Impact of April and May, 2024 extreme precipitation on flooding in Rio Grande do Sul, Brazil

IF 6 2区工程技术 Q1 ENVIRONMENTAL SCIENCES

Urban Climate Pub Date : 2025-06-01 DOI:10.1016/j.uclim.2025.102487

João Batista Ferreira Neto , Mariana Santos Freitas , Pablo Sergio Marques Simões , Gabriel Pereira , Heloisa Silva Leão , Ana Vitória Vilela Calmon , Björn Gücker

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引用次数: 0

Abstract

Floods and extreme precipitation events, intensified by climate change, have significantly impacted unadapted populations and natural systems. This study aims to analyze the effects of the extreme precipitation event in April and May 2024 on the eastern basins of Rio Grande do Sul, Brazil. Using the Normalized Difference Water Index (NDWI) on Sentinel satellite images, ERA5 daily reanalysis data, GOES synoptic imagery, and MapBiomas land use data, we mapped flooded areas, quantified precipitation, and identified atmospheric phenomena. The results indicate that atmospheric factors, such as low-level jets and atmospheric blocking, intensified regional precipitation. However, unplanned land occupation amplified the impact, exacerbating floods. A total of 10,744 km² was flooded, marking the highest precipitation extreme recorded. The findings highlight the significant role of human activities in increasing flood risks, emphasizing the need for improved land use planning and comprehensive risk management strategies to mitigate future extreme events. Integrating climate considerations into land use planning is crucial for building resilience and sustainability in vulnerable regions.

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2024年4月和5月极端降水对巴西南巴西大德州洪水的影响

气候变化加剧了洪水和极端降水事件，严重影响了不适应环境的人口和自然系统。本研究旨在分析2024年4月和5月极端降水事件对巴西南里约热内卢大德州东部盆地的影响。利用Sentinel卫星图像、ERA5每日再分析数据、GOES天气图像和MapBiomas土地利用数据的归一化差水指数（NDWI），我们绘制了洪水区域图，量化了降水，并确定了大气现象。结果表明，低空急流和大气阻塞等大气因子强化了区域降水。然而，无计划的土地占用放大了影响，加剧了洪水。共有10744平方公里被淹，这是有记录以来最高的极端降水。研究结果强调了人类活动在增加洪水风险方面的重要作用，强调了改善土地利用规划和综合风险管理战略以减轻未来极端事件的必要性。将气候因素纳入土地利用规划对于在脆弱地区建立复原力和可持续性至关重要。

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来源期刊

Urban Climate Social Sciences-Urban Studies

CiteScore

9.70

自引率

9.40%

发文量

286

期刊介绍： Urban Climate serves the scientific and decision making communities with the publication of research on theory, science and applications relevant to understanding urban climatic conditions and change in relation to their geography and to demographic, socioeconomic, institutional, technological and environmental dynamics and global change. Targeted towards both disciplinary and interdisciplinary audiences, this journal publishes original research papers, comprehensive review articles, book reviews, and short communications on topics including, but not limited to, the following: Urban meteorology and climate[...] Urban environmental pollution[...] Adaptation to global change[...] Urban economic and social issues[...] Research Approaches[...]