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)

12:00 PM - 12:15 PM

★ [HGM22-12] Distribution pattern and formation processes of potholes in Oshika, Tottori: role of pothole on river incision processes

*Yoshinori KODAMA1, Yuuki INOUE2 (1.Fac.of Regional Sciences, Tottori-Univ., 2.Under Graduate, Fac.of Regional Sciences, Tottori-Univ.)

Keywords:potholes, potohole developing processes, line distribution, river incision processes, balloon photoes, The Oshika River, Tottori, Japan

Potholes on the Oshika River bed near Takaganma, Misasa-Town, Tottori, Western Japan were surveyed. Surrounding terrace development revealed that there potholes were formed within 3,600 years. Plan view survey illustrated a line distribution pattern of potholes, resulting from longitudinal vortices generated in flood flows. Longitudinal profiles (Fig.) showed that bottom levels of potholes were close to or towards to those of the present river bed. In general, potholes have a role of effective drilling erosion on a hard bedrock elinimation with few sediment loads in the river incision processes.