[H-CG23] Adaptation to climate change and its social implementation

[HCG23-04] Applicability of CLIMADA for river flood risk calculation and climate change impact assessment

*Daiki Tsurushima¹, Ryu Saito¹, Takayoshi Arai¹, Koji Dairaku² (1.Sompo Risk Management Inc., 2.University of Tsukuba )

Keywords:river flood, climate change, TCFD

NGFS (The Network of central banks and supervisors for Greeting the Financial System) has provided data and tools since 2021, including their own climate change scenarios and a numerical model(CLIMADA) etc. These data sources drive private companies (particularly financial companies) to examine the impact of climate change on their activities, following TCFD recommendation (Task force on Climate-related Financial Disclosures).
NGFS recommends use of open-source natural catastrophe model called CLIMADA for physical risk (socio-economic loss induced by river flood and typhoon) assessment. However, the performance/limitations of CLIMADA and methodology to asses the impact of climate change on river flood risk has not been examined well in previous studies. This means that the current modelling framework may lead to an inappropriate decision making due to a lack of information of the model performance and applicability.
Therefore, we focused on flood risk assessment module in CLIMADA and examined performance/limitations of the model based on the comparison with the other numerical models and data sources. We also examined the methodology for assessing the climate change impact on river flood risk on the basis of CLIMADA’s framework.