地先のハザードカーブに基づいた流域の地理的構造化とその自然的・社会的要因の分析

抄録

Hazard Curve (HC) represents the probabilistic hazard of each point, by describing the relation between exceedance probability and maximum inundation depth. In this study, we investigated the geospatial structure of point-based and probabilistic hazard through ensemble flood simulation using d4PDF and RRI model, and HC clustering analysis in Yoshino river basin, Japan. As a result, we demonstrated that valley bottom sections and meandering sections have contrasting structure: in valley-bottom plain section, probabilistic hazard characteristics change from upstream to downstream, but in meandering plain section, probabilistic hazard characteristics change depending on the proximity to the river channels. By comparing these structures with geological maps and natural landforms, we also discussed the natural and social factors of these geospatial hazard structures.