A new approach for gridded risk assessment of rainfall-triggered flood and landslide hazards over a large region based on coupled flood-landslide modelling and ensemble simulation

Abstract

The assessment of rainfall-triggered flood and landslide hazards is crucial in mitigating the potential damages to both human lives and property. In this study, we conducted a gridded risk assessment of flood and landslide hazards in Shaanxi Province, utilizing an ensemble simulation of a coupled model. The ensemble simulation intervals of discharges met the observed discharges well at the four hydrological stations, and the global accuracies of landslide modeled results were mostly greater than 0.9. The flood hazard rating was low in most areas while the landslide hazard rating was high in south. The high integrated vulnerability area was mainly concentrated in the central region. Flood risk was low in almost the entire area, while landslide risk was high in south and low in the central and northern regions. The methods proposed in this study provide a new perspective on regional risk assessment.