IMPACT OF ATMOSPHERIC SPATIAL-TEMPORAL RESOLUTION ON STORM SURGE SIMULATION AND RELATED DAMAGE CHANGE - CASE STUDY ON 2018 TYPHOON JEBI -

Typhoon intensity is projected to increase in the future due to climate change (IPCC AR6). Accordingly, future storm surge height can increase, resulting in an expected urban damage increase. It is important to know the relation between typhoon intensity and expected direct and indirect damages because of the estimation of the cost-benefit ratio for infrastructure investment. In order to make appropriate infrastructure design or upgrades, it is necessary to have an accurate understanding of the relation between the storm surge intensity and its expected damage changes as a function of typhoon characteristics. This study aims to estimate storm surge height, inundation, and related damage based on a high- resolution numerical weather prediction model. The target typhoon is Jebi, which caused severe damage along the coastal area of Osaka in 2018, and the target area is Osaka Bay, Japan. The sensitivity to storm surge height is examined by numerical simulation under various meteorological conditions. The fragility function is then used to estimate the amount of inundation damage. We compare the storm surge simulation accuracy and the amount of inundation damage due to the meteorological conditions.