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1998 Fiscal Year Final Research Report Summary

A study on changes in annual runoff ratio resulting from the global warming and their regional characteristics

Research Project

Project/Area Number 09680175
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 自然地理学
Research InstitutionMie University

Principal Investigator

MORI Kazuki  Mie University Faculty of Education, Professor, 教育学部, 教授 (60024494)

Project Period (FY) 1997 – 1998
Keywordsglobal warming / precipitation / evapotranspiration / discharge / runoff ratio / drainage basin / water balance / comparative hydrology
Research Abstract

In the present study, the temporal characteristics of long-term valiability in the annual precipitation, discharge and runoff ratio are discussed for the last 102 years, 1895 to 1996, as a case study under the humid temperate climate in central Japan. The purpose of this study is to elucidate the trends in frequency and severity of hydrological extremes with a research focus of their relationsto physical and socio-economic environment of the basin.
The results are summarized as follows :
1. Characteristics of long term valiability in water balance at meso-spatial scale were investigated by using instrumental records in the Kiso, Nagara, Ibi and Suzuka River Basins.
(1) Annual precipitation in the study basin is inclined to be below the average since the latter half of the 1980s, and its standard deviation has continued to increase since the 1960s.
(2) The notable characteristics on current frequency-magnitude distributions in annual precipitation are both the reduction of interval of drought events and the increase of range in each year.
2. The minimum value of annual precipitation since 1895 was recorded in 1994. Under the condition of this extreme hydrological events, the quality of river water showed the remarkable change as compared with the average value in normal year.
3. The trends identified provide a meaningful perspective on the valiability of precipitation, and are useful as basic information to evaluate the effect of climate change on hydrologicalenvironment.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] MORI, Kazuki: "Recent trend of annual precipitation and its effect on river water quality : A case study" Proc.Int.Symp.on Hydrology Water Resources and Environment Development and Management in Southeast Asia and the Pacific. 319-324 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] MORI, Kazuki: "Changes in the occurrence of drought over the last 100 years in drainage basins under the humid temperate climate (Abstract)" First Meeting of International Geographical Union Study Group on Environmental Change and Extreme Hydrological Events. (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 森 和紀: "地球温暖化が与える陸水環境の変化(講演要旨)" 日本陸水学会第63回大会講演要旨集. 25 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Mori, K.: "Recent trend of annual precipitation and its effect on river water quality : A case study" Proc.Int.Symp.on Hydrology Water Resources and Environment Development and Management in Southeast Asia and the Pacific. 319-324 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Mori, K.: "Changes in the occurrence of drought over the last 100 years in drainage basins under the humid temperate climate" First Meeting of International Geographical Union Study Group on Environmental Changes and Extreme Hydrologic Events. (Abstract). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Mori, K.: "Changes in the environment of inland waters as induced by global warming" Proc.63rd Annual Meeting Jap.Soc.Limnol.(Abstract ; in Japanese). 25 (1998)

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

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Published: 1999-12-08  

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