Japan Geoscience Union Meeting 2016

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Symbol A (Atmospheric and Hydrospheric Sciences) » A-HW Hydrology & Water Environment

[A-HW16] Water and material transport and cycles in catchment ecosystems: from headwater to coastal area

Thu. May 26, 2016 9:00 AM - 10:30 AM 302 (3F)

Convener:*Seiko Yoshikawa(Narional Institute for Agro-Environmental Sciences), Masahiro Kobayashi(Forestry and Forest Products Research Institute), Noboru Okuda(Research Institute for Humanity and Nature), Shin-ichi Onodera(Graduate School of Integrated and Arts Sciences, Hiroshima University), Kazuhisa Chikita(Department of Earth and Planetary Sciences, Faculty of Science, Hokkaido University), Tomohisa Irino(Faculty of Environmental Earth Science, Hokkaido University), Shinji Nakaya(Department of Water Environment and Civil Engineering, Faculty of Engineering, Shinshu University), Mitsuyo Saito(Graduate School of Environmental and Life Science, Okayama University), Chair:Shin-ichi Onodera(Graduate School of Integrated and Arts Sciences, Hiroshima University), Mitsuyo Saito(Graduate School of Environmental and Life Science, Okayama University)

9:00 AM - 9:15 AM

[AHW16-01] Runoff and erosion processes in a forested river catchment

*Kazuhisa Chikita1, Daisuke Yanaba2, Yoshitaka Sakata3, Md Motaleb Hossain1 (1.Department of Earth and Planetary Sciences, Faculty of Science, Hokkaido University, 2.Department of Earth and Planetary Sciences, School of Science, Hokkaido University, 3.Department of Space System, Faculty of Engineering, Hokkaido University)

Keywords:forest slope, tephra layer, saturated throughflow

Behaviors of rainwater in the forest soil layer and its associated erosion processes were explored in the forested Oikamanai River catchment, Hokkaido, by setting a 4CH soil moisture profiler (10 - 40 cm depth) and five tensiometers (10 – 50 cm depth) in the rainfall season of 2015. Water budget of the soil layer were estimated for some rainfall events in forest. As a result, a rainfall of total 58.0 mm in forest produced saturated throughflow in the tephra layer (Tarumae 1667 Ta-b) at 30 - 40 cm depth, which exhibited the high potentiality for eroding sand and mud grains.