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Water Environment Lab
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A lab that examines water quality and flooding in lakes, rivers, and seas through observation and analysis.
AboutAbout the lab
Reading water pollution and flooding through observation and analysis
The Water Environment Lab studies lakes, reservoirs, rivers, and coastal waters in agricultural and rural areas, with the aim of conserving the water environment and protecting regional water resources.
In addition to investigating the mechanisms by which organic pollution and eutrophication degrade water quality, the lab works on flood prediction in agricultural and rural areas and on evaluating how hydraulic structures mitigate floods.
The lab combines multiple methods, including field observation of water quality and hydraulics, laboratory experiments, numerical simulation, and the application of AI technologies.
The lab is divided into two groups: the Enclosed Water Bodies Group and the Coastal Waters and Rivers Group.
Key terms
- Organic pollution
- A water pollution phenomenon in which reduced water transparency triggers a progressive depletion of oxygen in the water
- Eutrophication
- A pollution phenomenon in which excess nutrients such as nitrogen and phosphorus enter a water body and cause mass growth of phytoplankton
- Oblique weir
- A weir built diagonally to the river flow. Its structure lowers water pressure, sends flood water quickly downstream, and prevents sediment from flowing in
ResearchResearch themes
The Water Environment Lab shares a common focus: quantitatively evaluating the mechanisms by which organic pollution and eutrophication degrade the water environment, and estimating and predicting the water environment of water bodies using mathematics and data science. The Enclosed Water Bodies Group works on developing technologies to improve and restore the water environment, while the Coastal Waters and Rivers Group works on developing flood prediction methods and quantifying the flood mitigation functions of hydraulic structures.
*Illustrative imageOrganic Pollution and Oxygen Depletion
The lab studies organic pollution in lakes and reservoirs, in which oxygen becomes depleted because turbid water blocks light and thermal stratification develops. Anoxia in particular is said to trigger a chain of serious water environment problems, and the lab conducts research that contributes to solving them.
*Illustrative imageEutrophication and Algal Blooms
The lab studies eutrophication, in which excess nitrogen and phosphorus flowing in from agricultural drainage, livestock barn wastewater, and domestic wastewater cause mass growth of phytoplankton. Abnormal growth of algae, such as cyanobacterial blooms, leads to deteriorating irrigation water quality and the loss of the multifunctional roles of water bodies.
*Illustrative imageEvaluating the Functions of Yamada Weir and Design Guidelines for Oblique Weirs
The lab evaluates the functions of Yamada Weir, built in the Edo period on the Chikugo River in Asakura, Fukuoka Prefecture, through sediment hydraulic analysis. Aiming to present design guidelines for oblique weirs, it also visualizes the flow around the weir through hydraulic experiments using PIV (particle image velocimetry).
*Illustrative imageIntegrated Land-Sea Management of Hakata Bay
Inflow loads from land and climate change are making environmental changes in coastal areas increasingly complex. Aiming at nutrient management in Hakata Bay, the lab takes a comprehensive view of the water cycle and material cycles from upstream land areas to the inner bay, and works toward building an integrated land-sea water environment management system that sets emission reduction targets for sewage treatment plants.
MembersFaculty
The members of the Water Environment Lab are faculty, students in the doctoral, master's, and undergraduate programs, and research students.As of 2025
- ProfessorMasayoshi Harada
- Associate ProfessorToshinori Tabata
- Associate ProfessorAkinori Ozaki
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: “Flood under the Old Route 49 bridge crossing over the South Yuba River in Nevada City, California” Kelly M. Grow/ California Department of Water Resources / Public domain (cropped)
- Organic Pollution and Oxygen Depletion: “USGS Mississippi River water sample Baton Rouge” Scott Dennis/USGS / Public domain (cropped)
- Eutrophication and Algal Blooms: “Cyanobacteria 032” Lamiot / CC BY-SA 3.0 (cropped)
- Evaluating the Functions of Yamada Weir and Design Guidelines for Oblique Weirs: “Weir on the River Wharfe at Otley - geograph.org.uk - 45975” David Spencer / CC BY-SA 2.0 (cropped)
- Integrated Land-Sea Management of Hakata Bay: “Ikinomatsubara Beach Ikinomatsubara-1-chōme Nishi-ku Fukuoka City 20221107” Hirho / CC BY-SA 4.0 (cropped)
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