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Regional Water Environment Systems Lab
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The lab portrays the water cycle of both nature and human activity as a single whole.
AboutAbout the lab
Using water resources wisely.
The Regional Water Environment Systems Lab studies integrated water resources management, which aims at the sustainable use of limited water resources.
Water is a precious resource, but it is unevenly distributed, abundant in some times and places and scarce in others.
The lab develops water resources management models that combine river flow, the exchange of water and heat between the land surface and the atmosphere, reservoir operation, and more.
The lab belongs to the Water Resources Research Center of the Disaster Prevention Research Institute, and its research also covers regions overseas, such as Kyrgyzstan and the Aral Sea.
Key terms
- Integrated water resources management
- An approach to managing water that considers the natural water cycle together with human water use, such as dams and water intake
- Land surface model
- A model that calculates how water and heat are exchanged between the land surface and the atmosphere
- Endorheic lake
- A lake with no outflowing river, whose size is determined by the balance between inflow and evaporation
ResearchResearch themes
The lab studies the concept of integrated water resources management so that development can be sustained despite social and economic change and climate change. Through field observation and numerical simulation, it understands and predicts the water cycle from the regional to the global scale.
*Illustrative imageDeveloping integrated water resources management models
The lab develops models that combine runoff, land surface processes, groundwater, water quality, crop growth, reservoir operation, socioeconomic factors, and more. By representing natural and artificial water cycles together, it aims to apply the models to assessing flood and drought risks.
*Illustrative imageImpacts of climate change on water resources
As global warming changes the amount and patterns of rainfall, and winter snow turns into rain, the way rivers flow may change greatly. Taking future social and climate scenarios into account, the lab assesses how much water will be available in the future in major rivers in Japan and around the world.
*Illustrative imageManaging groundwater wisely
Groundwater depletion is occurring in many parts of the world. By building the processes of groundwater recharge and pumping into a land surface model, the lab examines land use and groundwater pumping practices for sustainable water resources management.
*Illustrative imageWater balance of endorheic lakes
The sizes of lakes such as the Aral Sea and the Caspian Sea are maintained by the balance between inflow and evaporation. Focusing on the Aral Sea, whose shrinkage is severe, the lab builds a lake model and assesses how agricultural water use in the basin affects it.
MembersFaculty
The members of the Regional Water Environment Systems Lab are faculty, secretaries, researchers, and students in the doctoral, master's, and undergraduate programs.As of 2026
- ProfessorKenji Tanaka
- Associate ProfessorKazuaki Yorozu
- Program-Specific Associate ProfessorYoshiya Toge
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: “Inca canal at Pampacahuana” Sashimi-b / CC BY-SA 4.0 (cropped)
- Developing integrated water resources management models: “Lemon Reservoir, Colorado” Radomianin / CC BY-SA 4.0 (cropped)
- Impacts of climate change on water resources: “Day 185 - what California's drought conditions look like from the air” Judy Gallagher / CC BY 2.0 (cropped)
- Managing groundwater wisely: “Village pump Kells” A.-K. D. / CC BY-SA 4.0 (cropped)
- Water balance of endorheic lakes: “Historic Photos of the Aral Sea, Mo‘ynoq” Adam Harangozó / CC BY-SA 4.0 (cropped)
- Related lab (Hydrological Cycle Engineering Lab): “September 1988 Flood, Evacuations, Greymouth. CC321” John Charlton / CC BY-SA 4.0 (cropped)
- Related lab (Crustal Development Engineering Lab): “Hohlbohrkern” --Nightflyer 23:51, 27. Jun 2006 (CEST) / CC BY-SA 3.0 (cropped)
- Related lab (Hydrology and Water Resources Lab): “Leh-Manali Highway, Basin, Ladakh, India” Vyacheslav Argenberg / CC BY 4.0 (cropped)
- Related lab (River Basin Management Engineering Lab): “Bergtocht van S-charl naar Alp Sesvenna. . (d.j.b) 25” Dominicus Johannes Bergsma / CC BY-SA 4.0 (cropped)
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