Establishing the Vertical Movement Map of Cuu Long Delta River by GNSS Data

Abstract

Mekong Delta is an area with an important position in the socio-economic development of Vietnam. However, due to the impact of
climate change as well as of the construction of hydroelectric dams in the upstream of the Mekong River in recent years, saline intrusion
and flooding have been occurred because of high tide. According to published researches, the Mekong Delta is being experienced surface
subsidence with a rate of up to centimeters per year, that exacerbates the impact of saline intrusion and flooding. Thus, studying to
establish the surface subsidence map is an urgent need in this site. There are many of technologies to create the vertical movement map
such as: Levelling, INSAR, GNSS, etc. Up to now, there are no scientific reports on the application of GNSS to monitor the vertical
movement in this area. In this paper, the authors have calculated the largest vertical displacement velocity up to 3cm/year based on
processing GNSS observations of nearly 20 GNSS monitoring station in the area using Bernese software. From these results, the research
team has made the vertical movement map of Mekong, Vietnam.