Japan Geoscience Union Meeting 2014

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Symbol H (Human Geosciences) » H-GM Geomorphology

[H-GM22_30AM2] Geomorphology

Wed. Apr 30, 2014 11:00 AM - 12:45 PM 422 (4F)

Convener:*Hiroshi Shimazu(Department of Geography, Faculty of Geo-Environmental Science, Rissho University), Chiaki T. Oguchi(Geosphere Research Institute, Saitama University), Masayuki Seto(Fukushima Future Center for Regional Revitalization, Fukushima University), Chair:Masayuki Seto(Fukushima Future Center for Regional Revitalization, Fukushima University)

11:30 AM - 11:45 AM

[HGM22-10] Basin-averaged erosion rates of Yakushima using cosmogenic 10Be in river sediments

*Kazuyo SHIROYA1, Yuki MATSUSHI2, Hiroyuki MATSUZAKI3 (1.Geological Survey of Japan, AIST, 2.Disaster Prevention Research Institute, Kyoto University, 3.Department of Nuclear Engineering and Management, School of Engineering, The University of Tokyo)

Keywords:Yakushima, Basin-averaged erosion rate, precipitation, cosmogenic Be-10

Quantitative understanding of erosion rates under several geomorphic and geological settings is important to discuss the process of erosion. We investigated basin-averaged erosion rates from cosmogenic 10Be in quartz grains from river sediments in Yakushima. Erosion rates in Yakushima are relatively low within a similar range to those in regions of several times lower rainfall than Yakushima. This finding suggests that rainfall is not necessarily a causal factor of landform evolution. In this presentation, we focus on a pattern of hillslope erosion and a process of landform evolution in Yakushima.This research project has been conductedas the regulatory supporting research funded by the Secretariat of Nuclear Regulation Authority (Secretariat of NRA), Japan.