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Height of coastal sand banks and sea level change at Japanese beaches

Research Project

Project/Area Number 14580102
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

TAKEDA Ichirou  Kyoto University of Education, Department of Education, Professor, 教育学部, 教授 (30197298)

Co-Investigator(Kenkyū-buntansha) 砂村 継夫  大阪大学, 大学院・理学研究科, 教授 (00011164)
Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2004: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 2003: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2002: ¥700,000 (Direct Cost: ¥700,000)
KeywordsJapanese beaches / backshore / wave runup height / nearshore bars / coastal banks / sand bars / sand spits / sea level change / 駿河湾 / 巨礫 / 戸田砂嘴 / 大瀬崎 / 明神池 / 砂礫堤 / 海岸砂礫州 / 海水準変動 / 後氷期海進 / 後浜上限高度
Research Abstract

Bay-mouth barrier, sand spit, and sand and gravel bars, which is extending parallel to the coastline along the seaward end of coastal lowlands, are called "coastal banks" in this report. Generally, it is considered that the top part of coastal banks is formed during the marine transgression term. Using data obtained from Japanese beaches, this report purpose to discuss the relationship between the formation of coastal banks and sea level change of the Japanese coast in connection with the relative height (h) between the top of coastal banks and the landward limit of the backshore which corresponds to the present sea level.
It becomes clear that the height of the landward limit of the backshore(BH) is closely related to the grain size of beach material (D) and the number of nearshore submarine bars (N) on the exposed beaches, and that BH is almost constant independent of D and N on the beaches facing the Inland Sea of Japan. It was also proved that there is no correlation between BH and D on the pocket beaches, and that BH decreases abruptly with increasing N, and tends to approach the steady value of 2 m.
Based on the result about BH mentioned above, some coastal banks along the Japanese coast were examined about h. Investigation shows that there were four types of coastal banks, i.e., (1)h decreases to the direction of longshore sediment transport, (2)his nearly same at any point along the shoreline, (3)his about 0 (zero) at every point, and (4)h changes in the direction of the shoreline disorderly.
It can be considered that type (1)is formed during the regression term of the sea level, type (2)is formed within the short period of time during which the change of the sea level can disregard, type (3)is formed after the sea level settled in the present level, and type (4)is covered with coastal sand dunes.

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (8 results)

All 2003 Other

All Journal Article (4 results) Publications (4 results)

  • [Journal Article] バーの段数と後浜上限高度との関係2003

    • Author(s)
      武田一郎
    • Journal Title

      地形 24巻4号

      Pages: 407-417

    • NAID

      110001269633

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Stability and height of the landward limit of the backshore at Japanese beaches2003

    • Author(s)
      Ichirou Takeda
    • Journal Title

      Journal of Coastal Research Vol.19,No.4

      Pages: 1082-1093

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] The relationship between the height of the landward limit of the backshore and the number of nearshore bars.2003

    • Author(s)
      Ichirou Takeda
    • Journal Title

      Transactions of the Japanese of Geomorphological Union(In Japanese) Vol.24, No.4

      Pages: 407-417

    • NAID

      110001269633

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Stability and height of the Landward limit of the backshore at Japanese beaches.2003

    • Author(s)
      Ichirou Takeda
    • Journal Title

      Journal of Coastal Research Vol.19, No.4

      Pages: 1082-1093

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] Takeda, I.: "Stability and height of the landward limit of the backshore at Japanese beaches"Journal of Coastal Research. Vol.19,No.4. 1082-1093 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 武田一郎: "バーの段数と後浜上限高度との関係"地形. 第24巻第4号. 407-417 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Takeda, I.: "Stability and height of the landward limit of the backshore at Japanese beaches"Journal of Coastal Research. (Submitted). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Sunamura, T.: "A predictive relationship for the spacing of beach cusps"Coastal Engineering. (Submitted). (2003)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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