Integrating Urban Mobility Analysis and Flood Risk Mapping: A Case Study in Ho Chi Minh City Syazwi Quthbi Al Azizi (1,2), Nurjannah Nurdin (2)
School of Architecture, Planning and Policy Development,
Bandung Institute of Technology (ITB), Bandung, Indonesia (1), Research and Development Center for Marine, Coast and Small Islands, Hasanuddin University, Makassar, 90245, Indonesia (2)
Abstract
Ho Chi Minh City, with 45% of its area lying less than one meter above sea level, faces dual challenges of rapid urbanization and frequent flooding, which severely impact urban mobility and resilience. On rainy days, its intricate road network intensifies traffic congestion, particularly for car commuters. This study examines the relationship between urban mobility patterns and flood risk in Districts 1, 4, 5, 6, and 11-areas characterized by high mobility density and significant flood exposure. Using historical traffic data and Sentinel-1 SAR imagery from 2020 to 2022, spatial and temporal analyses were conducted to assess the impacts of flooding on mobility and population exposure. The mobility analysis reveals that average vehicle speeds often drop below 25 km/h during peak hours, while flood extent mapping using VH polarization-based change detection identifies annual flood coverage ranging from 1,538 to 2,359 hectares. Affected population estimates range from 157 to 77,404 individuals, underscoring the dual vulnerabilities of congestion and inundation. To address these challenges, the study proposes the integration of sustainable transport systems to alleviate congestion, the implementation of nature-based flood mitigation strategies in central districts, and the adoption of resilient urban planning to reduce exposure and enhance adaptive capacity. These measures aim to minimize disruption and promote a more sustainable and resilient urban environment in Ho Chi Minh City.
Keywords: Urban Mobility, Flood Risk Mapping, Ho Chi Minh City, Sentinel-1 SAR, Spatial Analysis.
