Spatial reconfigurations within flood-prone areas: the case of Porto Alegre Metropolitan Region – Brazil

Ugalde, C., Braga, A. and Altafini, Diego ORCID: https://orcid.org/0000-0002-6559-2372 2022. Spatial reconfigurations within flood-prone areas: the case of Porto Alegre Metropolitan Region – Brazil. Presented at: 13th International Space Syntax Symposium, SSS 2022, Bergen, Norway, 20-24 June 2022. Published in: Van Nes, A. and Koning, R. E. eds. Proceedings of the 13th International Space Syntax Symposium, SSS 2022. Western Norway University of Applied Sciences (HVL), p. 542.

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Abstract

Porto Alegre’s Metropolitan Region (PAMR), located in the state of Rio Grande do Sul, Brazil, lays within the Caí, Jacuí, Gravataí and Sinos river basin. Its lowlands, that comprise the capital city of Porto Alegre and the bordering municipalities of Alvorada, Cachoeirinha, Gravataí and Canoas are historically flood-prone areas. In the last decades, a considerable urban spawl followed the metropolitan regional mobility axes towards these lowlands, given the demand for low-cost land for housing development. This phenomenon characterizes Brazilian urbanization patterns, in that advances towards unsuitable areas result in pressing socioeconomic problems. Until recently, the Metropolitan Planning Agency (METROPLAN) had at disposition only dated information about the areas’ hydrogeological risk, which hindered their envirionmental studies, hindering risk management strategies, and land parcelling policies. Considering that water-floods are a main urban disaster cause in Brazil, and the regional climate changes, the paper verifies, under the light of the most recent hydrogeological risk assessment, the potential spatial configuration changes that a flood-event can cause to the road-infrastructure at municipal and regional scales. Normalized Angular Integration (NAIN) and Choice (NACH) measures are used to compare the current spatial system to a simulation of the flood affected system, depicting a) the critical nodes and system collapse tendencies; b) the reconfiguration of the urban grid under flood-events; c) land-parcelling feasibility under risk areas. The results’ discussion addresses the road-network transformations and the multiscale resilience tendencies, indicating parameters to analyse novel parcelling permissions requests based on flood-risk constrains and the maintenance of spatial system integrity. © 2022 Proceedings 13th International Space Syntax Symposium, SSS 2022. All rights reserved.

Item Type:	Conference or Workshop Item (Paper)
Status:	Published
Schools:	Architecture
Publisher:	Western Norway University of Applied Sciences (HVL)
ISBN:	9788293677673
Last Modified:	01 May 2024 15:29
URI:	https://orca.cardiff.ac.uk/id/eprint/168537

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