PADDY SOIL SALINIZATION PROCESS IN TIEN HAI DISTRICT, THAI BINH PROVINCE UNDER SEA LEVEL RISE IMPACTS

Through different pathways, sea level rise will cause certain impacts on paddy soil salinization process in Tien Hai district, Thai Binh province. In which, irrigation water pathway is found to be a major factor increasing the salinization process there. Mike 11 is applied to predict the irrigation water salinity of Tien Hai district due to seawater intrusion in Red river under sea level rise impacts. From 2060, the irrigation water salinity will exceed 0.75ppt - the safety level for soil salinization risk. Proceeding with the salinity, it is the application of Saltmod for the paddy soil salinity trend prediction under sea level rise impacts through the irrigation pathway. The general salinity trend is predicted to increase from 2007 to 2100. In particular, the salinity of root zone and transition zone increases from 0.33% (2007) to 0.56% (2100) and from 0.36% (2007) to 0.84% (2100), respectively, while the aquifer salinity is nearly stable at 0.35%. Finally, the research shows that it is possible to apply Mike and Saltmod for the prediction of the soil salinization process of agricultural land in estuary areas under the sea level rise impacts of climate change in Vietnam.