2:55 PM - 3:15 PM
[U11-04] Integrated Analysis of Rainfall-Runoff and Flood Inundation during the 2024 Heavy Rainfall Disaster in Noto Peninsula
★Invited Papers
Keywords:Heavy Rainfall Disaster in Noto Peninsula, Morphological change, Flood inundation, Climate change
In September 2024, heavy rainfall primarily affecting the northern part of the Noto Peninsula caused flooding in areas already impacted by the Noto Peninsula Earthquake in January of the same year, resulting in a complex disaster. As global warming progresses, concerns are rising over the increasing frequency and severity of extreme rainfall events. In the future, complex disasters, where earthquakes and heavy rainfall occur in close succession, are expected to become more common. Furthermore, it is essential to consider the possibility of chain-type compound disasters, in which an earthquake exacerbates the impact of a subsequent heavy rainfall event. If severe storms occur while the effects of a large-scale earthquake persist, it may amplify flood hazards. Various chain-type impacts can be considered, but this study focuses on the influence of earthquake-induced topographical changes on large-scale flooding.
The Noto Peninsula Earthquake has been reported to have caused coastal uplift of approximately 1 to 4 meters. These topographic changes in coastal areas may alter flood runoff patterns and the extent of flood inundation associated with heavy rainfall. To investigate this issue, we apply a physically-based hydrological model that integrates rainfall-runoff and flood inundation processes to simulate flooding in the northern Noto Peninsula. The model used in this study is the Rainfall-Runoff-Inundation (RRI) model, which covers the entire northern Noto Peninsula at a spatial resolution of 150 m. In particular, an improved version of the RRI model, which allows variable resolution for rainfall-runoff and flood inundation, is applied to more accurately simulate the localized effects of flooding. This study examines how uplift near the river mouth due to the earthquake influenced flood inundation by focusing on the downstream area of the Kawaradagawa river basin, whose outlet is located in Wajima city.
The Noto Peninsula Earthquake has been reported to have caused coastal uplift of approximately 1 to 4 meters. These topographic changes in coastal areas may alter flood runoff patterns and the extent of flood inundation associated with heavy rainfall. To investigate this issue, we apply a physically-based hydrological model that integrates rainfall-runoff and flood inundation processes to simulate flooding in the northern Noto Peninsula. The model used in this study is the Rainfall-Runoff-Inundation (RRI) model, which covers the entire northern Noto Peninsula at a spatial resolution of 150 m. In particular, an improved version of the RRI model, which allows variable resolution for rainfall-runoff and flood inundation, is applied to more accurately simulate the localized effects of flooding. This study examines how uplift near the river mouth due to the earthquake influenced flood inundation by focusing on the downstream area of the Kawaradagawa river basin, whose outlet is located in Wajima city.