Li et al. (2026) Impact-based flood-damage assessment in Japan under longitudinal typhoon-track perturbations and levee-height variations during Hagibis (2019)

Identification

• Journal: Communications Earth & Environment
• Year: 2026
• Date: 2026-10-13
• Authors: Xiaoyang Li, Kei Yoshimura, Hironori Fudeyasu
• DOI: 10.1038/s43247-026-04077-8

Research Groups

• Xiaoyang Li (ORCID: orcid.org/0000-0003-1377-4913)
• Kei Yoshimura (ORCID: orcid.org/0000-0002-5761-1561)
• Hironori Fudeyasu

Short Summary

This study uses the Integrated Land Simulator to assemble an impact-based flood-damage assessment framework for Typhoon Hagibis (2019) in Japan, evaluating how typhoon-track position and levee height influence flood damage.

Objective

• Research question: How do variations in typhoon track and levee height affect flood damage in Japan?
• Principal hypothesis: Flood damage is highly sensitive to small typhoon-track shifts and levee-height variations.

Study Configuration

• Spatial Scale: National-scale application of impact-based flood-damage assessment in Japan.
• Temporal Scale: The study focuses on the passage of Typhoon Hagibis (2019) from 1200 UTC on October 10 to 0000 UTC on October 13, 2019.

Methodology and Data

• Models used:
  • Weather Research and Forecasting Model (WRF V4.3.3)
  • Integrated Land Simulator (ILS), which integrates MATSIRO and CaMa-Flood models.
• Data sources:
  • Japanese 55-year Reanalysis (JRA-55) for initial and boundary conditions
  • JMA MSM for atmospheric forcing data
  • Global three-dimensional building footprint dataset (3D-GloBFP) for building distribution data

Main Results

• The flood damage was highly sensitive to small typhoon-track shifts, with a 0.2° longitudinal shift causing an average damage difference of 83.3 billion JPY.
• Levee-height sensitivity experiments showed an average flood-damage reduction of approximately 9.1 billion JPY for each 10% increase in levee height.
• High-risk typhoon-track scenarios varied by region, with a 1.0° eastward shift producing the greatest flood damage in Kanto and nationwide.

Contributions

This study provides a national-scale application of impact-based flood-damage assessment in Japan, highlighting the importance of considering typhoon-track position and levee height in flood damage assessments.

Funding

• This research was supported by [insert funding sources and reference codes].

Citation

@article{Li2026Impactbased,
  author = {Li, Xiaoyang and Yoshimura, Kei and Fudeyasu, Hironori},
  title = {Impact-based flood-damage assessment in Japan under longitudinal typhoon-track perturbations and levee-height variations during Hagibis (2019)},
  journal = {Communications Earth & Environment},
  year = {2026},
  doi = {10.1038/s43247-026-04077-8},
  url = {https://doi.org/10.1038/s43247-026-04077-8}
}