Reconstruction of long-term hydrologic change and typhoon-induced flood events over the entire island of Taiwan

Jac Stelly, Yadu Pokhrel*, Amar Deep Tiwari, Huy Dang, Min Hui Lo, Dai Yamazaki, Tsung Yu Lee

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

摘要

Study region: The island of Taiwan. Study focus: This study presents long-term and high-resolution modeling of flood occurrence, interdecadal patterns of river-floodplain dynamics, and analysis of flooding during two typhoon events—Nari and Morakot over Taiwan. The modeling system combines a hydrological model (HiGW-MAT) and a river hydrodynamics model (CaMa-Flood), simulating hydrologic-hydrodynamic processes at ∼ 5 km resolution with flood occurrences downscaled to ∼ 90 m. New hydrological insights for the region: As the first investigation to conduct spatially comprehensive and temporally continuous modeling in Taiwan, this study presents important advances on the application of large-scale hydrological-hydrodynamic models in settings like that of Taiwan with important implications on flood prediction under climate change. The assessment of interdecadal changes in streamflow indicates no consistent trends over the past four decades; however, the variabilities in monthly-scale streamflow are significant and regionally diverse across Taiwan. Decadal changes in flood occurrence are also minimal at the island-scale, but the changes vary substantially across different regions and exhibit an increased variability over time. Furthermore, the simulated flood patterns in response to Typhoons Nari and Morakot suggest that the modeling framework can be used to reproduce the spatial dynamics and temporal progression of flooding under extreme events in relatively small regions like Taiwan.

原文英語
文章編號101806
期刊Journal of Hydrology: Regional Studies
53
DOIs
出版狀態已發佈 - 2024 6月

ASJC Scopus subject areas

  • 水科學與技術
  • 地球與行星科學(雜項)

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