Reduce flood damage and create rivers with diverse ecosystems!
Social Infrastructure (Saitama University Research Seed Collection 2025-27 p.10)
Keywords: Disaster reduction, Eco-DRR, green infrastructure, flood inundation, evacuation analysis, riparian vegetation, river management, hydraulic experiments, numerical analysis, disaster investigation.
The impact of climate change is causing frequent river flooding. While we are excavating and enlarging rivers, it is also necessary to increase areas with diverse biological communities in rivers and their surrounding watersheds to achieve nature-positive outcomes. Green infrastructure (such as wetlands, rice paddies, and forest belts) also has functions that reduce disaster risk, so I am interested in how to mix natural elements with artificial structures (such as levees and retention basins) to create a good state for both disaster reduction and ecosystems. Additionally, focusing on the Arakawa River basin, I am conducting research to clarify the changes in flood risk associated with flood control projects in Saitama Prefecture and to accurately estimate flood hazard areas and evacuation timing. I am also researching countermeasures to delay levee breaches caused by infiltration and overtopping within levees and foundational ground, as well as considering the impact of river flow on levee erosion and the interaction between river vegetation and water flow on the long-term maintenance of river channels, all while exploring how to create diverse biological habitats.
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basic information
Professor Norio Tanaka Department of Environmental and Social Infrastructure, Graduate School of Science and Technology 【Recent Research Themes】 ● Research on countermeasures to make river levees resilient against overtopping ● Clarification of the impact of vegetation within river channels on erosion, sedimentation, and driftwood formation, and proposals for countermeasures ● Research on the clarification of local flood risk and evaluation methods for the effectiveness of retention and infiltration measures ● River flooding and the timing of resident evacuations
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Applications/Examples of results
【Appeal Points to the Industry】 ● A comprehensive set of hydraulic experiment facilities (4 wave generation devices including tsunami conditions, 3 flume experiment facilities (variable slope, wide width, flat), 1 wind tunnel experiment facility) and experimental equipment (flow visualization (PIV) equipment, laser Doppler velocimeter (LDV) equipment, acoustic Doppler velocimeter (ADV), force gauges, etc.), and on-site observation instruments. ● Proposals for disaster reduction-oriented urban development based on tsunami inundation and river flood analysis. ● Evacuation analysis using agent-based models. 【Examples of Practical Application, Utilization, and Implementation】 ● Proposals and social implementation for the coastal disaster prevention forest pilot project in Hokkaido. ● Proposals for the reconstruction of Otsuchi Town. ● Visualization methods for flood risk. ● Construction methods to delay levee failure against overflow and infiltration.
Detailed information
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Resident evacuation analysis during flooding (linked with flood inundation simulation)
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The Saitama University Open Innovation Center is a center that functions as a liaison office for industry-academia-government collaboration. It consists of three departments: the Industry-Academia-Government Collaboration Department, the Intellectual Property Department, and the Startup Support Department, each staffed with coordinators well-versed in various fields. The center's activities include solving technical challenges in companies, supporting the implementation of joint research, and conducting technology transfer aimed at introducing and utilizing Saitama University's intellectual property.
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