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Estimation of groundwater exfiltration with environmental tracers in extensive irrigated paddy areas and reducing model uncertainties

Research Project

Project/Area Number 16K18774
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Rural environmental engineering/Planning
Research InstitutionNational Agriculture and Food Research Organization

Principal Investigator

Yoshida Takeo  国立研究開発法人農業・食品産業技術総合研究機構, 農村工学研究部門, 主任研究員 (80414449)

Project Period (FY) 2016-04-01 – 2018-03-31
Project Status Completed (Fiscal Year 2017)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords流域水循環 / 水田灌漑 / 環境同位体 / 地表水・地下水交流 / Sr同位体比 / 水文モデル / 農業工学
Outline of Final Research Achievements

Water flows in watersheds containing extensive areas of irrigated paddies are complex because of the substantial volumes involved, and the repeated cycles of water diversion from, and return to, streams. Numerous studies have attempted to quantify the surface water-groundwater interactions using the stable isotopes of water; however, the temporal variation in these isotopic compositions due to fractionation during evaporation from water surfaces hinders their application to watersheds with extensive irrigated paddies. Our study shows how surface water-groundwater interactions can change 87Sr/86Sr along river reaches; and the continuous decline in the 87Sr/86Sr along the stream suggests an discharge of water from the shallow aquifers. The water samples in the Gogyo River during the non-irrigated period were lower in 87Sr/86Sr and higher in Sr concentrations, suggesting an increase in relative contributions of the water from the shallow aquifers during the non-irrigated period.

Report

(3 results)
  • 2017 Annual Research Report   Final Research Report ( PDF )
  • 2016 Research-status Report
  • Research Products

    (5 results)

All 2018 2017

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

  • [Journal Article] 87Sr/86Srトレーサーを利用した 水田灌漑流域における地表水・地下水交流の定量化2018

    • Author(s)
      吉田武郎,中野孝教,申基澈, 土原健雄,宮津進,皆川裕樹,久保田富次郎
    • Journal Title

      応用水文

      Volume: 30 Pages: 55-64

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Presentation] 水田灌漑流域の地表・地下水の交流現象解明に向けた87Sr/86Srトレーサーの利用可能性2017

    • Author(s)
      吉田武郎、申基澈、土原健雄、宮津進、皆川裕樹、久保田富次郎
    • Organizer
      日本地球惑星科学連合2017年大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Applicability of 87Sr/86Sr in examining return flow of irrigation water in highly agricultural watersheds2017

    • Author(s)
      吉田武郎、中野孝教、申基澈、土原健雄、宮津進、皆川裕樹、久保田富次郎
    • Organizer
      American Geophysical Union Fall Meeting
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 水田灌漑流域の地表・地下水の交流現象解明に向けた87Sr/86Srトレーサーの利用可能性2017

    • Author(s)
      吉田武郎、中野孝教、申基澈、土原健雄、宮津進、皆川裕樹、久保田富次郎
    • Organizer
      農業農村工学会大会講演会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 87Sr/86Srトレーサーによる水田灌漑流域の地表水・地下水の交流現象の定量化2017

    • Author(s)
      吉田武郎、中野孝教、申基澈、土原健雄、宮津進、皆川裕樹、久保田富次郎
    • Organizer
      水文・水資源学会 2017 年度総会・研究発表会
    • Related Report
      2017 Annual Research Report

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Published: 2016-04-21   Modified: 2019-03-29  

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