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Hydraulic Environmental Dynamics Lab
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The lab uncovers how sand moves on river and sea beds through both measurement and computation.
AboutAbout the lab
Sediment hydraulics and multiphase turbulence measurement
The Hydraulic Environmental Dynamics Lab studies how sand on river and sea beds is moved by flow.
A river or sea bed where sand moves is called a movable bed, and there water and sand grains mix to form a complex, turbulent flow.
Through both measurements of multiphase turbulence in hydraulic experiments and simulations of multiphase flow, the lab investigates what happens at the interface of the movable bed.
Noting that the flow of grains resembles the movement of human crowds, the lab also works on predicting crowd flow using granular material models.
Key terms
- Movable bed
- The bed of a river or sea where sand is moved by flow
- Multiphase turbulent flow
- A state in which materials with different properties, such as water and sand grains, flow turbulently while remaining mixed
- Granular material model
- A model that follows grains such as sand particles one by one and calculates the movement of the whole assembly
NewsLab news
The professor and assistant professors, among others, received the JAMSTEC Nakanishi Award from the Japan Society of Ocean Engineering
Assistant Professor Takumi Tazaki received the 2024 Hydraulic Engineering Paper Encouragement Award
The professor and assistant professors, among others, received the Coastal Engineering Journal Award of 2023
ResearchResearch themes
To understand how sediment is transported by fluvial and coastal sediment transport, multiphase turbulence, the motion of sand particles, and the movable bed boundary must be understood as one mechanism. Through both measurements of multiphase turbulence and multiphase flow simulations, the lab seeks to capture the mechanisms of flow that arise at the movable bed interface.
*Illustrative imageA Numerical Movable Bed Tracking Every Sand Grain
The sand particles that form river and coastal beds move under strong influence from the surrounding flow. The lab runs numerical simulations that track individual sand particles with a granular material model while evaluating the flow field at a comparable resolution.
*Illustrative imageMeasuring Turbulence in Mixed Flows
To understand how sand particles are transported, information on the turbulence immediately above the movable bed is needed. Alongside numerical simulations, the lab conducts fundamental hydraulic experiments and focuses on capturing the multiphase turbulent flow field using PIV.
*Illustrative imageCalculating River Flow and Riverbed Change
For the flow and sediment transport needed in river planning, the lab grasps the phenomena through physical model experiments and develops numerical simulation methods.
MembersFaculty
The members of the Hydraulic Environmental Dynamics Lab are faculty and doctoral, master's, and undergraduate students.
- ProfessorEiji Harada
- Associate ProfessorShinichiro Onda
- Assistant ProfessorTakumi Tazaki
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: “Kruger National Park (ZA), Sand River” Dietmar Rabich / CC BY-SA 4.0 (cropped)
- A Numerical Movable Bed Tracking Every Sand Grain: “Macrophotography of grains of sand in polarised ligth” Jojowikiscience / CC BY-SA 4.0 (cropped)
- Measuring Turbulence in Mixed Flows: “Turbulent flow below Yair Bridge - geograph.org.uk - 6808202” Jim Barton / CC BY-SA 2.0 (cropped)
- Calculating River Flow and Riverbed Change: “Malad River Overlook Panorama” Chris Light / CC BY-SA 4.0 (cropped)
- Related lab (Coastal Urban Design Lab): “North Shore Trip - Oct 2017 - Waves Crashing Over the Two Harbors Breakwater ( )” Pete Markham from Loretto, USA / CC BY-SA 2.0 (cropped)
- Related lab (Erosion and Sediment Control Engineering Lab): “Debris flow lawina 4” Mirosław Mrozik / CC BY-SA 4.0 (cropped)
- Related lab (Structural Dynamics Lab): “Earthquake proof! (mcpherson-fig2)” ESO / CC BY 4.0 (cropped)
- Related lab (Hydrology and Water Resources Lab): “Leh-Manali Highway, Basin, Ladakh, India” Vyacheslav Argenberg / CC BY 4.0 (cropped)
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