Japan Geoscience Union Meeting 2019

Presentation information

[J] Oral

H (Human Geosciences ) » H-GM Geomorphology

[H-GM04] Geomorphology

Wed. May 29, 2019 9:00 AM - 10:30 AM 101 (1F)

convener:Tsuyoshi Hattanji(Faculty of Life and Environmental Sciences, University of Tsukuba), Masayuki Seto(Fukushima Future Center for Regional Revitalization, Fukushima University), Chairperson:Tsuyoshi Hattanji

9:45 AM - 10:00 AM

[HGM04-04] Influence of lithology on production and transport of soils on hillslopes underlain by granite and hornfels

*Takuma Watakabe1, Yuki Matsushi2, Hiroyuki Matsuzaki3 (1.Graduate School of Science, Kyoto University, 2.Disaster Prevention Research Institute, Kyoto University, 3.The University Museum, The University of Tokyo)

Keywords:Soil production rate, Soil transport coefficient, Cosmogenic nuclides, Geotechnical properties

We measured rates of soil production and transport using cosmogenic 10Be and measured characteristics of soil properties in hillslopes underlain by granite and hornfels in Shirakawa watershed, eastern Kyoto City. Rates of soil production and transport of the granite hillslope were faster than those of the hornfels hillslope. Soil on the granite hillslope was incohesive sand with large saturated hydraulic conductivity and low water retention ability. In contrast, soil on the hornfels hillslope was cohesive sand with low saturated hydraulic conductivity and high water retention ability. Characteristics of the granite soil promote wet–dry weathering effect in the shallow subsurface materials of the granite hillslope. Thus, physical, mechanical, and hydrological properties of soils on each bedrock control the rates of soil production and transport.