Coastal Change in the Southern Song Hong Delta

Abstract

Analyzing landforms and sedimentary features, and the dominant factors affecting their formation, the lower Song Hong Delta is divided into natural levee and back swamp, delta, tidal flat, sand ridge complex. The dominant process in the coastal area is deposition and the shoreline has moved seaward at various rates in modern times, however, coastal erosion has recently been occurring in the south of the river mouth. The erosion rate has been 32.3 m/y at Hai Trieu for the last 20 years. The most intensive accretion occurred at Kim Son-Nga Son, where the average rate of accretion has been 60-80 m/y for the last 50 years.