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A dynamical study of marine terrace formation

Research Project

Project/Area Number 61580210
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 自然地理学
Research InstitutionUniversity of Tsukuba

Principal Investigator

SUNAMURA Tsuguo  Institute of Geoscience, University of Tsukuba, 地球科学系, 教授 (00011164)

Co-Investigator(Kenkyū-buntansha) MATSUKURA Yukinori  Institute of Geoscience, University of Tsukuba, 地球科学系, 講師 (80107341)
Project Period (FY) 1986 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1987: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1986: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsMarine rock-terraces / abrasion terraces / shoreline angles / age of uplift / 段丘形成モデル / 海岸段丘 / 波のエネルギー / 岩石の力学的性質 / 海蝕台 / 模型実験
Research Abstract

(1) In order to examine what kind of landforms is created when waves are allowed to act on a gently sloping rock surface emerged as a result of uplift of the land, a laboratory test was performed using a model rocky coast with a uniform slope of 1/10. The model was made using a mixture of cement, sand, and water. The result showed that an abrasion terrace with a similar gradient to the original slope was formed in the surf zone and the shoreline angle was located slightly higher above Still Water Level.
(2) A mathematical model was constructed to describe the formation of Holocence marine rockterraces. The terrace width, W , is expressed by
Wi= [ Zi (B + Ri <tau>i + <lambda>i )/ h_b ] -R_<i+1> <tau>_<i+1> ( i = 1,2,・・・n) where Z is the amount of sea level fall, R is the recession rate of coastal cliffs, <tau> is the time for sea level stillstand, R<tau> is the recession distance of the cliffs, <lambda> is the horizontal distance from the intersecting point of sea level and the original landform profile to the initial coastline position, B is the width of abrasion terrace on the original landform, h_b is the maximum water depth for submarine abrasion, and the suffixes i-l, i, and i+l denote the sea levels i-l, i, and i+l, respectively.
(3) Seven coastal terraces well develop near Pukemuri Stream, Wairarapa, New Zealad, where the ages of three terraces (II, III, and IV ) out of seven are unknown. The above model was applied to this site to estimate the ages of these terraces. The result showed that the ages of II-, III-, and IV-terraces were estimated at 6,000, 5,300, and 4,300 y B.P., respectively.In this estimation, the age values for V-and VI-terraces were used for reference values. The estimated I-terrace age was 7,000 y B.P.which is colse to ^<14>C-value of I-terrace,about 6,700 y B.P. This suggests that model is reasonable.

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] Tsuguo Sunamura: Transactions,Japanese Geomorphological Union. 9. 17-33 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yukinori Matsukura: Transactions,Japanese Geomorphological Union.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Tsuguo Sunamura: Transactions,Japanese Geomorphological Union.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Tsuguo Sunamura: "Projection of future coastal cliff recession under sea level rise induced by the greenhouse effect: Nii-jima Island, Japan" Transactions, Japanese Geomorphological Union. 9. 17-33 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yukinori Matsukura: "Physical properties of rocks forming coastal terraces" Transactions, Japanese Geomorphological Union.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Tsuguo Sunamura: "A formative model for coastal rock-terraces" Transactions, Japanese Geomorphological Union.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Tsuguo Sunamura: Trans.Japan.Geomcphological Union.

    • Related Report
      1986 Annual Research Report
  • [Publications] Tsuguo Sunamura: Trans.Japan.Geomcphological Union.

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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