The Mekong River discharges into the Vietnamese East Sea and forms a subaqueous deposit known as a clinoform, the region of greatest sediment accumulation for the deltaic system. The peak discharge from the Mekong River is linked to seasonal monsoon conditions and occurs from August to November when ocean conditions are relatively quiescent. The river plume carries sediment to the clinoform where it is deposited. Subsequently (January to April), the coupling of energetic surface waves, tidal currents, and wind-driven currents resuspends much of the newly deposited shelf sediment and transports it landward and southwestward. This pathway displaces about two-thirds of the sediment to nourish distal coastal regions along the Ca Mau Peninsula. Throughout the year, the seaward flow of the Mekong surface plume causes estuarine circulation to draw much underlying ocean water landward onto the shelf (more than twice the volume of Mekong freshwater discharge). This process allows dissolved chemical components to become attached (i.e., adsorbed) to surfaces of suspended particles. The sediment accumulating on the seabed buries a broad array of these components from sources in the adjacent ocean water as well as the river drainage basin. The ocean portion of the Mekong River dispersal system involves an intricate coupling of temporally variable processes (e.g., river discharge, coastal winds, and along-shelf currents). Future alterations to the river source (e.g., due to damming) and to the ocean sink (e.g., due to climate change) will likely affect this coupling and modify the processes occurring on the Mekong continental shelf.

Nittrouer, C.A., D.J. DeMaster, E.F. Eidam, T.T. Nguyen, J.P. Liu, A.S. Ogston, and P.V. Phung. 2017. The Mekong continental shelf: The primary sink for deltaic sediment particles and their passengers. Oceanography 30(3):60–70, https://doi.org/10.5670/oceanog.2017.314.

Allison, M.A., C.A. Nittrouer, A.S. Ogston, J.C. Mullarney, and T.T. Nguyen. 2017. Sedimentation and survival of the Mekong Delta: A case study of decreased sediment supply and accelerating rates of relative sea level rise. Oceanography 30(3):98–109, https://doi.org/​10.5670/oceanog.2017.318.

Allison, M.A., H.D. Weathers III, and E.A. Meselhe. In press. Bottom morphology in the Song Hau distributary channel, Mekong River Delta, Vietnam. Continental Shelf Research, https://doi.org/10.1016/​j.csr.2017.05.010.

Anthony, E.J., G. Brunier, M. Besset, M. Goichot, P. Dussouillez, and V.L. Nguyen. 2015. Linking rapid erosion of the Mekong river delta to human activities. Science Report 5:1–12, https://doi.org/10.1038/srep14745.

Darby, S.E., C.R. Hackney, J. Leyland, M. Kummu, H. Lauri, D.R. Parsons, J.L. Best, A.P. Nicholas, and R. Aalto. 2016. Fluvial sediment supply to a mega-delta reduced by shifting tropical-cyclone activity. Nature 539:276–279, https://doi.org/10.1038/nature19809.

DeMaster, D.J., J.P. Liu, E. Eidam, C.A. Nittouer, and T.T. Nguyen. In press. Determining rates of sediment accumulation on the Mekong shelf: Timescales, steady-state assumptions, and radiochemical tracers. Continental Shelf Research, https://doi.org/10.1016/j.csr.2017.06.011.

DeMaster, D.J., and R.H. Pope. 1996. Nutrient dynamics in Amazon shelf waters: Results from AmasSeds. Continental Shelf Research 16:263–289, https://doi.org/​10.1016/0278-4343(95)00008-O.

Eidam, E.F., C.A. Nittrouer, A.S. Ogston, D.J. DeMaster, J.P. Liu, T.T. Nguyen, T.N. Nguyen. In press. Dynamic controls on shallow clinoform geometry: Mekong Delta, Vietnam. Continental Shelf Research, https://doi.org/10.1016/j.csr.2017.06.001.

Fagherazzi, S., K.R. Bryan, and W. Nardin. 2017. Buried alive or washed away: The challenging life of mangroves in the Mekong Delta. Oceanography 30(3):48–59, https://doi.org/​10.5670/oceanog.2017.313.

Fricke, A.T., C.A. Nittrouer, A.S. Ogston, and H.P. Vo-Luong. In press. Asymmetric progradation of a coastal mangrove forest controlled by combined fluvial and marine influence, Cù Lao Dung, Vietnam. Continental Shelf Research, https://doi.org/​10.1016/j.csr.2017.07.012.

Kineke, G.C., R.W. Sternberg, J.H. Trowbridge, and W.R. Geyer. 1996. Fluid-mud processes on the Amazon continental shelf. Continental Shelf Research 16:667–696, https://doi.org/​10.1016/0278-4343(95)00050-X.

Koide, M., A. Soutar, and E.D. Goldberg. 1972. Marine geochronology with ²¹⁰Pb. Earth and Planetary Science Letters 14:442–446, https://doi.org/​10.1016/0012-821X(72)90146-X.

Kuehl, S.A., D.J. DeMaster, and C.A. Nittrouer. 1986. Nature of sediment accumulation on the Amazon continental shelf. Continental Shelf Research 6:209–225, https://doi.org/​10.1016/0278-4343(86)90061-0.

Liu, J.P., D.J. DeMaster, T.T. Nguyen, Y. Saito, V.L. Nguyen, T.K.O. Ta, and X. Li. 2017. Stratigraphic formation of the Mekong River Delta and its recent shoreline changes. Oceanography 30(3):72–83, https://doi.org/10.5670/oceanog.2017.316.

Liu, J.P., D.J. DeMaster, C.A. Nittrouer, E.F. Eidam, and T.T. Nguyen. In press. A seismic study of the Mekong subaqueous delta: Proximal versus distal accumulation. Continental Shelf Research, https://doi.org/10.1016/j.csr.2017.07.009.

Liu, Z., H. Yang, and Q. Liu. 2001. Regional dynamics of seasonal variability in the South China Sea. Journal of Physical Oceanography 31:272–284, https://doi.org/10.1175/1520-0485(2001)031<0272:​RDOSVI>2.0.CO;2.

Loisel, H., A. Mangin, V. Vantrepotte, D. Dessailly, D. Ngoc Dinh, P. Garnesson, S. Ouillon, J.P. Lefebvre, X. Mériaux, and T. Minh Phan. 2014. Variability of suspended particulate matter concentration in coastal waters under the Mekong’s influence from ocean color (MERIS) remote sensing over the last decade. Remote Sensing of Environment 150:218–230.

Martin, D.P., C.A. Nittrouer, A.S. Ogston, and J.S. Crockett. 2008. Tidal and seasonal dynamics of a muddy inner shelf environment, Gulf of Papua. Journal of Geophysical Research 113:1–18, https://doi.org/10.1029/2006JF000681.

McLachlan, R.L., A.S. Ogston, and M.A. Allison. In press. Implications of tidally-varying bed stress and intermittent estuarine stratification on fine-​sediment dynamics through the Mekong’s tidal river to estuarine reach. Continental Shelf Research, https://doi.org/10.1016/j.csr.2017.07.014.

Meselhe, E., D. Roelvink, C. Wackerman, F. Xing, and V.Q. Thanh. 2017. Modeling the process response of coastal and deltaic systems to human and global changes: Focus on the Mekong system. Oceanography 30(3):84–97, https://doi.org/​10.5670/oceanog.2017.317.

Milliman, J.D., and K.L. Farnsworth. 2011. River Discharge to the Coastal Ocean: A Global Synthesis. Cambridge University Press, Cambridge, 392 pp.

Minderhoud, P.S.J., G. Erkens, V.H. Pham, V.T. Bui, L. Erban, H. Kooi, and E. Stouthamer. 2017. Impacts of 25 years of groundwater extraction on subsidence in the Mekong Delta, Vietnam. Environmental Research Letters 12:064006, https://doi.org/10.1088/1748-9326/aa7146

Mullarney, J.C., S.M. Henderson, B.K. Norris, K.R. Bryan, A.T. Fricke, D.R. Sandwell, and D.P. Culling. 2017. A question of scale: How turbulence around aerial roots shapes the seabed morphology in mangrove forests of the Mekong Delta. Oceanography 30(3):34–47, https://doi.org/​10.5670/oceanog.​2017.312.

Nguyen, A.D., H.H. Savenije, D.N. Pham, and D.T. Tang. 2008. Using salt intrusion measurements to determine the freshwater discharge distribution over the branches of a multi-channel estuary: The Mekong Delta case. Estuarine, Coastal and Shelf Science 77:433–445, https://doi.org/10.1016/​j.ecss.2007.10.010.

Nguyen, V.L., T.K.O. Ta, and M. Tateishi. 2000. Late Holocene depositional environments and coastal evolution of the Mekong River Delta, southern Vietnam. Journal of Asian Earth Sciences 18:427–439, https://doi.org/10.1016/S1367-9120(99)00076-0.

Nittrouer, C.A., G.J. Brunskill, and A.G. Figueiredo. 1995. The importance of tropical coastal environments. Geo-Marine Letters 15:121–126, https://doi.org/10.1007/BF01204452.

Nittrouer, C.A., D.J. DeMaster, S.A. Kuehl, and R.O. Kowsmann. 1986. The deltaic nature of Amazon shelf sedimentation. Geological Society of America Bulletin 97:444–458, https://doi.org/10.1130/0016-7606(1986)97​<444:TDNOAS>2.0.CO;2.

Nittrouer, C.A., D.J. DeMaster, and B.A. McKee. 1984. Fine-scale stratigraphy in proximal and distal deposits of sediment dispersal systems in the East China Sea. Marine Geology 61:13–24, https://doi.org/10.1016/0025-3227(84)90105-1.

Nittrouer, C.A., R.W. Sternberg, R. Carpenter, and J.T. Bennett. 1979. The use of Pb-210 geochronology as a sedimentological tool: Application to the Washington continental shelf. Marine Geology 31:297–316, https://doi.org/​10.1016/0025-3227(79)90039-2.

Nowacki, D.J., A.S. Ogston, C.A. Nittrouer, A.T. Fricke, and P.D.T. Van. 2015. Sediment dynamics in the lower Mekong River: Transition from tidal river to estuary. Journal of Geophysical Research 120:6,363–6,383, https://doi.org/​10.1002/2015JC010754.

Ogston, A.S., M.A. Allison, R.L. McLachlan, D.J. Nowacki, and J.D. Stephens. 2017. How tidal processes impact the transfer of sediment from source to sink: Mekong River collaborative studies. Oceanography 30(3):22–33, https://doi.org/​10.5670/oceanog.2017.311.

Schmitt, R.J.P., Z. Rubin, and G.M. Kondolf. In press. Losing ground: Scenarios of land loss as consequence of shifting sediment budgets in the Mekong Delta. Geomorphology, https://doi.org/​10.1016/j.geomorph.2017.04.029.

Syvitski, J.P.M., A.J. Kettner, I. Overeem, E.W.H. Hutton, M.T. Hannon, G.R. Brakenridge, J. Day, C. Vorosmarty, Y. Saito, L. Giosan, and R.J. Nicholls. 2009. Sinking deltas due to human activities. Nature Geoscience 2:681–686, https://doi.org/10.1038/NGEO629.

Tamura, T., Y. Saito, S. Sieng, B. Ben, M. Kong, I. Sim, S. Choup, and F. Akiba. 2009. Initiation of the Mekong River delta at 8 ka: Evidence from the sedimentary succession in the Cambodian lowland. Quaternary Science Reviews 28:327–344, https://doi.org/10.1016/j.quascirev.2008.10.010.

Thanh, V.Q., J. Reyns, C. Wackerman, E.F. Eidam, and D. Roelvink. In press. Modelling suspended sediment dynamics on the subaqueous delta of the Mekong River. Continental Shelf Research, https://doi.org/10.1016/j.csr.2017.07.013.

Unverricht, D., T.C. Nguyen, C. Heinrich, W. Szczuciński, N. Lahajnar, and K. Stattegger. 2014. Suspended sediment dynamics during the inter-monsoon season in the subaqueous Mekong Delta and adjacent shelf, southern Vietnam. Journal of Asian Earth Sciences 79:509–519, https://doi.org/10.1016/j.jseaes.2012.10.008.

Unverricht, D., W. Szczuciński, K. Stattegger, R. Jagodziński, X.T. Le, and L.L.W. Kwong. 2013. Modern sedimentation and morphology of the subaqueous Mekong Delta, southern Vietnam. Global Planetary Change 110:223–235, https://doi.org/​10.1016/j.gloplacha.2012.12.009.

Wackerman, C., A. Hayden, and J. Jonik. In press. Deriving spatial and temporal context for point measurements of suspended sediment concentration using remote sensing imagery in the Mekong Delta. Continental Shelf Research.

Walsh, J.P., C.A. Nittrouer, C.M. Palinkas, A.S. Ogston, R.W. Sternberg, and G.J. Brunskill. 2004. Clinoform mechanics in the Gulf of Papua, New Guinea. Continental Shelf Research 24:2,487–2,510, https://doi.org/10.1016/j.csr.2004.07.019.

Wolanski, E., N. Ngoc Huan, L. Trong Dao, N. Huu Nhan, and N. Ngoc Thuy. 1996. Fine-sediment dynamics in the Mekong River estuary, Vietnam. Estuarine and Coastal Shelf Sciences 43:565–582, https://doi.org/10.1006/ecss.1996.0088.

Xue, Z., J.P. Liu, D.J. DeMaster, L. Van Nguyen, and T.K.O. Ta. 2010. Late Holocene evolution of the Mekong subaqueous delta, southern Vietnam. Marine Geology 269:46–60, https://doi.org/​10.1016/j.margeo.2009.12.005.

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