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Hydrology and Water Resources Lab
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The lab scientifically unravels the water cycle to build a better relationship between people and water.
AboutAbout the lab
Unraveling the water cycle from river basins to the globe
The Hydrology and Water Resources Lab scientifically investigates the flow and circulation of water and the accompanying transfer of heat and materials.
Our lives are deeply connected with water, from securing the safe water we need, to flood control during heavy rain, to developing comfortable waterfronts.
The lab develops simulation models that reproduce and predict, on computers, phenomena occurring at scales from river basins to the globe.
Using the models it has developed, the lab tackles the various problems that arise where the water cycle meets human society.
Key terms
- Hydrology
- The behavior of water as rain that falls flows over and under the ground and circulates to rivers, the sea, and the atmosphere
- Distributed runoff model
- A model that divides a river basin into small cells and calculates the flow of rainwater at each location to determine river discharge
- Particle filter
- A method that calculates many candidate states in parallel and retains those closer to the observations with greater weight, thereby incorporating observations and correcting predictions
NewsLab news
Papers by Prof. Tachikawa and colleagues published in Journal of Flood Risk Management
Papers by Prof. Tachikawa and colleagues published in Journal of Hydrology: Regional Studies
ResearchResearch themes
The lab scientifically and systematically clarifies the flow and circulation of water, and the accompanying heat and mass transfer, at scales from river basins to the globe, and develops models that reproduce and predict them on computers. By addressing problems that arise where the water cycle meets human social systems, the lab aims to build a better relationship between people and water.
*Illustrative imageUncovering How the Water Cycle Works
The lab investigates the physical mechanisms of the cycles of water, heat, and materials, and develops models that reproduce water movement in river basins and the exchange between the atmosphere and the land surface. The effects of human activities such as flow regulation by dams, water intake, and irrigation are also included.
*Illustrative imageRiver Planning and Real-Time Hydrological Forecasting
Based on an understanding of the water cycle, the lab develops foundational technologies for river planning and real-time hydrological forecasting. It works on real-time flood forecasting systems that use Kalman filters and particle filters.
*Illustrative imageHow Climate Change Will Alter Water Resources
To analyze the effects of climate change on the water cycle and water resources, the lab develops distributed runoff models that predict river discharge over long periods and wide areas.
*Illustrative imageCapturing the Global Circulation of Water
The lab develops land surface hydrological process models that can also represent human activities such as irrigation, estimates soil moisture and evapotranspiration, and investigates the mechanisms behind variations in the water cycle at the global scale.
MembersFaculty
The members of the Hydrology and Water Resources Lab are faculty, secretaries, international collaborating researchers, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorYasuto Tachikawa
- Assistant ProfessorTINUMBANG Aulia Febianda Anwar
- Assistant ProfessorSora Fugami
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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: “Leh-Manali Highway, Basin, Ladakh, India” Vyacheslav Argenberg / CC BY 4.0 (cropped)
- Uncovering How the Water Cycle Works: “The Water Cycle (SVS30580)” NASA's Scientific Visualization Studio - Marit Jentoft-Nilsen, Global Science and Technology, Inc./Deborah McLean / Public domain (cropped)
- River Planning and Real-Time Hydrological Forecasting: “Flooded building and tree trunk in the muddy water of the Mekong in Si Phan Don, Laos, September 2019” Basile Morin / CC BY-SA 4.0 (cropped)
- How Climate Change Will Alter Water Resources: “Llwyn-Onn Reservoir during drought (geograph 7291126)” Alan Hughes / CC BY-SA 2.0 (cropped)
- Capturing the Global Circulation of Water: “The Water Cycle (SVS30580)” NASA's Scientific Visualization Studio - Marit Jentoft-Nilsen, Global Science and Technology, Inc./Deborah McLean / Public domain (cropped)
- Related lab (水文循環工学): “September 1988 Flood, Evacuations, Greymouth. CC321” John Charlton / CC BY-SA 4.0 (cropped)
- Related lab (水環境工学): “ČBu, wastewater treatment plant 05” Czeva / CC BY-SA 4.0 (cropped)
- Related lab (大気・熱環境工学): “72,000 panel solar field at Nellis AFB” U.S. Air Force photo by Master Sgt. Robert Valenca / Public domain (cropped)
- Related lab (環境リスク工学): “Soilcontam” Dumelow / CC BY-SA 4.0 (cropped)
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