Waseda University · Engineering
Professor Tomoyuki Takabatake's research lab specializes in coastal hazard mitigation, with a primary focus on tsunami and storm surge dynamics, particularly those generated by landslides and extreme weather events. The lab conducts integrated field surveys, laboratory experiments, and numerical simulations to understand tsunami propagation, inundation behavior, and human evacuation responses. Key research directions include landslide-generated tsunamis—especially partially submerged and subaerial types—and the development of predictive models and evacuation optimization strategies using advanced computational techniques such as agent-based modeling and reinforcement learning. The lab also investigates the influence of coastal urban structures on tsunami flow and the effectiveness of community-level disaster preparedness and awareness.
Figures are computed from collected data and may differ slightly.
On the 22nd of December 2018 the shorelines of Sunda Strait, Indonesia, were hit by tsunami waves generated by the flank collapse of the Anak Krakatau volcano. The authors conducted a field survey of the affected areas in both Sumatra and Java islands to collect information on tsunami inundation and run-up heights, damage patterns at each coastal community, and the evacuation behaviour and tsunami awareness of the affected people. The survey results showed that in Sumatra island inundation heigh
Typhoon Jebi struck Japan on the 4 September 2018, damaging and inundating many coastal areas along Osaka Bay due to the high winds, a storm surge, and wind driven waves. In order to understand the various damage mechanisms, the authors conducted a field survey two days after the typhoon made landfall, measuring inundation heights and depths at several locations in Hyogo Prefecture. The survey results showed that 0.18–1.27 m inundation depths were caused by Typhoon Jebi. As parts of the survey,
In the present study, three different types of landslide-generated tsunamis (subaerial, partially submerged and submarine) were investigated through laboratory experiments that used 261 different experimental conditions. The results show that, for the near-field region, the subaerial landslide generated a higher leading wave, while the submarine landslide generated a higher second wave. However, frequency dispersion considerably influenced their propagation, with the leading wave decaying and th
Abstract Massive landslides can generate large tsunamis and endanger human lives and properties. While a number of laboratory experiments on either subaerial or submarine landslide‐tsunamis have been conducted, few studies have focused on partially submerged events. The present study aimed to investigate the characteristics of partially submerged landslide‐tsunamis and to develop a predictive equation that can estimate their heights through three‐dimensional laboratory experiments that used 114
Inland tsunami flows can be greatly affected by the presence of coastal buildings. The present study experimentally and numerically investigated the effects of nine different building layouts on 1) the tsunami inundation process and spatial velocity distribution, 2) the flow depth and velocity at a specific point, and 3) the extent of the area where shielding effects take place. High-speed video footage, PIV analysis, and the time history of flow depth, surface velocity and momentum flux demonst
Evacuation path optimization during major flooding events is crucial for minimizing casualties. Notably, recent studies have underscored the importance of considering multiple factors, such as inundation timing, road congestion, and evacuation destination capacities, during path optimization for effective flood evacuation planning. Drawing insights from these studies, the present study developed a novel methodology to optimize evacuation paths for individual evacuees by integrating agent-based t
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