Japan Geoscience Union Meeting 2022

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[J] Poster

H (Human Geosciences ) » H-GM Geomorphology

[H-GM03] Geomorphology

Mon. May 30, 2022 11:00 AM - 1:00 PM Online Poster Zoom Room (11) (Ch.11)

convener:Hitoshi SAITO(College of Economics, Kanto Gakuin University), convener:Tsuyoshi Hattanji(Faculty of Life and Environmental Sciences, University of Tsukuba), Thomas Parkner(University of Tsukuba, Graduate School of Life and Environmental Sciences), convener:Naoko Nagumo(International Centre for Water Hazard and Risk Management, Public Works Research Institute), Chairperson:Naoko Nagumo(International Centre for Water Hazard and Risk Management, Public Works Research Institute)


11:00 AM - 1:00 PM

[HGM03-P03] Landform Analyses of Granite Mountains in Northeast Japan: Reconsideration of Uplifted Peneplain in Abukuma Mountains.

*Taichi Hiraoka1, Takayuki Ogata1 (1.Graduate School of Engineering and Science, University of the Ryukyus )

Keywords:uplifted peneplain, cycle of erosion, granite, Abukuma mountains

Uplifted peneplain is a geomorphic stage of the classical model of “cycle of erosion” produced by W. M. Davis, whereas geomorphology should reconsider this model based on quantitative landform analyses. This study discusses low-relief landforms considered as uplifted peneplains in Abukuma mountains, northeast Japan. GIS analyses were undertaken using DEM10A data by GSI (Geospatial Information Authority of Japan) in the Nitta, Takase and Natsui river basins located in the Abukuma mountains. Longitudinal profiles indicate many knick-zones along the three rivers at the edges of the low-relief surfaces defined as boundaries between gentle and steep slope areas. These knick-zones range from 260 m to 420 m in elevation and are situated at variously geological settings. GIS analyses show the various elevation of ridge lines even in each basin, which suggests different geomorphological formation to the cycle of erosion.