Numerical study of sediment transport in Thu-Bon estuary and coastal areas of Hoi-An City

Abstract

The area of Cua-Dai estuary and the coastal areas of Hoi-An City have experienced complicated erosion and sedimentation in recent years. Along the coast of Hoi-An, erosion often occurs, whereas in the area of Cua-Dai River, there is an accretion phenomenon that obstructs the waterway navigation from Cua-Dai to Cu-Lao-Cham. Occurrence of sand dunes in the offshore location of Cua-Dai has been recorded at a number of times in recent years. Studying the process of bed morphological change due to the sediment transport in the Thu-Bon river and the influence of monsoons in the area allows to explain the above phenomenon thus an in-depth study to propose appropriate solutions. This study used the numerical model Telemac which combines the hydro-morphodynamic and wave modules. The simulation results show that the main trend of coastal currents caused by tides and waves tends to go southward, leading to coastal erosion especially in the northeast monsoon season as well as sedimentation in the estuarine area. In addition, the model also shows the crucial role of waves in shoreline erosion, with the degree of erosion in the north coast near Cua-Dai being more severe than the southern coast, through the formation of local eddy flow on the north coast.

Estimation of erosion- deposition trends across the Quang Nam coast in the background of the climate variability

“…Quang et al used the Digital Coastal Analysis System (DSAS) technique to statistically calculate the rate of change of the Quang Nam coastline from 1990 to 2019, showing that the Quang Nam coast was eroded and deposited over the past three decades and erosion is most severe in the north of Cua Dai, while shoreline evolution is recorded in the southern region [11]. In the authors used Telemac model combined with hydrodynamic and wave module to study Cua Dai area, showing the main trend of currents and waves towards the south, leading to erosion especially in the northeast monsoon season and deposited in the estuary [12].…”