Kyushu University Academic Staff Educational and Research Activities Database
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KASAHARA TAMAO Last modified date:2024.06.03

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Academic Degree
Ph.D. in Physical Geography
Country of degree conferring institution (Overseas)
Yes Master Doctor
Field of Specialization
Stream and riparian hydrology and biogeochemistry
Total Priod of education and research career in the foreign country
Outline Activities
“Transient storage of water” is the key word in my research program. I study transient storage processes in systems at two different scales; watershed and stream/river. Processes slowing water movement though a watershed moderate flooding and impact of drought in the system. Transient storage processes in a stream play an important role in maintaining stream habitat and water quality.

My research program is developed on two primary objectives: 1) to understand mechanisms, quantity and timing at which water is temporally stored in watersheds, hillslopes, and stream/rivers by addressing physical and biological factors delaying water movement through the system, and 2) to understand the effects of water retention process on water quality and habitat quality of stream and river systems. One of my goals is to provide useful information for stream and watershed restoration through scientific research
Research Interests
  • Contribution of Instream Processes to Nitrogen Dynamics in Headwater Streams
    keyword : Nitrogen Dynamics, Hyporheic Exchange, Headwater
  • Changes in water quality after catastrophic disturbance in mountain streams with different lithology
    keyword : disturbance, mountain stream
  • Effects of dams on the hyporheic environment
    keyword : dam, reservoir, hyporheic zone, seasonal change
  • Rainfall-runoff processes in montane catchments
    keyword : runoff, montane catchment
  • Dynamics of the hyporheic zone, and the roles of the hyporheic zone in stream ecosystem
    keyword : hyporheic exchange, stream ecosystem
Academic Activities
1. Tamao Kasahara, Yanda Li, Aki Tanaka, Effects of dams and reservoirs on organic matter decomposition in the hyporheic zone in forest mountain streams, Hydrobiologia,, 849, 2949-2965, 2022.06.
2. Yanda Li, Tamao Kasahara, Masaaki Chiwa, Noboru Fujimoto, Effects of dams and reservoirs on organic matter decomposition in forested mountain streams in western Japan, River Research and Applications,, 36, 7, 991-1381, 2020.09.
1. Tamao Kasahara, Aki Tanaka , In-Stream Nitrate Retention in a Forest Mountain Stream with Elevated Nitrate Concentration in Western Japan
, American Geophysical Union Fall Meeting , 2023.12.