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2004 Fiscal Year Final Research Report Summary

FLOW AND WATER QUALITY OF UNCONFINED GROUNDWATER IN TAKAMATSU PLAIN

Research Project

Project/Area Number 15560444
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 水工水理学
Research InstitutionHIROSHIMA UNIVERSITY (2004)
Kagawa University (2003)

Principal Investigator

KAWAHARA Yoshihisa  HIROSHIMA UNIVERSITY, GRADUATE SCHOOL OF ENGINEERING, PROFESSOR, 大学院・工学研究科, 教授 (70143823)

Co-Investigator(Kenkyū-buntansha) HASEGAWA Shuichi  KAGAWA UNIVERSITY, FACULTY OF ENGINEERING, PROFESSOR, 工学部, 教授 (00325317)
Project Period (FY) 2003 – 2004
Keywordsunconfined groundwater / groundwater level / groundwater quality / groundwater contamination / nitrate nitrogen / nitrogen isotope ratio / ammonia volatilization / organic / inorganic fertilizer
Research Abstract

The present study aimed to understand the distribution of flow and quality of unconfined groundwater in Takamatsu plain and to detect the source of nitrate nitrogen in groundwater in the left bank area of Koto River, where high nitrate concentration has been measured all the year round. Major results in this study are summarized as follows.
1.Measurement of unconfined groundwater quality at 65 stations and the cluster analysis of the Stiff diagrams demonstrated that the groundwater quality can be classified into four categories, one of which shows anthropogenic effects.
2.Intensive field measurement in the target area that locates on the alluvial fan of Koto River, the information on the land use and the fertilizers used along with the analysis of major anions and cations attributed the nitrate contamination in the area to the fertilizers.
3.The nitrogen isotope ratio at several locations showed higher value than that reported in the past studies. The isotope-ratio analysis taking account of the effect of ammonia volatilization was then applied to indicate that both organic and inorganic fertilizers are responsible for the high concentration of nitrate nitrogen, which agreed well with the information of the fertilizers.
4.Two dimensional numerical simulation of confined groundwater, which accounts for the interaction between confined and unconfined groundwater, showed that the confined aquifer receives a lot of unconfined groundwater in the target area and hence that the improvement of fertilization is necessary to prevent nitrate contamination in the confined groundwater.

  • Research Products

    (12 results)

All 2005 2004

All Journal Article (12 results)

  • [Journal Article] 高松平野における被圧地下水の水位上昇の機構2005

    • Author(s)
      河原能久
    • Journal Title

      土木学会水工学論文集 49

      Pages: 85-90

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Mechanism of increase in confined groundwater levels in Takamatsu plain2005

    • Author(s)
      Kawahara, Y.
    • Journal Title

      Annual J.Hydraulic Engineering (JSCE) Vol.49

      Pages: 85-90

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] 香東川左岸地域における硝酸性窒素による地下水汚染2004

    • Author(s)
      橋本美智子
    • Journal Title

      地下水地盤環境に関するシンポジウム2004 -地下水の涵養と流動保全-

      Pages: 85-90

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 高松平野における被圧地下水位の上昇の原因2004

    • Author(s)
      河原能久
    • Journal Title

      水文・水資源学会2004年研究発表会要旨集

      Pages: 88-89

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 高松平野の不圧地下水の水質形成機構に関する考察2004

    • Author(s)
      橋本美智子
    • Journal Title

      水文・水資源学会2004年研究発表会要旨集

      Pages: 96-97

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 高松市における水道管の腐食および地下水質の調査・分析2004

    • Author(s)
      高橋一将
    • Journal Title

      平成16年度四国支部技術研究発表会講演概要集

      Pages: 406-407

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 香川県における地盤情報データベースの構築と高松平野の地盤構造2004

    • Author(s)
      長谷川修一
    • Journal Title

      土木学会四国支部「四国の自然災害と防災」 43

      Pages: 49-78

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Nitrate contamination of unconfined groundwater in the left bank area of Koto river2004

    • Author(s)
      Hashimoto, M.
    • Journal Title

      Proc.of Symp.on Ground and Groundwater Environment 2004, -Increment and Conservation of groundwater-

      Pages: 85-90

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] The cause of the rise of confined groundwater levels in Takamatsu plain2004

    • Author(s)
      Kawahara, Y.
    • Journal Title

      Proc.Annual Conference of JSHW

      Pages: 88-89

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Measurement and analysis of unconfined groundwater quality in Takamatsu plain2004

    • Author(s)
      Hashimoto, M.
    • Journal Title

      Proc.Annual Conference of JSHW

      Pages: 96-97

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Corrosion of underground water pipes and the adjacent groundwater quality in Takamatsu area2004

    • Author(s)
      Takahashi, K.
    • Journal Title

      Proc.Annual Meeting of Shikoku Branch (JSCE)

      Pages: 406-407

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Development of geoinformation database for Kagawa Prefecture and its application to the geological structure of Takamatsu plain2004

    • Author(s)
      Hasegawa, S.
    • Journal Title

      Proc.of Natural Disasters and Prevention in Shikoku, Shikoku Branch (JSCE) Vol.43

      Pages: 49-78

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2006-07-11  

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