Inundation Analysis for Busan Metropolitan City Under Climate Change Using GRM and G2D Models

Abstract Submission: Due to the climate change, localized heavy rains have frequently occurred and rainfall intensity is becoming stronger in Korea. The change of rainfall pattern makes the urban area is frequently flooded and the damage is increasing trend. Particularly, Busan Metropolitan City has been experiencing frequent inundation, resulting in severe flood damage, due to its geographical proximity to the sea and its summer rainfall characteristics. To reduce flood damage by inundation, it is essential to understand the runoff and inundation patterns resulting from the change of climate pattern and also future climate scenarios in advance and to establish appropriate disaster prevention measures. Therefore, this study projected future rainfall in Busan Metropolitan City using the Shared Socioeconomic Pathways(SSP) climate change scenarios. Subsequently, we simulate the inundation patterns within Busan Metropolitan City by utilizing the Grid-based Rainfall-runoff Model (GRM) and the Grid-based 2-Dimensional land surface flood model (G2D) to evaluate areas at risk of inundation, considering both inundation area and inundation depth. The results of this study can be utilized as foundational research data in the process of establishing measures to reduce inundation damage in Busan Metropolitan City.

Keywords: Urban flood, Inundation analysis, SSP Scenarios, GRM, G2D

Acknowledgments
This research was supported by a grant(2022-MOIS35-005) of Policy-linked Technology Development Program on Natural Disaster Prevention and Mitigation funded by Ministry of Interior and Safety(MOIS, Korea).

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