Author(s): Takuno Tomoki; Akoh Ryosuke; Maeno Shiro
Linked Author(s): Ryosuke Akoh
Keywords: Basin-wide flood control flood inundation simulation paddy field dams pre-drainage
Abstract: This study evaluates the effectiveness of combined flood control measures in the Karube River Basin, with a particular focus on the impact of paddy field dams and pre-drainage strategies. The increasing frequency and intensity of large-scale disasters in Japan, compounded by climate change, necessitate the enhancement of flood management approaches. The study employed both historical rainfall data from the 2018 Western Japan Flood and the 2021 Heavy Rain, as well as synthetic rainfall scenarios, to simulate flood events. The results showed that paddy field dams significantly reduce inundation depths, especially in downstream areas where drainage capacity is limited. Additionally, pre-drainage, which involves lowering water levels ahead of floods, was found to delay inundation and reduce peak flows, particularly when used in combination with paddy field dams. This combination presents an effective flood control strategy, particularly for small to medium-sized river basins, and supports the adoption of basin-wide flood management practices. The findings emphasize the potential for integrating these measures into broader flood mitigation efforts.
Year: 2025