Chien, N.Q. and Tung, T.T., 2018. Recent sedimentation of a mesotidal wave-dominated river mouth: Lach Van, Vietnam. In: Almar, R.; Almeida, L.P.; Viet, N.T., and Sall, M. (eds.), Tropical Coastal and Estuarine Dynamics. Journal of Coastal Research, Special Issue No. 81, pp. 50–56. Coconut Creek (Florida), ISSN 0749-0208
The sedimentation of a wave-dominated river mouth in Tonkin Gulf, Vietnam, has been investigated for the time period 2005–2017. Deepwater wave statistics and the potential longshore sediment transport (LST) has been determined, which shows a net LST rate of ~105 m3/yr southward. A one-line model is used to estimate the change in local coastline; the model is verified against shoreline position data obtained from satellite images. It is apparent that the accretion occurs on both sides of the river mouth with a rate of ~10 m/yr. Coastline evolution trend is then predicted for the aforementioned time period, and results show evidences that accretion is intensifying in recent years, which is most probably due to slight variation in local wave climate. Results of this study can be used as a scientific basis to propose solutions for stabilizing the river mouth entrance and its channel.
