Integrating vulnerability processes into a sociohydrological model
In the 2026 article “Integrating Vulnerability Processes into a Sociohydrological Model,” the authors, Glenda Garcia-Santos, Romitha Wickramasinghe, Annekha Chetia, and Shinichiro Nakamura, investigate how flood risk evolves through the interaction of hydrological processes and human society. Building on earlier sociohydrological studies by Di Baldassarre and colleagues, the paper argues that vulnerability should not be viewed as a fixed condition. Instead, vulnerability changes over time through social memory, institutional learning, governance quality, preparedness, and adaptive capacity.
The study critiques traditional flood-risk models for focusing mainly on physical hazards such as rainfall, river discharge, and flood intensity while treating vulnerability as secondary or static. Drawing on the IPCC risk framework, the authors emphasize that flood risk results from the interaction of hazard, exposure, and vulnerability. Communities facing similar floods may experience very different outcomes depending on poverty, infrastructure, institutional support, and social inequality.
To address this issue, the authors develop a dynamic sociohydrological model integrating hazard, exposure, sensitivity, adaptive capacity, vulnerability, and flood losses. Their simulations show that flood losses are shaped not only by physical flood intensity but also by long-term social processes and feedback mechanisms. Improved adaptation and preparedness can reduce vulnerability even when exposure increases because more people settle in protected flood-prone areas. However, social memory fades over time, causing preparedness and institutional commitment to weaken if floods do not occur for long periods.
The article concludes that sustainable flood-risk management requires more than technical infrastructure such as levees. Long-term resilience depends on maintaining adaptive capacity, institutional continuity, preparedness, and equitable governance, especially under climate change, urbanization, and increasing global flood exposure.
