Japan Geoscience Union Meeting 2019

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[J] Poster

H (Human Geosciences ) » H-CG Complex & General

[H-CG32] Interdisciplinary approach to earth surface processes related to deposition, erosion and sediment transport

Sun. May 26, 2019 10:45 AM - 12:15 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Koji Seike(Geological Survey of Japan, AIST), Naofumi Yamaguchi(Center for Water Environment Studies, Ibaraki University), Hajime Naruse(Department of Geology and Mineralogy, Graduate School of Science, Kyoto University), Hideko Takayanagi(Institute of Geology and Paleontology, Graduate School of Science, Tohoku University)

[HCG32-P02] A meander bar in the upper Koito River changed by floods

*Hiroko Okazaki1 (1.Division of ecology & environmentology, Natural History and Institute, Chiba)

Keywords:meander bar, Koito River, flood

A meander bar is observed in the upper Koito River in the Boso Hills, Chiba Prefecture, central Japan. The study area of Boso Hills consist of alternations of sandstones and mudstones of the late Miocene Amatsu Formation. The upper Koito River is a plane-bed bedrock river and forms an incised meander. The bar distinctly was enlarged by lateral accretions and an increasing downstream of larger gravels during the floods caused by typhoons in autumn of 2017.