The study attempts to decipher saline water invasion and aided geochemical influences activated along the coastal zones of Tamil Nadu and Puducherry. Total 76 groundwater samples representing pre- and post-monsoon seasons were collected and examined for various parameters like Ca²⁺, K⁺, Na⁺, Mg²⁺, Cl⁻, HCO₃⁻, NO₃⁻ and SO₄²⁻. Multiple techniques such as hydrochemical ionic changes, hydrochemical facies evolution model and seawater mixing index were incorporated to decipher the salinization process in the study area. Hydrochemical facies suggests 38.00% of groundwater samples representing CaHCO₃ facies indicating fresh groundwater, mixed Ca–Cl groundwater by 26.00% of samples and about 36.00% samples suggest Na–Cl indicating saline water. Hydrochemical facies evolution diagram differentiated groundwater facies into freshening and intrusion phase irrespective of seasons. About 23.60% and 21.00% of samples during pre- and post-monsoon suggest samples influenced by seawater intrusion. Hydrochemical ionic changes of samples signify the positive fraction of seawater in both seasons, which shows the mixing of fresh groundwater with saline water. The seawater mixing index confirms a greater percentage of samples during post-monsoon (42.00%) have been influenced by seawater with values greater than one. Principle component analysis extracted three factors with a total variance of 67.31% and 62.03% during pre- and post-monsoon seasons, respectively. Factor 1 replicates the natural processes such as saline water intrusion and ion exchange, whereas factors 2 and 3 signify anthropogenic actions such as improper sewage disposal, use of fertilizers, domestic and industrial waste discharge influencing groundwater chemistry.

这项研究试图破译咸水入侵，并协助泰米尔纳德邦和普杜切里沿岸地区激活的地球化学影响。收集总代表前和后季风季节76地下水样品，并检测各种参数如Ca ²⁺，K ⁺，钠⁺，镁²⁺，氯^-，HCO ₃ ^-，NO ₃ ^-和SO ₄ ^2-。结合水化学离子变化，水化学相演化模型和海水混合指数等多种技术来研究区域的盐化过程。水化学相表明，代表CaHCO的地下水样品占38.00％₃指示新鲜地下水的水相，Ca–Cl混合地下水的26.00％和约36.00％的样品表明NaCl指示为盐水。水化学相演化图将地下水相区分为淡季和入侵期，与季节无关。季风前后，大约有23.60％和21.00％的样品表明样品受到海水入侵的影响。样品中的水化学离子变化表示两个季节中海水的正含量，这表明新鲜的地下水与盐水​​混合。海水混合指数证实，季风后有较大比例的样品（42.00％）受到海水的影响，其值大于1。主成分分析提取了季风前后前后三个因素的总方差，分别为67.31％和62.03％，分别。因子1复制自然过程，例如盐水入侵和离子交换，而因子2和3表示人为行为，例如污水处理不当，肥料使用，影响地下水化学的生活和工业废水排放。