Dynamics of longitudinal river profiles associated with knickpoints since the Middle Pleistocene on the northern Sanriku Coast, NE Japan

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  • 三陸海岸北部における遷急点を伴う河床縦断形の中期更新世以降の変化
  • サンリク カイガン ホクブ ニ オケル センキュウテン オ トモナウ カショウ ジュウダンケイ ノ チュウキ コウシン セイ イコウ ノ ヘンカ

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DEM-based longitudinal river profiles crossing paleo-sea cliffs on the northern Sanriku Coast re-present significant river knickpoints. Character-istics of the river profiles and landscapes of marine terraces imply a causal connection between knickpoint initiation and sea cliff formation. Based on a knickpoint migration model constructed from a stream power incision framework, the locations and ages of knickpoint initiation are estimated. Average knickpoint migration rate in the study area is approximated as 5m/ky.

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