Impacting of the works on the big estuarine about salinity intrusion in the river system at the Mekong Delta

Abstract

      The Mekong River Delta (MRD) located in the lower Mekong River, the topography is low (0.8 to 1.2 m), dense canal system. Hydrological regime is extremely complex, influenced by East sea tide, West sea tide, the upstream mining, the rain regime, exploitation at Delta, the northeast wind and sea level rise. According to the Ministry of Natural Resources and Environment, 2050, average sea level could rise 30cm, so salinity in the Delta will penetrate deep into the interior region.
      Solutions for the future of the Mekong Delta is to build sea dike and big sluice on the mouths of the Mekong River to will lead to changes flow regime and salinity intrusion in the Mekong Delta. The use of 1-2D computer model to calculate hydrolorical regime and salinity intrusion in the river system and sea. The results show that: (i) The model is capable of simulating good hydrolory regime and salinity intrusion in the Mekong Delta; (ii) Under the impact of sea level rise by 30cm (2050), the construction of big sluice on the mouths of Mekong river, the salinity changes only on the Vam Co river about 38km, 25 km Hau river, 20km Ham Luong river, 25 km Tien River from estuary. The salinity concentration in Can Tho station (Hau River) and My Thuan station (Tien river) virtually unchanged; and (iii) salinity varies from 17-33 g/l at 9 river mouths, depend on the

river mouth.