Assessment of climate change impacts on river flooding due to Typhoon Hagibis in 2019 using nonglobal warming experiments

In this study, a series of numerical analyses meteorology, runoff, river flow, and inundation were performed to quantitatively evaluate the effects historical warming on precipitation, discharge, water level, flood inundation. This study was Chikuma River Basin in Japan caused by Typhoon Hagibis 2019. The impact analyzed comparing nonglobal experiments (NonWs) control (CTLs) reproduce current situation. Calculated results showed that ratios index CTLs NonWs (mean CTL mean NonW) as indicators 1.08, 1.22, 1.08–3.08 for total peak level (from pre-flood high-water level), respectively, 48.1 595 overflow depth volume River, respectively. Results hydrologic-sensitivity analysis indicated influence during last 40-year period already evident flooding, whose sensitivities higher than those discharge level.