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River Hydrology and Biogeochemistry Lab
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A lab that studies watershed environments by investigating water quality and habitats in forest mountain streams.
AboutAbout the lab
Reading watershed environments through the movement of water and materials in mountain streams.
Professor Tamao Kasahara of the Faculty of Interdisciplinary Science and Innovation specializes in river hydrology and biogeochemistry and studies the movement of water and materials in mountain streams and rivers in forests.
Mountain streams sometimes cause disasters, but they play various roles in the watershed, such as supplying water, sediment, and nutrients to downstream rivers and sustaining diverse organisms.
The lab's research examines how water quality in mountain streams is formed, the habitats of streams, and the effects that changes in the watershed environment and climate have on streams.
The lab also studies the movement of water and materials in the hyporheic zone, which extends beneath the streambed and where groundwater and river water mix, with the aim of contributing to the restoration of rivers and watersheds.
Key terms
- Hyporheic zone
- The zone that extends beneath the streambed, where groundwater and river water mix
- Organic matter decomposition
- The process in which organic matter in a stream is broken down by microorganisms and small aquatic animals
ResearchResearch themes
Mountain streams supply water, sediment, and nutrients to downstream rivers and sustain diverse organisms. The lab studies how water quality in mountain streams is formed, as well as processes such as organic matter decomposition in the hyporheic zone.
*Illustrative imageRoles of Spring-Fed Rivers
This research asks whether rivers sustained by spring water function as "cold infrastructure." The lab focuses on spring-fed rivers, the hyporheic zone, and headwater areas.
*Illustrative imageEffects of Abandoned Bamboo Forests on Rivers
The lab evaluates how abandoned bamboo forests affect river ecosystems, focusing on dissolved organic carbon (DOC), nutrients, water exchange in the hyporheic zone, and the decomposition of litter (such as fallen leaves).
*Illustrative imageNitrogen Dynamics and Mountain Stream Water Quality
Focusing on the movement of nitrogen, the lab uses processes that occur within stream channels as clues to investigate how water quality in mountain streams is formed.
*Illustrative imageEffects of Dam Reservoirs on the Hyporheic Zone
The lab investigates how dam reservoirs affect environmental variation in the hyporheic zone, focusing on seasonal variation.
MembersFaculty
- ProfessorTamao Kasahara
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: “Pangboche, Mountain stream, Nepal” Vyacheslav Argenberg / CC BY 4.0 (cropped)
- Roles of Spring-Fed Rivers: “A spring-fed tributary of the River Doe - geograph.org.uk - 7723222” Christine Johnstone / CC BY-SA 2.0 (cropped)
- Effects of Abandoned Bamboo Forests on Rivers: “Bamboo Forest, Arashiyama, Kyoto, Japan” Basile Morin / CC BY-SA 4.0 (cropped)
- Nitrogen Dynamics and Mountain Stream Water Quality: “Water Quality Sampling ( )” U.S. Fish and Wildlife Service - Midwest Region / Public domain (cropped)
- Effects of Dam Reservoirs on the Hyporheic Zone: “Idukki Dam Reservoir Hillview Pano Kerala Mar22 R16 05581-Pano” This Photo was taken by Timothy A. Gonsalves. Feel free to use my photos, but please mention me as the author. I would much appreciate if you send me an or write on my talk page, for my information. Please contact me before commercial use. Please do not upload an edited image here without consulting me. I would like to make corrections only at my own source to ensure that the changes improve the image and are preserved.Otherwise you may upload an edited image with a new name. Please use one of the templates derivative or extract. / CC BY-SA 4.0 (cropped)
- Related lab (Geochemistry Lab): “archaeological artifacts found in Biała” Silar / CC BY-SA 4.0 (cropped)
- Related lab (Geochemistry Lab): “Mantle Xenolith - geograph.org.uk - 3004602” Robert Stalham / CC BY-SA 2.0 (cropped)
- Related lab (Hydrology Lab): “Wakal River basin in Rajasthan and Gujarat states of India” Deccantrap / CC BY-SA 4.0 (cropped)
- Related lab (Hydrology (Satoshi Watanabe) Lab): “Friedberger Ach in Rain (Lech), April 2024 01” Calistemon / CC BY-SA 4.0 (cropped)
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