Hydraulic study on river vegetation dynamics for efficient river management tasks

• Project/Area Number: 26820203
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Hydraulic engineering
• Research Institution: Okayama University
• Principal Investigator: YOSHIDA KEISUKE 岡山大学, 環境生命科学研究科, 准教授 (50436721)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2014: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 河道の樹林化 / 植生消長モデル / 植生の流水抵抗の逆推定 / データ同化モデル / 植生の流水抵抗 / 植生動態モデル

Outline of Final Research Achievements

This study elucidates both vegetation dynamics and flow resistance because of vegetation establishment in the lower Asahi River flowing through Okayama city. For that purpose, we conducted field observations at three local sites in the river. We also developed both a vegetation dynamics model and a sequential data assimilation method (particle filter) for hydraulic numerical simulations. Results show that the vegetation dynamics model works well in a qualitative manner: it can reproduce the characteristics of both vegetation establishment and bed deformation that occurred at targeted local sites in the past decade or so. They also show that the data assimilation results give a reasonable explanation for the spatial distribution of roughness values due to the difference of rate of vegetation species establishing in subregions of the lower Asahi River.

Research Products

• [Journal Article] ALBを用いた河道地形計測の精度検証と流況解析の改善効果の検討 (2017)
  • Author(s): 吉田圭介，前野詩朗，間野耕司，山口華穂，赤穗良輔
  • Journal Title: 土木学会論文集B1(水工学) Volume: 73 Pages: 565-570
  • NAID: 130006406283
  • Peer Reviewed
• [Journal Article] 適正な分流量を維持するための百間川分流部の固定堰周辺における植生管理方策の検討 (2017)
  • Author(s): 平井康隆，前野詩朗，吉田圭介，岩城智大，小川修平，赤穗良輔
  • Journal Title: 土木学会論文集B1(水工学) Volume: 73 Pages: 1081-1086
  • NAID: 130006406142
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 植生消長モデルを用いた礫河原再生後の物理環境変化の検証 (2016)
  • Author(s): 平井康隆，前野詩朗，吉田圭介，藤田駿佑，赤穗良輔
  • Journal Title: 土木学会論文集B1(水工学) Volume: 72 Pages: 1063-1068
  • NAID: 130005311962
  • Peer Reviewed
• [Journal Article] 旭川祇園地区における経年変化を考慮した礫河原再生効果の検討 (2016)
  • Author(s): 前野詩朗，吉田圭介，平井康隆，岩城智大，山口華穂，藤田駿佑
  • Journal Title: 土木学会論文集B1(水工学) Volume: 72 Pages: 1069-1074
  • NAID: 130005311960
  • Peer Reviewed
• [Journal Article] 洪水時の河道内植生による流水抵抗の逆推定手法の検討， (2016)
  • Author(s): 吉田圭介，前野詩朗
  • Journal Title: 土木学会論文集B1(水工学) Volume: 72 Pages: 1075-1080
  • NAID: 130005311958
  • Peer Reviewed
• [Journal Article] Flood hydrograph estimation using an adjoint shallow-water model (2015)
  • Author(s): Keisuke Yoshida and Tadaharu Ishikawa
  • Journal Title: Journal of Hydro-environmental Research Volume: 9 Issue: 3 Pages: 429-440
  • DOI: 10.1016/j.jher.2014.12.003
  • Peer Reviewed
• [Journal Article] 旭川における植生分布の経年変化を考慮した洪水流の数値解析 (2015)
  • Author(s): 吉田圭介，前野詩朗，藤田駿佑，松山悟，岩城智大，平井康隆
  • Journal Title: 土木学会論文集B1(水工学) Volume: 71
  • NAID: 130005123470
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] GPUによる分流を含む洪水流計算の高速化 (2015)
  • Author(s): 吉田圭介，田中龍二，前野詩朗
  • Journal Title: 土木学会論文集B1(水工学) Volume: 71
  • NAID: 130005123627
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Inverse estimation of distributed roughness coefficients in vegetated flooded rivers (2014)
  • Author(s): Keisuke Yoshida and Shiro Maeno
  • Journal Title: Journal of Hydraulic Research Volume: 52 Issue: 6 Pages: 811-823
  • DOI: 10.1080/00221686.2014.932854
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] Sequential data assimilation for estimating bed roughness of vegetated flooded rivers (2016)
  • Author(s): K. Yoshida
  • Organizer: 20th IAHR-APD Congress
  • Place of Presentation: スリランカ，コロンボ
  • Year and Date: 2016-08-29
  • Int'l Joint Research
• [Presentation] Forestation control works: secular change at the Gion area in the Asahi River (2016)
  • Author(s): K. Yamaguchi
  • Organizer: 20th IAHR-APD Congress
  • Place of Presentation: スリランカ，コロンボ
  • Year and Date: 2016-08-29
  • Int'l Joint Research
• [Presentation] Improvement of diversion weir and surrounding vegetation condition effects on diversion discharge in the Asahi River (2016)
  • Author(s): K. Yoshida
  • Organizer: 20th IAHR-APD Congress
  • Place of Presentation: スリランカ，コロンボ
  • Year and Date: 2016-08-29
  • Int'l Joint Research
• [Presentation] Prediction of forestaion process in the Asahi river, Japan using a vegetation dynamics model (2014)
  • Author(s): K. Yoshida, S. Maeno, S. Fujita, S. Matsuyama
  • Organizer: 19th IAHR-APD Congress
  • Place of Presentation: Hanoi, Vietnam
  • Year and Date: 2014-09-22
• [Presentation] Development and application of vegetation dynamics model for effective river management tasks in the Asahi River (2014)
  • Author(s): K. Yoshida, S. Maeno, S. Matsuyama & S. Fujita
  • Organizer: River Flow 2014
  • Place of Presentation: Lausanne, Switzerland
  • Year and Date: 2014-09-05