New bedform phase diagram for combined flow, aiming for the accurate interpretation of sedimentary structures.

2010 Fiscal Year Final Research Report

• Project/Area Number: 20340141
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Geology
• Research Institution: Osaka Institute of Technology
• Principal Investigator: YOKOKAWA Miwa Osaka Institute of Technology, 情報科学部, 准教授 (30240188)
• Co-Investigator(Kenkyū-buntansha): SEKIGUCHI Tomohiro 筑波大学, 生命環境科学研究科, 講師 (90400647) ; TAKAGAWA Tomohiro 東京大学, 工学(系)研究科(研究院), 助教 (30451785)
• Research Collaborator: GARCIA Marcelo H. イリノイ大学, 工学部, 教授 ; PARKER Gary イリノイ大学, 工学部, 教授 ; BEST Jim イリノイ大学, 理学部, 教授 ; PERILLO Mauricio M. イリノイ大学, 理学部, 院生
• Project Period (FY): 2008 – 2010
• Keywords: 複合流 / ベッドフォーム / 堆積構造 / 水路実験 / PIV / 渦度

Research Abstract

We newly performed a series of flume-experiments to investigate the relationship between hydraulic conditions and bedform morphology and internal sedimentary structures generated by combined flow, i.e., combined waves and currents, with 4-sec and 6-sec oscillation periods. The results were compiled with previous experimental results, and we found that there is dependence on oscillation periods and grain size in changing morphology of bedforms. In addition, PIV analyses were conducted to investigate the characteristic water movement and distribution of the vorticity around the combined-flow ripples.

Research Products

• [Journal Article] Topography of ripples generated by combined waves and currents and surrounding water movement analyzed by PIV. (2009)
  • Author(s): Yokokawa M., Ohki K., Sekiguchi T., Takagawa T.
  • Journal Title: River, Coastal and Estuarine Morphodynamics (RCEM 2009)(Vionnet C., et al., eds.) Pages: 799-804
  • Peer Reviewed
• [Journal Article] Experimental study on formative conditions of hummocky bedforms (2009)
  • Author(s): Takagawa T., Masuda F.
  • Journal Title: River, Coastal and Estuarine Morphodynamics (RCEM 2009)(Vionnet C., et al., eds.) Pages: 825-831
  • Peer Reviewed
• [Journal Article] Effects of wave period on combined-flow bedforms a flume experiment. (2008)
  • Author(s): Sekiguchi T., Yokokawa M.
  • Journal Title: Marine and River Dune Dynamics III Pages: 281-284
  • Peer Reviewed
• [Presentation] A new bedform phase diagram for combined flows. (2010)
  • Author(s): Perillo M.M., Yokokawa M., Sekiguchi T., Takagawa T., Hasegawa Y., Pedocchi F., Best J., Garcia M.H.
  • Organizer: 18th International Sedimentological Congress.
  • Place of Presentation: Mendoza, Argentina
  • Year and Date: 20100900
• [Presentation] Vorticity distributions over combined-flow ripples. (2010)
  • Author(s): Takagawa T., Yokokawa M., Sekiguchi T., Azuma R.
  • Organizer: 18th International Sedimentological Congress.
  • Place of Presentation: Mendoza, Argentina
  • Year and Date: 20100900
• [Presentation] Bedform morphology under combined flows. (2010)
  • Author(s): Perillo M.M., Yokokawa M., Sekiguchi T., Takagawa T., Hasegawa Y., Pedocchi F., Garcia M.H., Best J.
  • Organizer: American Association of Petroleum Geologists Spring Meeting 2010.
  • Place of Presentation: New Orleans, U.S.A.
  • Year and Date: 20100400
• [Presentation] 複合流リップル上の流れ場解析 (2010)
  • Author(s): 高川智博・横川美和・関口智寛・東良慶
  • Organizer: 日本地質学会第117年学術大会(富山大会)
  • Place of Presentation: 富山大学
  • Year and Date: 2010-09-18
• [Presentation] 複合流リップル形成時の渦度の分布 (2010)
  • Author(s): 横川美和・大木浩司・工藤幸生・東良慶・関口智寛・高川智博
  • Organizer: 日本堆積学会2010年茨城大会
  • Place of Presentation: 茨城大学
  • Year and Date: 2010-03-27
• [Presentation] Bedform morphology under combined flows with a 6-second oscillation period. (2009)
  • Author(s): Yokokawa M., Sekiguchi T., Takagawa T., Perillo M.M., Hasegawa Y., Pedocchi F., Garcia M.H., Best J.
  • Organizer: American Geophygical Union Fall Meeting 2009.
  • Place of Presentation: San Francisco, U.S.A.
  • Year and Date: 2009-12-15
• [Presentation] 2009, Topography of ripples generated by combined waves and currents and surrounding water movement analyzed by PIV. (2009)
  • Author(s): Yokokawa M., Ohki K., Sekiguchi T., Takagawa T.
  • Organizer: River, Coastal and Estuarine Morphodynamics (RCEM 2009)
  • Place of Presentation: Santa Fe, Argentina
  • Year and Date: 2009-09-24
• [Presentation] 2009, Experimental study on formative conditions of hummocky bedforms (2009)
  • Author(s): Takagawa T., Masuda F.
  • Organizer: River, Coastal and Estuarine Morphodynamics (RCEM 2009)
  • Place of Presentation: Santa Fe, Argentina
  • Year and Date: 2009-09-22
• [Presentation] PIVによる複合流リップル周囲の流れ場解析 (2009)
  • Author(s): 横川美和・関口智寛・高川智博
  • Organizer: 第58回理論応用力学講演会.日本学術会議
  • Place of Presentation: 東京
  • Year and Date: 2009-06-09
• [Presentation] 複合流リップル周囲の流体場の特徴:PIVによる解析例 (2009)
  • Author(s): 横川美和・関口智寛・高川智博
  • Organizer: 日本堆積学会2009年京都枚方大会
  • Place of Presentation: 大阪工業大学
  • Year and Date: 2009-03-29
• [Presentation] 複合流状況の変化に伴うベッドフォームの変化:静岡県浜松市馬込川における現地観測 (2009)
  • Author(s): 平松遥奈・高川智博・横川美和・関口智寛・牛小静・佐藤愼司
  • Organizer: 日本堆積学会2009年京都枚方大会
  • Place of Presentation: 大阪工業大学
  • Year and Date: 2009-03-29
• [Remarks] ホームページ等
• [Remarks] 関口智寛
  • URL: http://www.suiri.tsukuba.ac.jp/~sekiguchi/
• [Remarks] 高川智博
  • URL: http://coastal.t.u-tokyo.ac.jp/takagawa/index.html