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Preliminary Study to Reconstruct the History of Water Quality Change of Recent Past

Research Project

Project/Area Number 24650605
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Geography
Research InstitutionThe University of Shiga Prefecture

Principal Investigator

KURASHIGE Yoshimasa  滋賀県立大学, 環境科学部, 教授 (20241383)

Co-Investigator(Kenkyū-buntansha) MARUO Masahiro  滋賀県立大学, 環境科学部, 准教授 (80275156)
Project Period (FY) 2012-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2012: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords河川堆積物 / 柱状試料 / 年層 / 環境復元 / 湛水域 / 近過去 / 水質復元 / 堆積物柱状試料 / 堆積物 / 堆積年代 / 古環境復元 / 水質
Outline of Final Research Achievements

The river mouth of Kitagawa Brook is normally stagnant because it is easily closed by sand and gravel transported by littoral currents of Biwa Lake, Japan. A new urban area exists in the basin and sewerage works were constructed in the early 1990s, so contaminated water with a bad odour had flowed into the brook before the sewerage works. To reduce the smell, the river mouth was excavated to narrow the channel in the early 1980s. Thus, river-bed sediment after this excavation only occurs at the river mouth. From the upper 24 cm of a sediment core, we found 19 strata of leaves which were supplied from deciduous trees in autumn. We also found several gravel layers which were supplied from the lake during severe storms. The combination of veins and gravel layers were reconstructed for about 20 years of sediment records with an error of two to three years.

Report

(4 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Research-status Report
  • 2012 Research-status Report
  • Research Products

    (5 results)

All 2014

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Acknowledgement Compliant: 1 results) Presentation (4 results)

  • [Journal Article] Annual layers in river-bed seidment of a stagnant river-mouth area of the Kitagawa Brook, Central Japan2014

    • Author(s)
      Yoshimasa Kurashige, Toshiaki Nakano, Eri Kasubuchi, Masahiro Maruo and Hanako Domitsu
    • Journal Title

      IAHS Publication

      Volume: 367 Pages: 251-257

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] Annual layers in river-bed sediment of a stagnant river-mouth area of the Kitagawa Brook, Central Japan2014

    • Author(s)
      Yoshimasa Kurashige, Toshiaki Nakano, Eri Kasubuchi, Masahiro Maruo and Hanako Domitsu
    • Organizer
      ICCE2014
    • Place of Presentation
      New Orleans, USA
    • Year and Date
      2014-12-11 – 2014-12-14
    • Related Report
      2014 Annual Research Report
  • [Presentation] 彦根市北川河口域堆積物を用いた近過去復元の試み2014

    • Author(s)
      倉茂好匡、中野利昭、丸尾雅啓、堂満華子
    • Organizer
      日本地形学連合2014年秋季大会
    • Place of Presentation
      奈良県奈良市 奈良大学
    • Year and Date
      2014-10-11 – 2014-10-12
    • Related Report
      2014 Annual Research Report
  • [Presentation] 彦根市北川河口域の堆積物柱状試料を用いた過去30年の環境復元の試み2014

    • Author(s)
      倉茂好匡、中野利昭
    • Organizer
      日本地理学会2014年春季大会
    • Place of Presentation
      国士舘大学
    • Related Report
      2013 Research-status Report
  • [Presentation] 琵琶湖に流入する河川の河口堆積物の化学分析による近過去環境の復元2014

    • Author(s)
      丸尾雅啓、倉茂好匡、後藤達
    • Organizer
      日本陸水学会近畿支部会第25回研究発表会
    • Place of Presentation
      摂南大学寝屋川キャンパス
    • Related Report
      2013 Research-status Report

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Published: 2013-05-31   Modified: 2019-07-29  

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