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Response of river networks in reach and basin scales to climate change and tectonics: physical model experiments and field study

Research Project

Project/Area Number 16K01216
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Geography
Research InstitutionKanazawa University

Principal Investigator

Endo Noritaka  金沢大学, 地球社会基盤学系, 准教授 (60314358)

Co-Investigator(Kenkyū-buntansha) 水上 知行  金沢大学, 地球社会基盤学系, 助教 (80396811)
松四 雄騎  京都大学, 防災研究所, 准教授 (90596438)
Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords河川地形 / 岩盤河川 / 山岳河川 / モデル実験 / アナログ実験 / 傾動隆起 / 河成段丘 / 岩盤強度 / 河床縦断形 / 遷急点 / 河川モデル実験 / 山地河川 / 岩盤河床 / 下刻速度 / 下方侵食 / 穿入蛇行 / 地表プロセス / テクトニクス
Outline of Final Research Achievements

Geomorphological characteristics of mountainous river basins are results from the response of rivers to orogenic activities, i.e. tectonics. Uplift rate, however, is generally neither uniform nor constant. It is not easy to reconstruct the history of tectonics from river basin topotgarphies. We found, through laboratory model experiments, that a longitudinal profile of river tends to have a convex shape at the middle reach, if the uplift rate increases spatially from upstream to downstream. This explains the difference of river longitudinal profiles of the east and west basins in Yakushima. We also performed model experiments targeting the reach-scale transition of channels, and observed that lateral migration of channels was suppressed during uplift activities. Additionally, we conducted field research of the Tedori river,and found correlation between the channel shape and hardness of bedrocks, if the hardness is evaluated using coefficient of restitution.

Academic Significance and Societal Importance of the Research Achievements

山岳地形の特徴はそこを流れる河川によって形成される。しかし、河川は専ら侵食するだけであるから、河川侵食だけが地表で起きるならば、長い年月ののち山自体がなくなってしまう。そうならないのは、地殻変動によって山が絶えず隆起しているからである。川の侵食速度は雨量などに依存するため気候変動の影響を受けて変動する。一方、隆起の方も長いタイムスケールで見れば地殻変動も一定でないため変化する。気候変動は土砂災害と、地殻変動は地震の発生と関連していて、過去の変遷や各地域の特性を解明できれば防災にも貢献する。本研究は現存する地形から過去及び未来の変動を推定するモデルに必要な基礎データを提供する。

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (11 results)

All 2019 2018 2017

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (9 results) (of which Int'l Joint Research: 5 results)

  • [Journal Article] Paleolake reconstruction and estimation of paleo-inflow in the Olgoi Basin, Mongolia, based on GIS and hydraulic analyses2019

    • Author(s)
      Noritaka Endo, Yusuke Matsumura, Noriko Hasebe, Davaadorj Davaasuren
    • Journal Title

      Island Arc

      Volume: 28 Issue: 3

    • DOI

      10.1111/iar.12299

    • Related Report
      2019 Annual Research Report 2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Adjustment processes of mountainous rivers affected by tilting uplift: Laboratory experiments and a case study of Yakushima Island, Japan2018

    • Author(s)
      Genno Reiko、Endo Noritaka
    • Journal Title

      Island Arc

      Volume: 28 Issue: 1

    • DOI

      10.1111/iar.12278

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] 河川地形の地殻変動への応答に関するモデル実験2019

    • Author(s)
      遠藤徳孝
    • Organizer
      日本物理学会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Stream power incision model and the stage of topographic equilibrium, using physical experiments.2019

    • Author(s)
      Imamura, A. and Endo, N.
    • Organizer
      日本地球惑星科学連合
    • Related Report
      2019 Annual Research Report
  • [Presentation] Rock restrictions on topographical features of rivers: Model experiment.2019

    • Author(s)
      Takase, Y. and Endo, N.
    • Organizer
      日本地球惑星科学連合
    • Related Report
      2019 Annual Research Report
  • [Presentation] Incision rate, riverbed slope and contributing area of an experimental drainage basin2018

    • Author(s)
      Imamura, A. and Endo, N.
    • Organizer
      Japan Geoscience Union Meeting 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Paleohydrology of Olgoi Basin, headwater of Valley of the Gobi lakes, Mongolia2017

    • Author(s)
      Matsumura Y., Endo N., Hasebe N., Davaasuren D.
    • Organizer
      14th International Workshop Present Earth Surface Processes and Long-term Environmental Changes in East Eurasia (@ Novosibirsk, Russia)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Relationship between bedrock strength and change in shape of bedrock channel due to base level lowing: Laboratory experiments2017

    • Author(s)
      Sota Iijima, Noritaka Endo
    • Organizer
      Japan Geoscience Union Meeting 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Temporal change of incision rate in relation with development of river terraces: model experiment2017

    • Author(s)
      Miki Yamamura, Noritaka Endo
    • Organizer
      日本地球惑星科学連合2017年大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Laboratory experiment of river terraces formation under tilting uplift2017

    • Author(s)
      Miki Yamamura, Noritaka Endo
    • Organizer
      Japan Geoscience Union Meeting 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Consideration of paleolake and paleo-inflow in Olgoi basin, upstream of Valley of the Gobi Lakes, Mongolia2017

    • Author(s)
      Yusuke Matsumura, Noritaka Endo, Noriko Hasebe, Davaasuren Davaadorj
    • Organizer
      Japan Geoscience Union Meeting 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research

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Published: 2016-04-21   Modified: 2021-02-19  

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