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Article

Identifying Flow Eddy Currents in the River System as the Riverbank Scouring Cause: A Case Study of the Mekong River

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Faculty of Engineering, Technology, and Environment, An Giang University, Long Xuyen City 880000, Vietnam
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Vietnam National University-Ho Chi Minh City, Ho Chi Minh City 700000, Vietnam
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Department of Civil Engineering, National Yang Ming Chiao Tung University, Taipei City 112304, Taiwan
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School of Engineering, Deakin University, Geelong, VIC 3216, Australia
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An Giang Province Hydro-Meteorological Center, Long Xuyen City 880000, Vietnam
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An Giang Province Department of Environment and Natural Resources, Long Xuyen City 880000, Vietnam
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Faculty of Information Technology, An Giang University, Long Xuyen City 880000, Vietnam
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Author to whom correspondence should be addressed.
Academic Editor: Ian Prosser
Water 2022, 14(15), 2418; https://doi.org/10.3390/w14152418
Received: 11 May 2022 / Revised: 24 July 2022 / Accepted: 26 July 2022 / Published: 4 August 2022
River morphological change is the complex evolution of riverbed states, which can lead to serious riverbank failures, and is a worldwide concern. However, revealing the cause of the evolution, in particular, the potential morphological scouring by eddy currents, is difficult. Accordingly, we propose a comprehensive combination of 2D and 3D simulations to reveal the eddy currents. We selected the Vam Nao, part of the Mekong River, with semi-tidal effects and confluence flows as the case study. We created two unstructured 40 m × 40 m triangular meshes using inverse distance interpolation. This study used the Saint–Venant equations (TELEMAC2D) and Navier–Stokes equations (TELEMAC3D) to reveal the eddy currents for 2009, 2017, and 2018. TELEMAC2D (the simplified form of TELEMAC3D) was assessed for 15 days, 3 months, and 1 year, which met a satisfactory level. The eddy currents’ appearance was verified by local knowledge. We found recirculating currents near the riverbank to the East (right at the riverbank failures), whose velocity was approximately half and 1/3–1/4 of the mainstream flow velocity in the dry and flood seasons, respectively. Our study approach performed well in revealing the eddy currents, which can aid in assessing potential riverbank failures and can be applicable to similar contexts. View Full-Text
Keywords: riverbank erosion; 2D and 2D hydrologic modeling; eddy currents riverbank erosion; 2D and 2D hydrologic modeling; eddy currents
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MDPI and ACS Style

Nguyen, T.T.N.; Shih, D.-S.; Chua, L.H.; Kieu, H.N.; Ha, L.H.; Nguyen, L.H.; Luu, N.V.; Huynh, T.V.; Duong, L.M.; Ngo, A.T.; Nguyen, H.V.; Tran, C.N. Identifying Flow Eddy Currents in the River System as the Riverbank Scouring Cause: A Case Study of the Mekong River. Water 2022, 14, 2418. https://doi.org/10.3390/w14152418

AMA Style

Nguyen TTN, Shih D-S, Chua LH, Kieu HN, Ha LH, Nguyen LH, Luu NV, Huynh TV, Duong LM, Ngo AT, Nguyen HV, Tran CN. Identifying Flow Eddy Currents in the River System as the Riverbank Scouring Cause: A Case Study of the Mekong River. Water. 2022; 14(15):2418. https://doi.org/10.3390/w14152418

Chicago/Turabian Style

Nguyen, Tanh T. N., Dong-Sin Shih, Lloyd HC Chua, Huyen N. Kieu, Linh H. Ha, Linh H. Nguyen, Ninh V. Luu, Thai V. Huynh, Linh M. Duong, An T. Ngo, Hoa V. Nguyen, and Chau N. Tran. 2022. "Identifying Flow Eddy Currents in the River System as the Riverbank Scouring Cause: A Case Study of the Mekong River" Water 14, no. 15: 2418. https://doi.org/10.3390/w14152418

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