The Process of Raised-Bed River Formation and Factors that Affect It

Natsuki KAMISASA, Yuta KONDO, Haruto TAKEYAMA, Yasuharu TOMITA, Rikushi NAGAO, Naka NOHAMA

Presentation information

[J] Poster

O (Public ) » Public

[O-07] Poster presentations by senior high school students

Sun. Jun 6, 2021 1:45 PM - 3:15 PM Ch.27

convener:Tatsuhiko Hara(International Institute of Seismology and Earthquake Engineering, Building Research Institute), Katsuyoshi Michibayashi(Department of Earth and Planetary Sciences, Nagoya University), Miwa Kuri(Japan Meteorological Agency), Keiko Konya(Japan Agency for Marine-Earth Science and Technology)

1:45 PM - 3:15 PM

[O07-P27] The Process of Raised-Bed River Formation and Factors that Affect It

*Natsuki KAMISASA¹, *Yuta KONDO¹, *Haruto TAKEYAMA¹, *Yasuharu TOMITA¹, *Rikushi NAGAO¹, *Naka NOHAMA¹ (1.Hyogo Prefectural Kakogawa Higashi High School)

Keywords:raised-bed river, alluvial fan, cross-sectional view, longitudinal view, overhead view

In this study, features of raised-bed rivers in Japan were measured using GSI Maps and some other kinds of maps in order to clarify ‘in what kinds of areas’ and ‘how’ raised-bed rivers are formed. As a result, two things were found; 1.The bed of a raised-bed river rises as sediment accumulates near the point at which the slope greatly changes so that the slope becomes more gentle, and that point moves downstream as the riverbed rises over time. 2.Some raised-bed rivers are wide in the upstream alluvial fan sections and get narrower in the downstream floodplain sections. It became clear that the formation of raised-bed rivers is related not only to human influence but also to landforms.