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Research interest: 研究テーマ
Research interest: 研究テーマ
High-resolution inundation flow simulation and its application to mitigate physical and environmental risks: 高解像洪水氾濫流解析と、その解析で評価される洪水氾濫流の水理特性に着目した物理的被害や環境への影響の評価と緩和
High-resolution inundation flow simulation and its application to mitigate physical and environmental risks: 高解像洪水氾濫流解析と、その解析で評価される洪水氾濫流の水理特性に着目した物理的被害や環境への影響の評価と緩和
Keywords: LiDAR, DEM, Finite volume method, Unstructured grid, railway, urban, mountainous
Advanced field monitoring of fluid flow and sediment transport in flooding rivers: 洪水中の河川の流れ・土砂・物質輸送の実測方法の開発と発展
Advanced field monitoring of fluid flow and sediment transport in flooding rivers: 洪水中の河川の流れ・土砂・物質輸送の実測方法の開発と発展
Keywords: Flow visualization, acoustic, pressure, sediment transport, turbulence, gravel bed rivers
Understanding the development process of river geomorphology and managing river geomorphology by utilizing natural processes: 河川の地形変化の予測と制御
Understanding the development process of river geomorphology and managing river geomorphology by utilizing natural processes: 河川の地形変化の予測と制御
Keywords: Gravel bed rivers, vegetation, numerical simulation
Recent activities
Recent activities
Participated the 7th Korea-Japan-Malaysia Mini-Symposium on Modeling and Measurement in Hydraulics at Kampar, Malaysia on June 27-28, 2025.
Participated the 7th Korea-Japan-Malaysia Mini-Symposium on Modeling and Measurement in Hydraulics at Kampar, Malaysia on June 27-28, 2025.
Presentation by Prof. Choi at Yonsei Univ.
On the way from Singapore to Kampar, we enjoyed the view of the countryside of Malaysia.
Small creek in Kampar's old city.
Participated IAHR Congress held at Singapore.
Participated IAHR Congress held at Singapore.
Made a presentation entitled: Unsteady Features of Bedload and Near-Bed Turbulence Measured in a Braided Gravel Bed River
My visit time in Singapore this time is very short but succeeded to see a legendary lion!
Sunny and beautiful sunset. Able to talk with many friends at the conference venue!
Prepaid card for transport with Hangyodon!
Field survey at the Satsunai River, Hokkaido, Japan (札内川で現地調査)
Field survey at the Satsunai River, Hokkaido, Japan (札内川で現地調査)
機器を預かっていただいている帯広畜産大学でちょうど寮祭が行われていて，ザリガニ味噌汁などを堪能しました．
現地は水位が高く，十分な準備が出来なかったため，あまり良い現地調査にはなりませんでしたが，無事に完了することができました．
北見工業大学の吉川先生の研究室も訪問しました．急な訪問にもかかわらずご案内いただきありがとうございました！
河川観測高度化シンポジウムに参加
河川観測高度化シンポジウムに参加
2025年6月21日に中央大学後楽園キャンパス５号館で開催された，2025年河川観測高度化シンポジウムに参加し，「流量観測の誤差について」という話題提供も行いました．懇親会にも参加して，いろんな意見交換ができました．
Participated River Engineering Symposium (河川技術シンポジウム)
Participated River Engineering Symposium (河川技術シンポジウム)
2025年6月19日，20日に四ッ谷の土木学会で開催された河川技術シンポジウムに参加いたしました．多くの方に直接お会いできそれぞれの近況をしることができました．
運営のみな様，スムーズで充実した運営，ありがとうございます！
Visited the Yahagi River (矢作川視察)
Visited the Yahagi River (矢作川視察)
Visited the Yahagi River from the upstream Yahagi Dam to the downstream tidal reach, with the guidance of river manager in April 2025. Four students were also joined to see how the river and its water are managed.
Yahagi dam: Waiting water discharge from a gate for the maintenance.
Sediment stockpile: Sediment was moved from the dam reservoir to the downstream to restore natural sediment flow.
View from the Toyota Stadium: The Riverside promenade has been designed to provide a space for people to enjoy a variety of activities.
Study supervision
Study supervision
Funding and research proposal of master's, doctoral and post-doctoral studies
Funding and research proposal of master's, doctoral and post-doctoral studies
Hiring master's and doctoral students for research projects is not very common in labs in Japanese universities.
Those interested in joining us will either have to pay your expenses or apply for a scholarship. Scholarships are either private or public.
For post-doctoral study, JSPS provides postdoctoral fellowships.
Self-driven research projects are quite important in master's and especially doctoral course. Accordingly, the research proposal by the applicant is quite important. I can advise but the proposal must be prepared by the applicant.
To consult on the master, doctoral, and post-doctoral studies, send your research proposal and C.V. by e-mail.
Description of selected papers
Description of selected papers
Image motion analysis of sediment particles migrating on dunes
Image motion analysis of sediment particles migrating on dunes
Tsubaki, R., Baranya, S., Muste, M. and Toda, Y.: Spatio-temporal patterns of sediment particle movement on 2D and 3D bedforms, Experiments in Fluids, Vol. 59, No. 93, 2018. Post-print, View-only-version.
Flood Risk Assessment of the Middle Reach of the Helmand River, Afghanistan
Flood Risk Assessment of the Middle Reach of the Helmand River, Afghanistan
K Sefat, R Tsubaki: Flood Risk Assessment of the Middle Reach of the Helmand River, Afghanistan, Journal of Disaster Research 19 (2), 455-464, 2024. Journal link.
A glacial lake outburst flood risk assessment for the Phochhu river basin, Bhutan
A glacial lake outburst flood risk assessment for the Phochhu river basin, Bhutan
T Wangchuk, R Tsubaki: A glacial lake outburst flood risk assessment for the Phochhu river basin, Bhutan, Natural Hazards and Earth System Sciences 24 (7), 2523-2540, 2024. Journal link.
Effects of vegetation distribution along river transects on the morphology of a gravel bed braided river
Effects of vegetation distribution along river transects on the morphology of a gravel bed braided river
R Zhu, R Tsubaki, Y Toda: Effects of vegetation distribution along river transects on the morphology of a gravel bed braided river, Acta Geophysica, 72 (2), 1097-1112, 2024. Journal link.
Impact Assessment of Flushing Flow from a Dam to Invasive Aquatic Plant Egeria densa in a Gravel-bed River
Impact Assessment of Flushing Flow from a Dam to Invasive Aquatic Plant Egeria densa in a Gravel-bed River
R Tsubaki, Y Kawahara, Y Mizuguchi: Impact Assessment of Flushing Flow from a Dam to Invasive Aquatic Plant Egeria densa in a Gravel-bed River, KSCE Journal of Civil Engineering 28 (3), 1062-1074, 2024. Journal link.
Experiment to clarify the condition of railway embankment scour
Experiment to clarify the condition of railway embankment scour
Tsubaki, R., Kawahara, Y. and Ueda, K.: Railway embankment failure due to ballast layer breach caused by inundation flows, Natural Hazards, Vol. 87, No. 2, doi: 10.1007/s11069-017-2789-3, 2017, Post-print, Journal link.
Fragility curve for railway embankment scour
Fragility curve for railway embankment scour
Tsubaki, R., Bricker, J.D., Ichii, K. and Kawahara, Y.: Development of fragility curves for railway embankment and ballast scour due to overtopping flow, Natural Hazards and Earth System Sciences, EGU, Vol. 16, 2455-2472, doi:10.5194/nhess-16-2455-2016, Paper.
Sediment budgeting using detailed bathymetry maps: Acoustic mapping velocimetry (AMV)
Sediment budgeting using detailed bathymetry maps: Acoustic mapping velocimetry (AMV)
Muste, M., Baranya, S., Tsubaki, R., Kim, D., Ho, H., Tsai, H. and Law, D.: Acoustic mapping velocimetry, Water Resources Research, Vol. 52, doi: 10.1002/2015WR018354, 2016.5, Journal link, Paper.
Spatial interpolation of river ADCP data
Spatial interpolation of river ADCP data
Tsubaki, R., Kawahara, Y., Muto, Y. and Fujita, I.: New 3-D flow interpolation method on moving ADCP data, Water Resources Research, Abstract, Paper, Repository
Development of image based flow measurement method and utilization to open water flow analysis
Development of image based flow measurement method and utilization to open water flow analysis
Multi-camera large-scale particle image velocimetry
Multi-camera large-scale particle image velocimetry
Tsubaki, R.: Multi-camera large-scale particle image velocimetry. Measurement Science and Technology, doi: 10.1088/1361-6501/ab85d5, 2020, Post-print, Journal link.
On the Texture Angle Detection Used in Space-Time Image Velocimetry
On the Texture Angle Detection Used in Space-Time Image Velocimetry
Tsubaki, R.: On the Texture Angle Detection Used in Space-Time Image Velocimetry (STIV), Water Resources Research, Vol. 53(12), doi: 10.1002/2017WR021913, pp.10908-10914, 2017, Post-print, Journal link.
Smartphone apps for river flow measurement (LSPIV apps for iOS and Android)
Smartphone apps for river flow measurement (LSPIV apps for iOS and Android)
Tsubaki, R., Fujita, I., Yu, K. and Muste, M.: Large-scale particle image velocimetry (LSPIV) implementation on smartphone, Proceedings of 36th IAHR congress, ISBN: 978-90-824846-0-1, Paper number 3874 on WEB site, Hague, Netherlands, June 28, 2015. Link
Innovation on river monitoring and its application on eco-hydraulics assessment
Innovation on river monitoring and its application on eco-hydraulics assessment
Development and refinement of methods for measuring water and sediment flow during floods, and assessment of those impact of river ecosystem (riparian and aquatic plants and attached algae)
Development and refinement of methods for measuring water and sediment flow during floods, and assessment of those impact of river ecosystem (riparian and aquatic plants and attached algae)
Compact geophone
Compact geophone
Tsubaki, R., Kawahara, Y., Zhang, X and Tsuboshita, K.: A new geophone device for understanding environmental impacts caused by gravel bedload during artificial floods, Water Resources Research, Vol. 53, doi: 10.1002/2016WR019726, 2017, Journal link, Paper, Post-print.
Flood inundation flow modeling
Flood inundation flow modeling
Railway embankment overtopping
Railway embankment overtopping
Uncertainty assessment of the calculated result
Uncertainty assessment of the calculated result
Tsubaki, R. and Kawahara, Y.: The uncertainty of Local Flow Parameters During Inundation Flow Over Complex Topographies with Elevation Errors, Journal of Hydrology, Vol.486, 2013. Journal link, Repository
Mesh generation using LiDAR data
Mesh generation using LiDAR data
Tsubaki, R., Fujita, I.: Unstructured grid generation using LiDAR data for urban flood inundation modelling, Hydrological Processes, Vol. 24, No. 11, pp. 1404-1420, 2010, Abstract, Paper, Repository
Investigation of flow in a channel in Japanese garden
Investigation of flow in a channel in Japanese garden
Tsubaki, R., Nakayama, Y. and Fujita, I.: The design secret of Kyokusui-no-En's meandering channel, Journal of Visualization, Vol. 11, No. 3, pp. 265-272, 2008.7. Abstract, Repository
River flow
River flow
Morphological evolution of river topography
Morphological evolution of river topography
Flow with vegetation
Flow with vegetation
Numerical flow simulation (CFD)
Numerical flow simulation (CFD)
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