Japan Geoscience Union Meeting 2015

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International Session (Oral)

Symbol H (Human Geosciences) » H-GM Geomorphology

[H-GM02] Geomorphology

Tue. May 26, 2015 11:00 AM - 12:45 PM 101B (1F)

Convener:*Hiroshi Shimazu(Department of Geography, Faculty of Geo-Environmental Science, Rissho University), Chiaki T. Oguchi(Institute for Environmental Science and Technology, Graduate School of Science and Engineering, Saitama University), Masayuki Seto(Fukushima Future Center for Regional Revitalization, Fukushima University), Chair:Shoichi Hachinohe(Center for Environmental Science in Saitama), Hiroshi Shimazu(Department of Geography, Faculty of Geo-Environmental Science, Rissho University)

12:00 PM - 12:03 PM

[HGM02-P01] Measurement of changes in wall surface morphology in Yoshimi-Hyakuana cave by terrestrial laser scanning

3-min talk in an oral session

*Yuichi S. HAYAKAWA1, Chiaki T. OGUCHI2, Natsuki ARIGA3, Hisashi AOKI3 (1.Univ. Tokyo, 2.Saitama Univ., 3.Tokyo Gakugei Univ.)

Detection and quantitative evaluation of changes in surface morphology of rocks are crucial issue for the understanding of processes of weathering. Using terrestrial laser scanning (TLS) approach, detailed topographic measurements of wall surface morphology were performed repeatedly at a test site of Yoshimi-Hyakuana cave in Saitama Prefecture, central Japan. Time series of point clouds and digital elevation models (DEMs) were compared to each other, revealing the locations of centimeter-scale changes in the wall surface, likely induced by salt weathering. The spatial distribution of such surficial changes will be further assessed by continuous measurements, with appropriate accuracy assessments.