Sand dunes Groundwater Quality in the context of Climate Change: A Case Study of Phao Dai Hamlet, Tien Giang, Vietnam

Abstract

Abstract Climate change is currently the main cause for deteriorating freshwater sources worldwide. It has raised sea levels and fluctuated rainfall over the years, causing salinity intrusion among coastal areas. Therefore, sand dunes, one of the primary freshwater sources formed by depositing alluvium at higher sea level altitudes, have been affected by climate change. This study focused on the impact of climate conditions on the freshwater supply in these potential areas. Fifteen groundwater samples from 06 dug wells in Phao Dao hamlet, Tien Giang province, Vietnam, were collected monthly from August 2016 to March 2017 to be analyzed at the Institute of Coastal and Offshore Engineering (ICOE). The results showed that most of the nutrient-related analyzed parameters were within the thresholds of QCVN 09 – MT: 2015/BTNMT for groundwater use and QCVN 01:2009/ BYT for drinking water quality, but not salinity-related parameters. In addition, salinity, CaCO3, and TDS unpredictably fluctuated depending on the seasons and lowered from the coastal to inland areas.