Sediment transport and coastal evolution at Thuan An Inlet, Vietnam / Sedimenttransport och kustutveckling vid Thuan An-inloppet, Vietnam
The Tam Giang-Cau Hai lagoon in Vietnam has two inlets and outside one of them, the Thuan An inlet, a groin was constructed in 2008 to reduce sediment transport and prevent the inlet from closing. This groin has caused erosion and accretion of sediment on the adjacent coastline. The objectives of this study were to make a model of the sediment transport on the southeast side of the groin and analyze how different measures to reduce the erosion of the inlet would affect the sediment transport past the groin. Field measurements were made in Vietnam during 2013, other data used in this study was obtained from Institute of Mechanics in Hanoi, University of Agriculture and Forestry in Hue and from The Oceanographic Institute in Nha Trang. The modeling software GENESIS was used to model the sediment transport past the groin. First, the case where no measures were taken was modeled and after that three different measures to decrease the accretion of sediment on the southeast side of the groin were modeled and analyzed. The conclusion was that interventions to reduce the erosion of the inlet are needed to protect the lagoon and the people living around it and making their livelihood from it.