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Formation of sedimentary structures in flume experiments under upper-flow-regime conditions

Research Project

Project/Area Number 08640565
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Geology
Research InstitutionDepartment of Geoiogy, Faculty of Education, Iwate University.

Principal Investigator

YAGISHITA Koji  Iwate University, Department of Geology, Faculty of Education Professor, 教育学部, 教授 (90239731)

Co-Investigator(Kenkyū-buntansha) ASHI Jyuichiro  University of Tokyo, Graduate School, Institute of Geoscience Assistant Professo, 大学院・理学研究科, 助手 (40251409)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1997: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1996: ¥1,100,000 (Direct Cost: ¥1,100,000)
Keywordsplane beds / flume experiments / upper-flow-regime / imbrication / detrital grains / Froude Number / ripples / low-relief bedform / formational process / critical flow. / 掃流力 / 無次元掃流力 / 粒子配列 / 堆積構造 / リップル
Research Abstract

In an attempt to produce plane beds under upper-flow-regime conditions, we have conducted a number of runs (experiments) using a hydraulic flume of 15 cm wide and 700 cm long, at the Ocean Research Institute, University of Tokyo. We have succeeeded in producing two types of plane beds : 1) laminae formed and buried by the migration of low-relief asymmetric ripples under near- or sub-critical flow (Froude Number Fr=0.94 ; type 1), and 2) laminae formed without causing any low-relief bedform but under super-critical flow (Fr=1.98 ; type 2). After making these two types of plane beds, imbrication of detrital grains along each plane bed was investigated. The sediments of sand-sized quartz grains (mean diameter 0.72 mm) show a high angle of imbrication (up to 30゚) in type 2, whereas very low angle of imbrication (close to 0゚) in type 1. Differences of imbrication angle between the two types of plane bed may be useful to infer the individual formational process of plane beds that are observed in the field.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] 八木下 晃司・芦 寿一郎・二宮 懐・平 朝彦: "水槽実験による高い流れ領域での平坦ラミナの形成について-予報-" 地学雑誌. 106巻・第3号. 356-363 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] YAGISHITA,K., ASHI,J., NINOMIYA,S.& TAIRA,A.: "A preliminary report on experimental plane beds under upper-flow-regime conditions" Journal of Geography. v.106. 356-363 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] YAGISHITA,K., ASHI,J., NINOMIYA,S.& TAIRA,A.: "Plane beds in flumes under upper-flow-regime conditions." Annual Meeting of Sedimentological Society of Japan (at Shizuoka Univ.) Abstract. 79-80 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 八木下晃司・芦寿一郎・二宮悟・平朝彦: "水槽実験による高い流れ領域での平坦ラミナの形成について-予報-" 地学雑誌. 106巻・第3号. 356-363 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 八木下晃司・芦寿一郎・二宮悟・平朝彦: "水槽実験による高い流れ領域での平坦ラミナの形成について-予報-" 地学雑誌. 106巻3号. (1997)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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