Gurumoorthy C, Sasidhar P, Arumugham V, Mathur R K
Safety Research Institute, Atomic Energy Regulatory Board, Kalpakkam, India.
Environ Monit Assess. 2004 Feb;91(1-3):211-22. doi: 10.1023/b:emas.0000009237.06427.2b.
Investigations on geohydrological aspects of coastal aquifer are important in order to understand the mechanism of ground water salinisation. The present study describes the salinity variations of ground water in deep boreholes drilled in Charnockite rock formation of Kalpakkam, on the eastern coast of India. Water samples collected up to 600m depth were analyzed for salinity variation. It is noticed that in one of the boreholes, (borehole K1), the salinity level is found to be 74 parts per thousand (ppt) at 400 m depth. Influence of surface saline water bodies viz., sea (26-28.5 ppt), backwaters (27-30 pt) and Buckingham canal (27-32 ppt) as the possible sources of recharge of fresh waters through joint and fracture system of the rock are discussed in this paper. Studies would assist in understanding the geohydrological characteristics of deep geological formation.
为了了解地下水盐渍化的机制，对沿海含水层的水文地质方面进行调查很重要。本研究描述了在印度东海岸卡尔帕卡姆角闪岩岩层中钻取的深钻孔中地下水的盐度变化。对采集的深度达600米的水样进行了盐度变化分析。注意到在其中一个钻孔（钻孔K1）中，在400米深度处盐度水平为千分之74（ppt）。本文讨论了地表咸水体，即海洋（26 - 28.5 ppt）、回水（27 - 30 pt）和白金汉运河（27 - 32 ppt）作为通过岩石的节理和裂隙系统补给淡水的可能来源的影响。这些研究将有助于了解深部地质构造的水文地质特征。
