their impact on urban mobility. Urban mobility refers to the condition in which people and goods displacements occur in urban space. The estimate of the number of people that leave, pass through and arrive at each traffic region subdivision, together with hydrographic information, support the computation of those people whose mobility is affected during flood episodes. For this specific work, 460 traffic zones (TZ) appeared at least once as an origin or a destination (OD data). To set the distance matrix, we have used the Google´s API Distance Matrix. Provided by origin and destination coordinates and travel mode (driving or walking), we have developed a PHP script to get each travel length. Considering the 100 most common travels - the 100 origindestination ordered pairs characterized by high number of users and intense flow, we saved the path in KML format, based on Google Maps resources. The saved paths and other data (hydrography, traffic zones, and flow matrices) were inserted into PostgreSQL, together with its spatial extension, PostGIS. A script written in python was created to handle with geometric data inside the dataset, using a specific library to accomplish the connection to PostgreSQL. The script reads the flow matrices and matches this data to hydrography, traffic zones and routes. To compute the amount of people directly affected in their mobility, we selected all traffic zones intercepted by local rivers. Then, all people with origin or destination in one of these zones were summed up. The total number of indirectly affected people was calculated through the examination of the routes that intersect each river, and, based on that information, we computed how many people use each of those routes. This information may be used by different stake holders to draw maps, analyze strategies, develop specialized planning and suggest measures to mitigate flood effects on urban mobility in a specific region.