Land Use Change, Extreme Precipitation Events, and Flood Damage in South Korea: A Spatial Approach

Abstract

Floods are major social and environmental concerns in many urban areas. We investigated how changes in land cover, sociodemographic conditions, and meteorological factors affect flood damage in districts of South Korea. Using historical maps and spatial analysis, we showed that flood damages increased in the areas where rapid urbanization happened without coordinated urban planning. High flood damage areas are not spatially randomly distributed, and the hotspots of high damage areas are concentrated in population centers that underwent rapid development after 1975. Additionally, human modifications of natural channels further exacerbated flood risks during the development stage and subsequent periods. Total annual precipitation is positively related to the flood damage at a higher spatial unit. This study underscores the importance of understanding the historical–geographical conditions, and how humans either increased or reduced the flood damage through social and infrastructure interventions. Findings of this study have implications for resilient flood management for regions that are currently facing the dual challenges of land densification and climate change-induced heavy precipitation.