Estimation of attached-algae removal amount in gravel-river based on field observation of spatio-temporal distribution of sediment transport

• Project/Area Number: 26820205
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Hydraulic engineering
• Research Institution: Hiroshima University
• Principal Investigator: Tsubaki Ryota 広島大学, 工学(系)研究科(研究院), 助教 (80432566)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2014: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: 洪水 / フラッシュ放流 / 土砂移動 / ハイドロフォン / 付着藻類

Outline of Final Research Achievements

A method to monitor spatio-temporal distribution of graded sediment transport during small/medium flood events was developed. This method was utilized to understand the contribution of sediment transport on attached-algae removal in a section of gravel-bed river during flushing flow events. It was found that transport of medium-sized gravel (d=0.5 to 3 cm) is quite limited even if there is supply from upstream. This is because medium-sized gravel has been trapped in the dents formed between the larger gravels and cobbles. This implies that the contribution of gravel transport during small/medium floods in the focused river section on the attached-algae removal is negligible.

Research Products

• [Int'l Joint Research] アイオワ大学水理研究所(米国)
• [Journal Article] フラッシュ放流によるダム下流区間における外来沈水植物の流出動態 (2016)
  • Author(s): 田中俊介，椿 涼太，河原能久，小手川勇太
  • Journal Title: 土木学会論文集B1(水工学) Volume: 72 Pages: 1117-1122
  • NAID: 130005311879
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] STUDY ON MEASUREMENT OF BED-LOAD IN GRAVEL-BED RIVER UTILIZING DIGITAL SOUND RECORDER (2015)
  • Author(s): 坪下健太郎，椿 涼太，河原能久
  • Journal Title: Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) Volume: 71 Issue: 4 Pages: I_823-I_828
  • DOI: 10.2208/jscejhe.71.I_823
  • NAID: 130005123525
  • ISSN: 2185-467X
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 付着藻類の構成と衝突粒子径の効果を踏まえた藻類剥離モデルの開発 (2014)
  • Author(s): 石尾将大，椿 涼太，河原能久
  • Journal Title: 土木学会河川技術論文集 Volume: 20 Pages: 109-115
  • Peer Reviewed
• [Journal Article] 衝突音を利用した礫河川の小規模洪水時の掃流砂観測手法の開発 (2014)
  • Author(s): 椿 涼太，坪下健太郎，河原能久
  • Journal Title: 土木学会河川技術論文集 Volume: 20 Pages: 49-55
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] 礫河川に繁茂するオオカナダモの消長における出水攪乱規模と水温の変化の影響 (2016)
  • Author(s): 椿 涼太，河原能久
  • Organizer: 土木学会第71回年次学術講演会
  • Place of Presentation: 仙台市
  • Year and Date: 2016-09-07
• [Presentation] フラッシュ放流にあわせた中礫の瀬への土砂還元の試行 (2016)
  • Author(s): 椿 涼太，坪下健太郎，河原能久
  • Organizer: 平成28年度土木学会中国支部研究発表会
  • Place of Presentation: 広島市
  • Year and Date: 2016-05-21
• [Presentation] 出水規模の違いによるオオカナダモの流出形態と流出量の変化の分析 (2016)
  • Author(s): 小手川勇太，椿 涼太，河原能久
  • Organizer: 平成28年度土木学会中国支部研究発表会
  • Place of Presentation: 広島市
  • Year and Date: 2016-05-21
• [Presentation] Interannual flood impact on aquatic plant cover (2016)
  • Author(s): Tsubaki, R., Tanaka, S. and Kawahara, Y.
  • Organizer: 11th International Symposium on Ecohydraulics
  • Place of Presentation: Melbourne, Australia
  • Year and Date: 2016-02-08
  • Int'l Joint Research
• [Presentation] Numerical estimation of saltation gravel transport on irregular bed (2015)
  • Author(s): Tsubaki, R., Kawahara, Y. and Ayaka, K.
  • Organizer: 36th IAHR congress
  • Place of Presentation: Hague, Netherland
  • Year and Date: 2015-06-28
  • Int'l Joint Research
• [Presentation] Sediment transport measurement in field and laboratory (2015)
  • Author(s): Ryota Tsubaki
  • Organizer: International symposium on regulation of water cycle in river basin and disaster prevention
  • Place of Presentation: Chendu, China
  • Year and Date: 2015-01-07
  • Invited
• [Presentation] Removal of aquatic plants in a gravel-bed river during flushing flows (2014)
  • Author(s): Tsubaki, R. and Kawahara, Y.
  • Organizer: 10th International Symposium on Echohydraulics 2014 (ISE2014)
  • Place of Presentation: Trondheim, Norway
  • Year and Date: 2014-06-23 – 2014-06-27
• [Presentation] Spatio-temporal distribution of bed-load transport in a gravel-bed river during flushing flow (2014)
  • Author(s): Tsubaki, R., Kawahara, Y. and Tsuboshita, K.
  • Organizer: 10th International Symposium on Echohydraulics 2014 (ISE2014)
  • Place of Presentation: Trondheim, Norway
  • Year and Date: 2014-06-23 – 2014-06-27
• [Presentation] 衝突音を利用した礫河川の掃流砂観測手法の開発 (2014)
  • Author(s): 坪下健太郎，椿 涼太，河原能久
  • Organizer: 平成26年度土木学会中国支部研究発表会
  • Place of Presentation: 松江工業高等専門学校
  • Year and Date: 2014-05-31