Abstract
Beach has been eroded at the Cai River mouth flowing north of Nha Trang, resulting in disappearance of all sandy beaches on both sides of the river mouth. The satellite images taken between 2002 and 2015 and the storm event occurred in 2008 were analyzed together with the field observation in 2015 and 2016. Most important cause of the beach erosion was due to sand excavation from the sand bar on the right bank to obtain material for land reclamation on the left bank. Another factor of the erosion was the movement of sand in the upstream direction along the left bank. A measure for the restoration of sandy beach using training jetties was also shown on the basis of the example at the Dam Nai Bay entrance.
