Water Science and Engineering 2013, 6(2) 178-188 DOI:   10.3882/j.issn.1674-2370.2013.02.006  ISSN: 1674-2370 CN: 32-1785/TV

Current Issue | Archive | Search                                                            [Print]   [Close]
Information and Service
This Article
Supporting info
Service and feedback
Email this article to a colleague
Add to Bookshelf
Add to Citation Manager
Cite This Article
Email Alert
back siltation
navigation channel
sediment transport
Dinh An Estuary
Article by Viet-Thanh,.N
Article by Zheng,J.H

Mechanism of back siltation in navigation channel in Dinh An Estuary, Vietnam

Viet-Thanh NGUYEN1, 2, 3, Jin-hai ZHENG*1, 2, Ji-sheng ZHANG1, 2

1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, P. R. China
2. College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, P. R. China
3. Faculty of Civil Engineering, University of Transport and Communications, Hanoi, Vietnam


The Dinh An Estuary is one of the Nine Dragon estuaries of the Mekong River. An international navigation channel was built in the estuary for vessels traveling from the South China Sea to the southwestern area of Vietnam and then to Phnom Penh, Cambodia. The morphological evolution of the navigation channel is complicated and unstable. The back siltation intensity in the navigation channel has largely increased and been concentrated in the curvature segments of the channel since 1980. In this study, based on simulation results and measured data, five key factors that influence the back siltation in the navigation channel were systematically analyzed. These factors included the increasing elevation gap between the channel and the nearby seabed, the disadvantageous hydrodynamic conditions, sediment transport, mixing of saltwater and freshwater, and wave effects in the navigation channel. It is shown that the back siltation to a large extent results from the low current velocity of the secondary ocean circulation, which often occurs in the curvature segments of the channel. Suspended sediment also settles in the channel due to the decrease of the current velocity and the sediment transport capacity when flow passes through the channel. The changes of hydrodynamic conditions are responsible for the majority of the severe siltation in the curvature segments of the navigation channel.

Keywords back siltation   hydrodynamics   navigation channel   sediment transport   Dinh An Estuary  
Received 2012-08-31 Revised 2013-02-21 Online: 2013-04-05 
DOI: 10.3882/j.issn.1674-2370.2013.02.006

This work was supported by the 322 Project of Vietnam International Education Development, Ministry of Education and Training, Vietnam (Grant No. 322), the Qing Lan Project, the 333 Project of Jiangsu Province (Grant No. BRA2012130), the Fundamental Research Funds for the Central Universities (Grant No. 2012B06514), and the 111 Project (Grant No. B12032).

Corresponding Authors: Jin-hai ZHENG
Email: jhzheng@hhu.edu.cn
About author:


An, N. N. 1994. Numerical Model to Simulate the Hydrodynamic and Proposed Regulation Scheme to Improvement Navigation Channel in Dinh An Estuary. Ho Chi Minh City: Ho Chi Minh City University of Technology. (in Vietnamese)

An, T. V. 2005. Study the Solutions to Stabilized Bed of Channel in Dinh An Estuary Service to Waterway Transport. Hanoi: Vietnam Ministry of Science and Technology, Hanoi, Vietnam. (in Vietnamese)

Hau, L. P. 2005. Estuarine Hydrodynamic and Engineering. Hanoi: Construction Publishing. (In Vietnamese)

Hung, L. M. 1988. Morphological Evolution of Dinh An Estuary Before and After Dredging. Hanoi: Ministry of Transport. (in Vietnamese)

Nguyen, T. V., and Tanaka, H. 2007. Study on the effect of morphology change on salinity distribution in the Dinh An Estuary, Lower Mekong River of Vietnam. Journal of Coastal Research, (50), 268-272.

Nguyen, V. T., Zheng J. H., and Luong, P. H. 2011. Morphological evolution of navigation channel in Dinh An estuary, Vietnam. Proceedings of The 7th IAHR Symposium on River, Coastal and Estuarine Morphodynamics, 486-492. Beijing: Tsinghua University Press.

Nguyen, T. V. 2012. Morphological Evolution and Back Siltation of Navigation Channel in Dinh An Estuary, Mekong River Delta: Understanding, Modelling and Soluting. Ph. D. Dissertation. Nanjing: Hohai University.

Portcoast Consultant Corporation. 2006. Feasibility Project of Waterway for Heavy-Tonnages Ships to Enter the Hau River. Ho Chi Minh City: Portcoast Consultant Corporation. (in Vietnamese)

Portcoast Consultant Corporation, Nippon Koei Vietnam International LLC, and DHI Water and Environment. 2009. Modelling Report, Project of Waterway for Heavy-Tonnages Ships to Enter the Hau River. Hanoi: Project Management Unit of Waterway, Vietnam Ministry of Transport. (in Vietnamese)

Savenije, H. G. 2005. Salinity and Tides in Alluvial Estuaries. The Netherlands: Elsevier.

Shao, Y. Y., Yan, Y. X., and Maa, J. P. Y. 2011. In situ measurements of settling velocity near Baimao shoal in Changjiang Estuary. ASCE Journal of Hydraulic Engineering, 137(3), 372-380. [doi:10.1061/(ASCE) HY.1943-7900.0000312]

Thuy, N. N. 1989. Hydrodynamic Modeling of the Propagation of Tidal Waves in the River System of the Mekong Delta. Moscow: State Oceanographic Institute. (in Russian)

van Rijn, L. C. 2004. Estuarine and coastal sedimentation problems. International Journal of Sediment Research, 20(1), 39-51.

Warner, J. C., Schoellhamer, D. H., Burau, J. R., and Schladow, S. G. 2006. Flow convergence caused by a salinity minimum in a tidal channel. San Francisco Estuary and Watershed Science, 4(3), 91-102.

Wolanski, E., Nguyen, N. H., Le, T. D., Nguyen, H. N., and Nguyen, N. T. 1996. Fine-sediment dynamics in the Mekong River Estuary, Vietnam. Estuarine, Coastal and Shelf Science, 43(5), 565-582. [doi: org/10.1006/ecss.1996.0088].

Zhang, C., Zheng, J. H., Wang, Y. G., Zhang, M. T., Jeng, D. S., and Zhang, J. S. 2011. A process-based model for sediment transport under various wave and current conditions. International Journal of Sediment Research, 26(4), 498-512. [doi:10.1016/S1001-6279(12)60008-0]

Zhang, W., Wei, X. Y., Zheng, J. H., Zhu, Y. L., and Zhang, Y. J. 2012. Estimating suspended sediment loads in the Pearl River Delta region using sediment rating curves. Continental Shelf Research, 38, 35-46. [doi:10.1016/j.csr.2012.02.017]

Zheng, J. H., Yan, Y. X., and Zhu, Y. L. 2002. Three dimensional baroclinic numerical model for simulating fresh and salt water mixing in the Yangtze Estuary. China Ocean Engineering, 16(2), 227-238.

Zheng, J. H., Mase, H., Demirbilek, Z., and Lin, L. H. 2008. Implementation and evaluation of alternative wave breaking formulas in a coastal spectral wave model. Ocean Engineering, 35(11-12), 1090-1101. [doi:10.1016/j.oceaneng.2008.05.001]

Similar articles
1.Song Zhiyao1,2,3; Wu Tingting1,2; Xu Fumin2,3; Li Ruijie2,3.A simple formula for predicting settling velocity of sediment particles[J]. Water Science and Engineering, 2008,1(1): 37-43
2.Jing YIN, Zhi-li ZOU, Ping DONG, Hai-fei ZHANG, Guo-qiang WU, Yi-nan PAN.Experimental research on unstable movements of sandbars under wave actions[J]. Water Science and Engineering, 2012,5(2): 175-190
3.Jing ZHANG, Zhi-xue GUO, Shu-you CAO, Feng-guang YANG.Experimental study on scour and erosion of blocked dam[J]. Water Science and Engineering, 2012,5(2): 219-229

Copyright by Water Science and Engineering