Saline Intrusion due to the Accelerative Sea Level in the Red River System in Vietnam

摘要

Global climate change accelerates the sea level. Numerous investigations confirm that the indirect effect may be more significant than the direct effects by the rising sea level in this century; that is, it increases salinity of rivers and estuaries. The implications of sea level rise for increasing of salinity were examined for four estuary branches in the Red River System in North Vietnam using Savenije's salt-intrusion model, based on salinity data acquired in the dry season of 2006. By correlative analysis of river discharge, tidal range, and geometric characteristics, the changes of salt intrusion length and longitudinal salinity profile were estimated for three different sea levels: M.S.L.+30 cm, +75 cm, and +100 cm. It was found from the calculations that the saltwater intrusion extends 31-50% when the sea level is increased 100 cm by the year 2100. Most of the estuary branches are highly vulnerable to the sea level rise.