Improving regional flood risk assessment using flood frequency and dendrogeomorphic analyses in mountain catchments impacted by tropical cyclones

River floods frequently occur when tropical cyclones hit land. Nonetheless, systematic, long-term discharge data remain rather scarce in many countries, which prevent proper analysis of peak discharges occurring during floods. The Térraba catchment is the biggest and most dynamic Costa Rica. In this study, we developed regional flood-frequency analyses combining tree-ring based estimation measurement at monitoring stations to derive flood quartiles. Flood quartiles were combined with Topographic Wetness Index (TWI) determine hazards along floodplains. risk assessment was on a high-resolution mapping infrastructure, population density (as measure exposure), social development index (to represent vulnerability). We show that cyclone-induced can be assessed accurately including dendrogeomorphic reconstructions systematic measurements. also assessments performed large-scale catchments if both coarse detailed inputs are used. results study will useful for schemes promoting resilience local populations.