Dynamic changes of longitudinal river profiles based on geomorphological and sedimentological analysis

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K16284
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Geography
• Research Institution: National Institute of Advanced Industrial Science and Technology (2017); Chuo University (2015-2016)
• Principal Investigator: OGAMI Takashi 国立研究開発法人産業技術総合研究所, 地質調査総合センター, 主任研究員 (30573191)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 河床縦断面形 / 河川遷急点 / 地形解析 / 堆積勾配 / 隆起速度 / 侵食速度 / 津波遡上 / ストリームパワー侵食モデル

Outline of Final Research Achievements

This study focused on dynamic changes of transient landscapes controlled by bedrock river incision. From case study about rivers of Sanriku coast, northeast Japan, I developed regression model of river knickpoints based on stream power incision model. Constrained by geological and geomorphological data, I calculated horizontal migration rates of river knickpoints and vertical incision rates of bedrock rivers. From case study about rivers of Yoro mountains, central Japan, I demonstrated relationship among tectonic uplift-rate, river steepness of bedrock river-channel and dip of depositional surface. Owing to obtained data set of rivers, I compared tsunami inundation area and run-up heights with river profiles. I demonstrated that the onshore topography, especially longitudinal river-profile, strongly controlled tsunami run-up heights and inundation distances.

Free Research Field

地理学