Author(s): Nguyen Phuong Mai; Le Thi Hoa Binh; Do D. Hai; Sameh Kantoush; Sumi Tetsuya; And Thang D. Tang
Linked Author(s): Tetsuya Sumi
Keywords: Salinity in
Abstract: Vietnamese Mekong Delta (VMD) contributes to over 50% of the total rice, 70% of fruit and 74% of aquaculture productions for the entire country. In recent years, VMD has been facing severe freshwater shortages at the beginning of the dry season due to the significant impacts of salinity intrusion and climate change. A combination of field surveys and numerical modelling MIKE 1D, 3D to investigate salinity intrusion mechanisms to determine the timing of freshwater appearance during the dry season. The research findings that the peak salinity concentration (Smax) occurs at the bottom and appears after the maximum water level for a duration of 1 to 2 hours within one tidal cycle. While in the fortnight cycle, Smax occurs during the transition period from neap tide to spring tide. Furthermore, the mixing and stratification at the 60km river mouth area is highly complicated by partial mixing combined with stratified mixing. Therefore, during the dry season, freshwater still appears 30km from the river mouth area to serve agricultural and domestic demand. Simultaneously, the study identifies the salt wedge location to support aquaculture cultivation.
Year: 2024