Ryota TSUBAKI
Research interest
High resolution inundation flow simulation and its application to mitigate physical and environmental risks
Keywords: LiDAR, DEM, Finite volume method, Unstructured grid, railway, urban, mountainous
Advanced field monitoring of fluid flow and sediment transport
Keywords: Flow visualization, acoustic, pressure, sediment transport, turbulence, gravel bed rivers
Understanding and control of river geomorphology
Keywords: Gravel bed rivers, vegetation, numerical simulation
Recent activities
Recent activities
川のふるさと交流館 さらら
2024.12に北海道旭川のこちらの施設を訪問し，流量観測に関する勉強会に参加しました．
味噌ラーメン
旭川名物！
北海道へそ祭り 人形
なんで大きな帽子を被っているのかが分った！
Visited Gifu with Prof. Cooper from UK
Prof. Cooper from Liverpool visited Nagoya, and we went to Gifu to explore the Kiso and Nagara Rivers on Dec. 2024. We also visited the river restoration research center (see the left photos).
Participated in the 7th China-Japan-South Korea Water Science Forum-Flood Simulation and Management 2024 at Xi'an, China
I participated in a forum held at Xi'an University of Technology, which is co-hosted by Xi'an University of Technology, Jilin University, and the Qinba Research Branch of China Society of Natural Resources. We visited with Prof. Zhang from Kumamoto, and Dr. Kim from Kyoto. The organizing teams at both Xi'an and Jilin did an excellent job. I would like to extend my gratitude to Prof. Hou from Xi'an University of Technology and Dr. Feng from Jilin University.
Throughout the forum, I engaged in discussions with a diverse group of participants, ranging from senior academics to students, all of whom are actively involved in research and exchange.
The city itself is rich in monumental sites, and many, including local residents, are enjoying the historical atmosphere. Xi'an has a long-standing history of international exchange.
Study supervision
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
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
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
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
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
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
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
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)
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
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
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
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)
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
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
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
Railway embankment overtopping
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
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
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
Morphological evolution of river topography
Flow with vegetation
Numerical flow simulation (CFD)
LES (Large eddy simulation) coupled with VOF (Volume of fluid) water surface deformation