Methodology for constructing a flood-hazard map for a future climate

Kimura, Yuki; Hirabayashi, Yukiko; Kita, Yuki; Zhou, Xudong; Yamazaki, Dai

doi:https://doi.org/10.5194/hess-27-1627-2023

Articles | Volume 27, issue 8

https://doi.org/10.5194/hess-27-1627-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/hess-27-1627-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 27, issue 8

Research article

|

20 Apr 2023

Research article |

| 20 Apr 2023

Methodology for constructing a flood-hazard map for a future climate

Yuki Kimura, Yukiko Hirabayashi, Yuki Kita, Xudong Zhou, and Dai Yamazaki

Supplement

https://doi.org/10.5194/hess-27-1627-2023-supplement

Data sets

MERIT Hydro: global hydrography datasets D. Yamazaki http://hydro.iis.u-tokyo.ac.jp/~yamadai/MERIT_Hydro/

Global Reach-level Flood Reanalysis Reachhydro.org https://www.reachhydro.org/home/records/grfr

Model code and software

global-hydrodynamics/CaMa-Flood\_v4, CaMa-Flood (v4.01) D. Yamazaki, M. Revel, R. Hanazaki, X. Zhou, and T. Nitta https://doi.org/10.5281/zenodo.4659583

Short summary

Since both the frequency and magnitude of flood will increase by climate change, information on spatial distributions of potential inundation depths (i.e., flood-hazard map) is required. We developed a method for constructing realistic future flood-hazard maps which addresses issues due to biases in climate models. A larger population is estimated to face risk in the future flood-hazard map, suggesting that only focusing on flood-frequency change could cause underestimation of future risk.