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Mechanism of nutrient dynamics and water quality formation driven by subsurface water flow of sand bar in sandy river

Research Project

Project/Area Number 17K14729
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Hydraulic engineering
Research InstitutionNagoya University

Principal Investigator

OBANA Makiko  名古屋大学, 工学研究科, 講師 (10447831)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords砂州 / 伏流水 / 窒素動態 / 脱窒能 / 河道植生域 / 河川砂州 / 水質 / 河川植生 / 地形変化 / 伏流水質 / 伏流水流動
Outline of Final Research Achievements

The conservation and adjustment of sandbar landscape is pointed out as the goal of river environmental management. This study is focused on the denitrification of sand bar driven by subsurface water flow in aim to the quantification of water purification function in a river. This research is consisted of 3 parts as 1) monitoring of subsurface water flow and water quality in sandbars, 2) mechanism analysis of nutrient dynamic based on water flume experiment, and 3) development of nutrient dynamics model. In the result, the new method for quantify the denitrification potential based on the field observation result which include morphological and hydronic parameters was proposed. An empirical formula which quantifies the potential according to landscape elements in sand bar was created by using the field data. Furthermore, it has become possible to compare the denitrification potential of each river by using our new method.

Academic Significance and Societal Importance of the Research Achievements

本研究によって,今まで個別事象として捉えられてきた①表流水流れ・土砂輸送と伏流水流動,および②砂州内窒素循環過程の統合的な取り扱いが可能となり,砂州の伏流水を通した窒素循環過程の代表プロセスである脱窒についての基礎的な現象が明らかとなったことに大きな意義がある.その現象の把握とモデリングにより植生種や比高などが考慮された場所に応じた砂州の栄養状態が把握されることは,河道の植生成長や生物生息場などの知見に,学術的基礎を提供するものとして位置づけられるほか,洪水時の流れ・土砂輸送と関連づけられていることから,河川がインパクトを受けた際の窒素動態の予測の議論に繋がるものでもある.

Report

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

    (7 results)

All 2019 2018 2017

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 3 results) Presentation (4 results)

  • [Journal Article] 高水敷高さおよび植生の有無が高水敷への浮遊砂堆積に与える影響2019

    • Author(s)
      尾花まき子,村上尚哉,戸田祐嗣
    • Journal Title

      土木学会論文集B1(水工学)

      Volume: Vol.75

    • NAID

      130007940136

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 植生流出が河岸侵食に与える影響に関する実験的研究2018

    • Author(s)
      尾花まき子,中村俊之,戸田祐嗣,椿涼太
    • Journal Title

      土木学会論文集B1(水工学)

      Volume: 74 Pages: 1267-1272

    • NAID

      130007757753

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Flow and Sediment Transport with Non-Submerged Riparian Vegetation in 1D Scheme2017

    • Author(s)
      27.Ho-Seong JEON, Makiko OBANA, Kyu-Ho KIM, Tetsuro TSUJIMOTO
    • Journal Title

      Journal of Coastal Research

      Volume: 79 Pages: 329-333

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Experimental study on bank erosion with vegetation destruction2019

    • Author(s)
      Toshiyuki Nakamura, Makiko Obana, Yuji Toda, Ryota Tsubaki
    • Organizer
      Ecology and Civil Engineering -Japan-South Korea Joint Seminar
    • Related Report
      2019 Annual Research Report
  • [Presentation] 植生流出を考慮した河岸侵食の進行過程に関する水理実験2019

    • Author(s)
      中村俊之,尾花まき子,戸田祐嗣,椿涼太
    • Organizer
      応用生態工学会第23回研究発表会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 河道内砂州における粒状有機物の分解過程2019

    • Author(s)
      尾花まき子,大橋雅樹,辻本哲郎
    • Organizer
      応用生態工学会第23回研究発表会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 植生を有する河道の側岸侵食機構に関する水理実験―礫床河道の植生化した中州掘削水路を例として―2017

    • Author(s)
      尾花まき子
    • Organizer
      土木学会第72回年次学術講演会
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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