Some research results on erosion and deposition in the coastal zone of Haiphong

Abstract

     Haiphong is a major industrial and port city in Vietnam. It plays an important role in the coastal shipping routes in the northern part of Vietnam. In recent years, the deposition and erosion of the coastal zone of Haiphong has increased in terms of intensity and scale, which has seriously influenced the social-economic activities of the area. Of Haiphong's 125 km coastline, approximately 16.1 km is being eroded (about 23.0%). The erosion occurs at Dinh Vu Island, the southern part of Bai Nha Mac, alongside of the road No14, Cat Hai Island and Phu Long area at a rate of 1.2 to 9.6 m/year (averaging 5.4 m/year). The deposition in the coastal zone of Haiphong occurs in a complicated manner also, especially in the Cam River. Annually, the amount of dredging of the river bed is about 2.5 to 2.9 million tonnes. In addition, southwest of the Doson Peninsula is strongly affected by the deposition phenomenon. This leads to a difficulty in construction of the deep-sea port in the area