Abstract
Each year, there have been many storms and strong monsoon waves that caused significant change of coastal morphology in the coastal zones of Vietnam. In the central of Vietnam, Nha Trang Coast also has a severe shoreline erosion problem, especially beach in the northern area of southern Nha Trang Bay disappears in several months every year. In this study, seasonal variation of morphology in this area is investigated. The detailed process of morphological change is presented based on analysis of fifteen-minute time-averaged images from northern and southern camera of video monitoring system. In addition, on the basis of the camera images analysis for surf zone characteristics, depth of closure is identified in consideration of different wave conditions between the northeast monsoon season and the non-monsoon season; hence the estimation of closure depth based on width of surf zone is also proposed in this analysis. Following that, longshore sediment transport rate for corresponded seasons is computed.
