TAILIEUCHUNG - The equilibrium stages of headland-bay beaches in the coastal provinces of Vietnam

The study presents the application of parabolic model using MEPBAY package to estimate the equilibrium stages of the headland-bay beaches in Binh Thuan and Ninh Thuan provinces. The model results showed that the present shorelines in Phan Thiet, Binh Thuan are not under equilibrium stages. As for Binh Thuan, the shoreline changes with and without structures in Phan Thiet and Hon Rom beaches were predicte. | The equilibrium stages of headland-bay beaches in the coastal provinces of Vietnam Dang Van To1 Abstract The study presents the application of parabolic model using MEPBAY package to estimate the equilibrium stages of the headland-bay beaches in Binh Thuan and Ninh Thuan provinces. The model results showed that the present shorelines in Phan Thiet Binh Thuan are not under equilibrium stages. As for Binh Thuan the shoreline changes with and without structures in Phan Thiet and Hon Rom beaches were predicted. Phan Thiet beach is a dynamic equilibrium Hon Rom beach is a static equilibrium. As for Ninh Thuan Phan Rang beach is not an equilibrium beach. If the jetty in the downdrift of Phan Rang beach were constructed the beach would be stabilized. Key words Headland-bay beaches parabolic model MEPBAY Binh Thuan Ninh Thuan Vietnam. 1. Introduction Binh Thuan and Ninh Thuan formerly called Thuan Hai are two among many coastal provinces in the central southern Vietnam which are being developed rapidly for nonsmoking industries such as hotels and tourism. Binh Thuan is surrounded by Lam Dong and Ninh Thuan in the north East Sea Biển Đông in the east Dong Nai in the west and Vung Tau in the south Figure 1 . Comparatively the north and the south of Ninh Thuan are Phu Yen and Binh Thuan the west and the east of Ninh Thuan are Lam Dong and East Sea Figure 2 . The physical conditions of Binh Thuan and Ninh Thuan are relatively similar. They have two seasons high temperatures short and small rivers many large sand-dunes strong winds and long stretches of sandy beaches. Figure 1. Location of Binh Thuan Figure 2. Location of Ninh Thuan Binh Thuan has six main river mouths Long Huong Phan Ri Phu Hai Thuong Chanh Tan Hai and Lagi and many headlands La Gan Mui Nho Mui Rom Mui Ne Mui Ke Ga along 190km coastline. Binh Thuan has constructed many coastal works to develop the local fishery industry and ensure the navigation safety through the river mouths. Also these structures aim at .

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