105m wave flume

The 105m wave flume is the oldest facility owned by the institute, established in 1955. This facility allows for the functional study of coastal structures such as breakwaters and seawalls through medium-scale model experiments. It's also utilized for various model experiments related to wave-dissipating blocks, piles, and other structures.

Main Specifications
Flume: 105.0m long × 3.0m wide × 2.5m deep
Wave Generator (with absorbing control, Piston-type wavemaker)
　　　Regular or irregular waves: H_max=0.8m, 0.5s<T<10.0s
Other Equipment: Solitary waves, Bore wave generator, current pump, upwelling current generator

Large Hydro-Geo Flume(LHGF)

Model experiments are used to understand phenomena by reducing the scale of the actual site, but experiments using small models may not accurately reproduce actual phenomena because the properties of sand and structures differ from those at the actual site.
This facility is a large flume capable of generating the world's largest waves, 3.5-meter wind waves and tsunami waves equivalent to a maximum of 2.5 meters, making it a rare experimental facility worldwide. The channel measures 184 meters in length, 3.5 meters in width, and 12 meters in depth, with a distinctive 4-meter-deep sandy soil layer. This channel enables experiments at nearly full scale, including the reproduction of ground movement and structural damage processes that were problematic in small-scale model experiments.
Using this experimental facility, research is being conducted on the prevention and mitigation of disasters caused by tsunamis, high tides, and high waves, which can have a significant impact on the lives and property of the public.

Main Specifications
Flume: 184m long × 3.5m wide × 12m deep
Wave Generator (with absorbing control, Piston-type wavemaker)
　　　Regular or irregular waves: H_max=3.5m (h=7.5m)
　　　Solitary Waves: H_max=2.5m
Other Equipment: current pump (both direction), single-direction shaking table

Comprehensive anti-disaster experiment facility

This comprehensive experimental facility is equipped with piston-type and flap-type wave-making devices (wave-making water depth 1.8 m) and a recirculation device in a quasi-three-dimensional large-scale hydraulic model test tank, enabling the reproduction of the destruction and deformation processes of breakwaters, revetments, and other facilities, and the rapid elucidation of mechanisms and formulation of countermeasures. Completed in fiscal 2011.

Main Specifications
Flume: 50m long × 10m wide × 2m deep
Wave Generator (with absorbing control, Piston-flap combined wavemaker)
　　　Regular or irregular waves: H_max=0.7m
　　　Solitary Waves:  H_max=0.5m (h=1.8m)
Other Equipment: current pump (both direction)