Details zur Publikation |
| Kategorie | Textpublikation |
| Referenztyp | Zeitschriften |
| DOI | 10.1016/j.geomorph.2022.108368 |
| Volltext | Akzeptiertes Manuskript |
| Titel (primär) | Hydrodynamics, sediment transport, and morphodynamics in the Vietnamese Mekong Delta: Field study and numerical modelling |
| Autor | Binh, D.V.; Kantoush, S.A.; Ata, R.; Tassi, P.; Nguyen, V.T.
; Lepesqueur, J.; Abderrezzak, K.E.K.; Bourban, S.E.; Nguyen, Q.H.; Phuong, D.N.L.; Trung, L.V.; Tran, D.A.; Letrung, T.; Sumi, T. |
| Quelle | Geomorphology |
| Erscheinungsjahr | 2022 |
| Department | HDG |
| Band/Volume | 413 |
| Seite von | art. 108368 |
| Sprache | englisch |
| Topic | T5 Future Landscapes |
| Supplements | https://ars.els-cdn.com/content/image/1-s2.0-S0169555X22002616-mmc1.docx |
| Keywords | Morphological change; Diversion channel; Riverbed incision; Scour hole; Sediment reduction; 2D numerical modelling |
| Abstract | Flow, suspended sediment transport and associated
morphological changes in the Vietnamese Mekong Delta (VMD) are studied using
field survey data and a two-dimensional (2D) depth-averaged hydromorphodynamic
numerical model. The results show that approximately 61–81 % of the suspended
sediment load in the Hau River during the flood seasons is diverted from the
Tien River by a water and suspended sediment diversion channel. Tidal effects
on flow and suspended sediment load are more pronounced in the Hau River than
in the Tien River. The results show the formation of nine scour holes in the
Tien River and seven scour holes in the Hau River from 2014 to 2017. Additional
six scour holes are likely to form by the end of 2026 if the suspended sediment
supply is reduced by 85 % due to damming. Notably, the scour holes are likely
to form at locations of severe riverbank erosion. In the entire study area, the
simulated total net incision volume in 2014–2017 is approximately 196 Mm3
(equivalent to 65.3 Mm3/yr). The predicted total net incision volumes from 2017
to 2026 are approximately 2472 and 3316 Mm3 under the 18 % and 85 % suspended
sediment reduction scenarios, respectively, thereby likely threatening the
delta sustainability. The methodology developed in this study is helpful in
providing researchers and decision-makers with one way to predict numerically
the scour hole formation and its association with riverbank stability in river
deltas. Of equal importance, this research serves as a useful reference on the
role of water and suspended sediment diversion channels in balancing landforms
in river-delta systems, particularly where artificial diversion channels are
planned.
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| dauerhafte UFZ-Verlinkung | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=26329 |
| Binh, D.V., Kantoush, S.A., Ata, R., Tassi, P., Nguyen, V.T., Lepesqueur, J., Abderrezzak, K.E.K., Bourban, S.E., Nguyen, Q.H., Phuong, D.N.L., Trung, L.V., Tran, D.A., Letrung, T., Sumi, T. (2022): Hydrodynamics, sediment transport, and morphodynamics in the Vietnamese Mekong Delta: Field study and numerical modelling Geomorphology 413 , art. 108368 10.1016/j.geomorph.2022.108368 |
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