Study on Salinity Intrusion in the Red River Delta

Abstract

Characteristics of salinity intrusion into the estuaries of the Red River System, Vietnam is studied based on many year measurement data of salinity concentration at stations along the estuaries and on a numerical model. Computed results of salinity concentration at measurement stations along rivers by the numerical model agree satisfactorily with the observation. It was found that in the dry season, the salinity intrusion length may be up to 20km for the main river and more than 20km for some tributaries. In the main river and tributaries with high freshwater discharge, the maximum salinity intrusion is observed in January while for the tributaries with low freshwater discharge, the maximum salinity intrusion is observed in March.