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Nihei Lab
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A lab that investigates water disasters such as floods, and water environments, through field observation and numerical simulation.
AboutAbout the lab
Reading the movement of natural waters through measurement and computation.
The Nihei Lab (called the Hydraulics Lab on its website) studies fluid motion in natural water bodies such as rivers, lakes, and oceans, and the environmental phenomena linked to it.
Its goals are to clarify actual conditions, establish prediction methods, and improve and restore the environmental problems occurring there.
The lab takes its own measurements through field observation and remote sensing, and runs numerical simulations on computers to reproduce and predict phenomena in the field.
The lab places importance on students going to the field as much as possible to experience environmental phenomena firsthand, and sometimes building their own environmental measuring instruments for monitoring.
Key terms
- Multiphase turbulence model
- A numerical model of flow that can handle both water (liquid phase) and soil particles (solid phase).
- Local scour at bridge piers
- The phenomenon in which the riverbed in front of a bridge pier is eroded. It can cause damage such as piers tilting or collapsing.
- Hy2-3D model
- A model that combines two-dimensional and three-dimensional computation to reproduce three-dimensional flow while reducing computational load.
ResearchResearch themes
The lab develops simulation models at scales ranging from a single grain of sand to an entire river basin, with practical application in mind, aiming to make them usable by a wide range of researchers and engineers. It also studies multi-hazards, microplastics, and the atmospheric, marine, and river environments.
*Illustrative imageElucidating the mechanism of scour around bridge piers
The lab investigates local scour at bridge piers, which accounts for most of the bridge damage caused by heavy rain, using GAL-LES, a multiphase turbulence model that handles both water and soil particles. The computation captured the time evolution of the scour shape, which broadly agreed with the scour observed in experiments.
*Illustrative imageConditions under which cars are swept away by floods
Using experiments with actual vehicles, the lab investigates the conditions under which a car is swept away in flood inundation flow. When the handbrake was not applied, the car was swept away at a flow velocity of about 1 m/s and a water depth of about 0.3 m, far lower than the velocity and depth at which it was swept away with the brake applied.
*Illustrative imageMeasuring trees in river channels with LiDAR
Because trees in river channels create resistance to flow during floods, the lab uses LiDAR to estimate the three-dimensional distribution and projected area of trees on floodplains. Field observation has been conducted on the Edo River since fiscal 2024.
*Illustrative imageA three-dimensional river flow model with reduced computational load
The lab is developing the Hy2-3D model, which combines two-dimensional and three-dimensional computation to reproduce the three-dimensional flows that become complex in large-scale floods. Applied to the July 2020 flood of the Kuma River, it has been shown to reproduce three-dimensional flow.
MembersFaculty
The Nihei Lab consists of faculty members, research fellows, secretaries, analysis assistants, and doctoral, master's, and undergraduate students.
- ProfessorYasuo Nihei
- LecturerJin Kashiwada
- Assistant ProfessorMamoru Tanaka
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Flowerdale River at Meunna, Tasmania, Australia” NeoGeneric / CC BY-SA 4.0 (cropped)
- Elucidating the mechanism of scour around bridge piers: “I-35W Bridge 2” Elkman / CC BY-SA 3.0 (cropped)
- Conditions under which cars are swept away by floods: “Flooded Croft Road car park - geograph.org.uk - 7104640” Philip Halling / CC BY-SA 2.0 (cropped)
- Measuring trees in river channels with LiDAR: “California LiDAR Diablo Canyon Road” Rebecca equator / CC BY-SA 4.0 (cropped)
- A three-dimensional river flow model with reduced computational load: “Wilkin River close to its confluence with Makarora River, Otago, New Zealand” Michal Klajban / CC BY-SA 4.0 (cropped)
- Related lab (塚本研究室): “Soil liquefaction 4,Katori-city,Japan” katorisi / CC BY-SA 3.0 (cropped)
- Related lab (榎本研究室): “Landslide Seba Beach” Quinn Desilets / CC BY-SA 4.0 (cropped)
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