• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2004 Fiscal Year Final Research Report Summary

Human impact on fluvial environment during the reclamation period in Tokachi Plain, Hokkaido, JAPAN.

Research Project

Project/Area Number 14580099
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 自然地理学
Research InstitutionJoetsu University of Education

Principal Investigator

YAMAGATA Kotaro  Joetsu University of Education, Associate Professor, 学校教育学部, 助教授 (80239855)

Co-Investigator(Kenkyū-buntansha) HIRAKAWA Kazuomi  Hokkaido University, Graduate School of Environmental Science, Professor, 大学院・地球環境科学研究科, 教授 (40126652)
KURASHIGE Yoshimasa  The University of Shiga Prefecture, School of Environmental Science, Associate Professor, 環境科学部, 助教授 (20241383)
HASEGAWA Hiroshi  The University of Shiga Prefecture, School of Environmental Science, Professor, 環境科学部, 教授 (00090457)
Project Period (FY) 2002 – 2004
KeywordsTokachi plasin / Human impact / wetland deposits / lake deposit / suspended deposit / environmental radionuclide / reed / gene
Research Abstract

Hokkaido is a region where the main factor of production changed drastically from hunting and gathering society of Ainu to farming society of Wajin on the boundary of Meiji Restoration. Therefore, the region is an extremely important region for examining the influence of human impact to natural environment. It can be thought that the deposit of the flood plain and lakes and marshes in the downstream recorded past environmental changes occurred in the drainage area, such as large-scale deforestation and reclamation. The aim of this research is to clarify the situation of the artificial environmental destruction and its influence to the fluvial environment during the development period in Tokachi Plain.
By means of detailed analysis of the floodplain and lake deposits and observation of soil profiles in the drainage basins, it was confirmed that the coarsening of the deposits and increasing of depositional speed occurred in response to the human activity in the most of river basins of sou … More thern Tokachi Plain. By the chronological investigation using 137Cs and tephra, it was confirmed that rapid sand deposition occurred in response to the postwar abrupt farmland expansion in the Toberi river basin. And we also found the evidence of frequent forest fires during early Meiji era. The main source of the coarse materials was identified as a tributary (Toberi Horonai River) by grain-size sediment-tracer technique and mineralological investigation. Furthermore, such active sediment supply from the river induced the transportation of reed rhizomes from the upper course to the wetland to form new population. The lake sediment core was taken from the lagoon (Yudou-Pond) and analyzed. As a result, it was clarified that the coarsening of the deposit began in around 1920, and depositional speed had accelerated further in 1960's. By the observation of soil profiles in the Yudou river basin, it was suggested that the reclamation of pastures is the most important cause of the soil erosions. Less

  • Research Products

    (7 results)

All 2005 2004 2003

All Journal Article (7 results)

  • [Journal Article] Sandy sediment supply due to intensive cultivation during the 20th century in the Toberi River basin, Hokkaido, Japan.2005

    • Author(s)
      Kurashige, Y., Ikejiri, K., Suzuki, S., Hirakawa, K.
    • Journal Title

      Transactions Japanese Geomorphological Union 26

      Pages: 131-149

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Landform processes have great impacts on the establishment and distribution of common reed (Phragmites australis) populations.2005

    • Author(s)
      Nomiyama, T., Kurashige, Y., Morikawa T., Hasegawa H.
    • Journal Title

      Transactions, Japanese Geomorphological Union 26

      Pages: 225-238

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Sandy sediment supply due to intensive cultivation during the 20th century in the Toberi River basin, Hokkaido, Japan.2005

    • Author(s)
      Kurashige, Y., Ikejiri, K., Suzuki, S., Hirakawa, K.
    • Journal Title

      Transactions Japanese Geomorphological Union 26-2

      Pages: 131-149

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Landform processes have great impacts on the establishment and distribution of common reed (Phragmites australis) populations.2005

    • Author(s)
      Nomiyama, T., Kurashige, Y., Morikawa, T., Hasegawa, H.
    • Journal Title

      Transactions, Japanese Geomorphological Union 26-3

      Pages: 225-238

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] 石狩低地帯南部,テフラ-土壌累積層に記録された最終間氷期以降の植物珪酸体群の変遷 -特にササ類の地史的動態に注目して-2004

    • Author(s)
      佐瀬隆, 山縣耕太郎, 細野衛, 木村準
    • Journal Title

      第四紀研究 43-6

      Pages: 1-12

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Phytolith records from tephra-soil sequence since the Last Interglacial in the southern Ishikari Lowland, Hokkaido, Japan : With special reference to fluctuation of the Sasa group (Dwarf Bamboo) in paleo-vegetation.2004

    • Author(s)
      Sase, T., Yamagata, K., Hosono, M., Kimura, J.
    • Journal Title

      Quaternary Research 43-6

      Pages: 1-12

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Comparison between shear stress calcurated from hydrological data and critical shear stress estimated from stratigraphy and grain-size distribution of river-bed and river-terrace deposit.2003

    • Author(s)
      Kurashige Y., Hirakawa K., Yamagata K.
    • Journal Title

      Transactions Japanese Geomorphological Union 24-2

      Pages: 183-203

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

URL: 

Published: 2007-12-13  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi