2021 Fiscal Year Annual Research Report
Development of Advanced Sediment Replenishment Methodology for Bedload Continuity below Dams
| Project/Area Number |
21H01434
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
武藤 裕則 徳島大学, 大学院社会産業理工学研究部(理工学域), 教授 (40263157)
角 哲也 京都大学, 防災研究所, 教授 (40311732)
竹門 康弘 京都大学, 防災研究所, 准教授 (50222104)
小柴 孝太 京都大学, 防災研究所, 助教 (80883157)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | Sediment Replenishment / Imaged- based-technique / LSPIV and STIV / Basegrain / Naka River / Sediment erosion rate / Flushing flow / SR assessment method |
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| Outline of Annual Research Achievements |
Installation of two IP Cameras monitoring systems for real-time flow pattern, surface velocity, water level, and flow discharge measurements. Three times field surveys at Naka River for measuring Grain Size Distribution (GSD) along four gravel bars, drone for the sediment replenishment site and morphological changes. LSPIV and STIV were further used for real-time measurement of flow patterns. The STIV proved more reliable for measuring flow velocity and discharge. Collection of long-term data time series for riverbed substrates, fish surveys, and geomorphological changes. The water depth and flow velocity were collected in 2015, 2016, and 2020 during the average flow period in spring and autumn. We developed an image-based approach for detecting the flow velocities, and sediment erosion rate at the replenishment site. A unified methodological approach for assessing the riverine system during SR was developed. Moreover, two primary aspects of river morphology, channel adjustment, and riverbed substrates, were considered to analyze the reasons for indicators alterations. The analysis of SR efficiency was conducted at two replenishment sites upstream and downstream of the Kohama Bridge from 2009 to 2020. The efficiency of replenishment in the Naka River is not higher due to the location of the stockpile and the considerable volume of placed sediment. Continuous SR with additional sediment input should be considered to utilize the remaining sediment at the replenishment site effectively.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The project progressively developed with the data collection, and we could conduct various field surveys for sediment replenishment sites. Furthermore, we developed the SR assessment method and start preparation for the numerical model. We have published several Journal papers and prepared online-training courses for the STIV software related to surface flow velocity. Drone surveys for the sediment replenishment site and downstream reaches. The assessment method has been developed based on detailed indicators.
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| Strategy for Future Research Activity |
Establishment of a 2D numerical model to simulate the SR works in the Naka River based on TELEMAC-2D coupled with Gaia. Sensitivity analysis is conducted based on the variation of several numerical and physical parameters. Due to the limitation of available data, the best model parameters are set to evaluate the erosion process of the replenished stockpile and downstream morphological changes based on the results of sensitivity analysis. Calibration and validation for the numerical model TELEMAC-2D and visiting France to compare between the Naka River and Buech River for comparative study and develop the comprehensive assessment.
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Research Products
(10 results)
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[Journal Article] Local flow convergence, bed scour, and aquatic habitat formation during floods around wooden training structures placed on sand-gravel bars2022
Author(s)
Kobayashi, S., Kantoush, S. A., Al Mamari, M. M., Tazumi, M., Takemon, Y., Sumi, T.
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Journal Title
Science of The Total Environment
Volume: 817
Pages: 152-992
DOI
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Study of Discharge Adjustment Effects on Reservoir Morphodynamics and Flushing Efficiency: An Outlook for the Unazuki Reservoir2021
Author(s)
Esmaeili, T., Sumi, T., Kantoush, S. A., Kubota, Y., Haun, S., Niles, N.
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Journal Title
Water
Volume: 13(12)
Pages: 1624-1646
DOI
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] Investigating the Turbidity Current Venting Operation from Multiple Outlets by Using TELEMAC-3D2021
Author(s)
Chen, P.A., Kantoush, S.A., Sumi, T., Binh, D.V., Bourban, S., Ata, R.
Organizer
39th IAHR World Congress, Granada, Spain
Int'l Joint Research / Invited
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[Presentation] Kantoush, S. A., Al Mamari, M. M., Kobayashi, S., Takemon, Y., Saber, M., Habiba, O., Sumi, T., Tazumi, M.2021
Author(s)
Flow patterns and bed changes due to traditional river training structures “Seigyu”
Organizer
Proceedings of River Flow 2020
Int'l Joint Research / Invited
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