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Hydrosphere Disaster Prevention and Environment Lab
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The lab uses numerical models to reproduce river flow and the resulting changes in landforms.
AboutAbout the lab
Uncovering river landform change through numerical models
The Hydrosphere Disaster Prevention and Environment Lab studies river flow and the changes in landforms that it causes.
Centered on rivers but also covering river mouths and the seafloor, the lab is interested in how land-surface topography changes through the movement of water and sediment.
The lab builds numerical models ranging from one to three dimensions and uses computation to reproduce riverbed landforms such as sand bars, as well as the movement of driftwood.
Its research fields include river engineering, hydraulic engineering, and sediment hydraulics, as well as hydrology such as flood prediction, and disaster prevention education.
Key terms
- Morphodynamics
- How the shape of a riverbed or land surface changes over time through the movement of water and sediment
- Sand bar
- A slightly raised area, higher than its surroundings, formed by sand and gravel accumulating on a riverbed
- Bedform
- A wave-like pattern of ridges and troughs formed on a riverbed by the flow
ResearchResearch themes
The lab studies the morphodynamics of the land surface, centered on rivers but also covering river mouths and the seafloor. It uses numerical models to reproduce the movement of sand bars and bedforms, and the transport and deposition of driftwood.
*Illustrative imageComputing land-surface morphodynamics
Interested in the morphodynamics of the land surface, centered on rivers and including river mouth and seafloor environments, the lab applies a variety of numerical models to these phenomena.
*Illustrative imageSand bars, bedforms, and how they interact
Sand bars and bedforms are fundamental elements of river topography, and ones with different origins and sizes can appear at the same time. The lab has developed several one-, two-, and three-dimensional numerical models and uses them to reproduce the movement of bedforms in rivers.
*Illustrative imageTransport and deposition of driftwood in rivers
How much driftwood accumulates in a river is important for understanding the amount of driftwood in an entire watershed, but it is difficult to measure in the field. Using numerical simulations of driftwood deposition in river reaches with sandy beds, the lab investigates the role that large-scale bed features such as alternate bars and braided flow play in trapping driftwood.
MembersFaculty
- Associate ProfessorToshiki Iwasaki
- Assistant ProfessorGaku Tanaka
- Assistant ProfessorSoichi Tanabe
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: “Satsunai River” Ozizo / Public domain (cropped)
- Computing land-surface morphodynamics: “Mackenzie River Delta, Canada (ASTER)” NASA/METI/AIST/Japan Space Systems, and U.S./Japan ASTER Science Team / Public domain (cropped)
- Sand bars, bedforms, and how they interact: “Abe River 20120929” Batholith / Public domain (cropped)
- Transport and deposition of driftwood in rivers: “Old log jam along Ohanapecosh River. (aae9c6cd3e794cce90b0d66fea13cb9e)” Steve Redman (MORA) / Public domain (cropped)
- Related lab (River and Watershed Engineering Lab): “Takikawa view from glider” Soica2001 (talk) / Public domain (cropped)
- Related lab (Coastal and Ocean Engineering Lab): “Plunging breaker (Sand Beach, Mt. Desert Island, Maine, USA) 15” James St. John / CC BY 2.0 (cropped)
- Related lab (Geoenvironmental Analysis Lab): “Frost heaves on Bragg Hill Road in Norwich Vermont in March 2012--A” Stephen N. Flanders / CC BY-SA 4.0 (cropped)
- Related lab (Resource Chemistry Lab): “Rio tinto river CarolStoker NASA Ames Research Center” Carol Stoker, NASA / Public domain (cropped)
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