Development of Advanced Sediment Replenishment Methodology for Bedload Continuity below Dams

2022 Fiscal Year Annual Research Report

• Project/Area Number: 21H01434
• Research Institution: Kyoto University
• Principal Investigator: カントウシュ サメ・アハメド 京都大学, 防災研究所, 准教授 (70750800)
• 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)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: Numerical simulation / TELEMAC2D / Model calibration / Suspended sediment / Buech River / flood pulses / Sediment pulses / Replenishment Scenarios

Outline of Annual Research Achievements

Installation of additional monitoring systems of two IP Cameras, one on the bridge and one on the left bank of the river, for real-time sediment erosion patterns at the sediment replenishment site and surface flow velocities near the SR site. Additionally, install one turbidity meter to measure suspended sediment concentration. In total, four times field surveys at Naka River for measuring Grain Size Distribution (GSD) along four gravel bars, a drone for the sediment replenishment site, and morphological changes. Field visit and data collection of Buech River in France. Develop a comprehensive assessment method for sediment replenishment in the Naka and Buch Rivers, considering the erosion efficiency of replenished sediment and downstream eco-hydro-geomorphological impacts. We established a two-dimensional model to simulate the hydro-morphological changes with the implementation of SR in the Naka River based on TELEMAC-2D coupled with Gaia. The model was then calibrated and validated for previous flood events and the 2022 flood event. Then, based on the calibrated model, we utilized it to simulate several scenarios to investigate the optimization strategies of SR by considering replenishment erosion and downstream responses. There are rare significant floods that occurred recently in the Nagayasuguchi dam, indicating that an increase in flushing magnitude is difficult to implement under dam management.

Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

A Ph.D. study has been completed based on this project. We conducted field surveys in the Buech River in France and collected data on river cross-section, grain size distribution, and ecological indicators. Furthermore, we calibrated and validated the TELEMAC2D model and started the sensitivity analysis for optimal parameter selection. We compared Naka and Buech Rivers based on the developed comprehensive assessment approach. We have published this work and presented it at various conferences and meetings. We investigated the impacts of the flushing flow and the sediment volumes. We designed three scenarios for double flood pulses and additional sediment replenishment arrangements.

Strategy for Future Research Activity

Based on the well-developed 2D model, we will optimize the sediment replenishment works in the Naka River. We will propose a guideline for sediment replenishment implementation. The downstream morpho-ecology requires optimal flushing flow, volume, and sediment supply from the SR site to maintain its positive functionality. We will check the feasibility of implementing the double stockpiles at Kohama.

Research Products

• [Journal Article] Assessment of sediment yield and deposition in a dry reservoir using field observations, RUSLE and remote sensing: Wadi Assarin, Oman (2022)
  • Author(s): Al-Mamari, M., Kantoush, S.A., Al-Harrasi, T., Al-Maktoumi, A., Abdrabo, K., Saber, M. and T., Sumi
  • Journal Title: Journal of Hydrology Volume: 617 Pages: 128-892
  • DOI: 10.1016/j.jhydrol.2022.128982
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Hydrodynamics, sediment transport, and morphodynamics in the Vietnamese Mekong Delta: Field study and numerical modelling (2022)
  • Author(s): Binh, D.V., Kantoush, S.A., Ata, R., Tassi, P., Nguyen, T.V., Lepesqueur, J., Aberrezzak, K.E., Bourban, S.E., Nguyen, Q.H., Phuong, D. N., Trung, L.V., An, T.D., Letrung, and T., Sumi
  • Journal Title: Geomorphology Volume: 413(15) Pages: 108-368
  • DOI: 10.1016/j.geomorph.2022.108368
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Quantifying the impacts of hydraulic infrastructure on tropical stream flows (2022)
  • Author(s): Nguyen, B. Q., Kantoush, S. A., Saber, M., Binh, D. V., Vo, N. D., & Sumi, T.
  • Journal Title: Hydrological Processes Volume: 37(3) Pages: 148-34
  • DOI: 10.1002/hyp.14834
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Experimental Study Demonstrating a Cost-Effective Approach for Generating 3D-Enhanced Models of Sediment Flushing Cones Using Model-Based SFM Photogrammetry (2022)
  • Author(s): Haghjouei H., Kantoush, S.A., S Beiramipour, Rahimpour M., Qaderi K.
  • Journal Title: Water Volume: 14 Pages: 15-88
  • DOI: 10.3390/w14101588
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] 水制工を活用した交互砂州の固定化解消について (2022)
  • Author(s): 遠藤遼太郎・武藤裕則・田村隆雄
  • Organizer: 令和5年度土木学会四国支部技術研究発表会
• [Presentation] Comprehensive assessment of sediment replenishment and downstream hydro-morpho-ecology, case study in the Naka River, Japan and the Buch River, France (2022)
  • Author(s): Lin, Jiaqi, Kantoush Sameh, Sumi Tetsuya
  • Organizer: 12TH ICOLD EUROPEAN CLUB SYMPOSIUM
  • Int'l Joint Research / Invited