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Modeling for the prediction of beach changes considering sea level rise : a laboratory approach

Research Project

Project/Area Number 04452329
Research Category

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

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 Professor, 地球科学系, 教授 (00011164)

Project Period (FY) 1992 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥7,600,000 (Direct Cost: ¥7,600,000)
Fiscal Year 1994: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1993: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1992: ¥6,200,000 (Direct Cost: ¥6,200,000)
KeywordsSea level rise / Mode of sea level rise / Sandy beaches / Beach changes / Wave tank experiments / 海面上昇速度 / 砂浜海岸 / 二次元造波水路実験
Research Abstract

A wave tank experiment was conducted to examine the effect of the mode and rate of sea level rise on sandy beach morphologies using a wave tank. A model beach was constructed with an initial bottom slope of 1/10. Two kinds of well-sorted sand were selected for beach material : one was fine sand (0.22mm in diameter) and the other was coarse sand (0.69mm). Water depth was increased from 20 to 30 cm, according to two modes of water level rise : one was a discontinuous mode approximated by a step function and the other was a continuous mode with a linear function. The former had five different rising rates and the latter had two. Two kinds of laboratory waves were selected : erosional and accretionary waves ; the former had a wave period, T,of 0.8s and a deepwater wave height, Ho, of 6.5cm, and the latter T=2.2s and Ho=2.8cm.
In the discontinuous water level rise tests, changes in beach morphology near shoreline suffered no influence of water level rising rates when erosional waves acted on the beach of coarse sand, while more serious shoreline erosion occurred as rising rates became lower when erosional waves acted on the fine-sand beach. Shoreline accreted irrespective of rising rates and sediment grain sizes in the case of action of accretionary waves.
In the continuous water level rise tests, there was no considerable difference in final shoreline landforms irrespective of rising rates when erosional waves acted on the coarse-sand beach ; accretion arose under the condition of high rising rates, while erosion occurred under low rising rates when erosional waves acted on the fine-sand beach. In the case of the action of accretionary waves berm morphology occurred on the coarse sand beach when the rising rate was low, while no accretion took place when it was high ; and no typical accretionary morphology appeared on the fine-sand beach in regardless of rising rates.

Report

(4 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • 1992 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] 張達平、砂村継夫 他: "Laboratory experiment of longshore bars produced by breaker-induced vortex action" Proc.COASTAL DYNAMICS '94. 29-43 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 岡崎清市、砂村継夫: "Quantitative predictions for the position and height of beims" Geographical Review of Japan(Ser.B). 67. 100-116 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 砂村継夫、岡崎清市: "Breaker types and wave reflection coefficient" Journal of Coastal Research. 11(印刷中). (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 張達平、砂村継夫: "Multiple bar formation by breuher-induced vortices:A Laboratory approachud" Proc,24th International Cenfereuce a Coastal Engineering. (印刷中). (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 砂村継夫: "Effects of the mode and rate of sea level rise on sandy beach morphologies" Transactions,Japanese Geomorphological Union. (予定).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 張達平・砂村継夫: "Laboratory study of the change in breaher types due to the pressure of an artificial bar" Ann.Rept.,Institute of Geoscience University of Tsukuba. 19. 23-25 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] D.P.Zhang and T.Sunamura: "Laboratory study of the change in breaker types due to the presence of an artificial bar." Ann, Rept., Inst, Geosci., Univ.Tsukuba. No.19. 23-25 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] D.P.Zhang and T.Sunamura S.Tanaka and K.Yamamoto: "Laboratory experiment of longshore bars produced by breaker-induced vortex action." Coastal Dynamics '94, ASCE,Barcelona, Spain. 29-43 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] S.Okazaki and T.Sunamura: "Quantitative prediction for the position and height of berms." Geog.Rev.Japan. Vol.67 (B). 100-116 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] D.P.Zhang and T.Sunamura: "Multiple bar formation by breaker-induced vortices : a laboratory approach." Proc.24th Int.Conf.Coastal Eng., ASCE,Kobe, Japan. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Sunamura and S.Okazaki: "Breaker types and wave reflection coefficient : laboratory relationships." Jour.Coastal Res.Vol.11 (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Sunamura: "Effects of the mode and rate of sea level rise on sandy beach morphologies." Trans.Japan.Geomorph.Union. (in preparation).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 張達平・砂村継夫 他: "Laboratory experiment of longshone bars produced by breaker induced vortex action" Proc.COASTAL DYNAMICS'94. 29-43 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 岡崎清市.砂村継夫: "Quantitatine Predictions for the Position and height of berms" Geogroghical Revieu of Japan(Ser.B). 67. 100-116 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 砂村継夫・岡崎清市: "Breaher types and wave reflection coefficient" Journal of Coastal Research. 11(印刷中). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 張達平・砂村継夫: "Multiple bar formation by bneaher-induced vortices:A laboratory approach" Proc.24th International Conference on Coastal Engineoring. (印刷中). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 砂村継夫: "Effects of the modl and rate of sea lewl rice on sanly beach morphologies" Transactions,Japanese Geomorphilogical Union. (予定).

    • Related Report
      1994 Annual Research Report
  • [Publications] 砂村継夫: "海面上昇と砂浜海岸の地形変化" 海岸工学論文集. (発表予定).

    • Related Report
      1993 Annual Research Report
  • [Publications] 砂村 継夫: "海面上昇に伴う砂浜海岸の地形変化に関する一実験" 地形.

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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