Aquifers 1 CatBoost Regression 1 Catboost regression Decision trees 1 Forecasting 1 Groundwater resources 1 Groundwater salinities 1 Groundwater salinization 1 Groundwater salinizations 1 Hydraulic conductivity 1 Hydrogeology 1 Influencing factor 1 Influencing factors 1 Machine learning 1 Machine learning algorithms 1 Mean square error 1 Mekong Delta 1 Mekong River 1 Multi-layer coastal aquifer 1 Multi-layer coastal aquifers 1 Multi-layers 1 Regression analysis 1 Root mean square errors 1 Salt water intrusion 1 Viet Nam 1 Water management 1 algorithm 1 coastal aquifer 1 detection method 1 hydraulic conductivity 1