Geochemical Modeling of Groundwater in Chinnar River Basin: A Source Identification Perspective
Geochemical Modeling of Groundwater in Chinnar River Basin: A Source Identification Perspective
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DOI：
10.1016/j.aqpro.2015.02.124
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
C. Suma;K. Srinivasamoorthy;K. Saravanan;A. Faizalkhan;R. Prakash;S. Gopinath
中科院分区：
文献类型：
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作者：
C. Suma;K. Srinivasamoorthy;K. Saravanan;A. Faizalkhan;R. Prakash;S. Gopinath
了解地下水地球化学演化是地质系统性能评价和安全分析的重要组成部分。利用PHREEQCI的地球化学模拟技术将有助于确定控制地下水化学的主要因素和机制。在印度泰米尔纳德邦达尔马布里地区Chinnar盆地的硬岩地形上，对地下水水文地球化学的控制过程和因素进行了研究。该地区的岩石单元属于Charnockite和花岗质片麻岩。地下水化学已经尝试基于实验室观测的主要阳离子如Na+， K+， Ca2+和Mg2+和阴离子如Cl-， HCO3-, NO3-, F-， so42和PO43−。Piper图显示，沿补给区碳酸氢盐、钙和镁含量较高，沿流动路径呈下降趋势，钠、钾和氯化物等离子反之亦然。在两个主要岩性岩单元中，确定了两种基于piper和饱和度指数的流动路径。花岗岩地形表现为钙、硫酸盐矿物的沉淀和硅酸盐矿物的溶解。charnockite地形表现为硅酸盐的沉淀和钙、硫酸盐矿物的溶解。从初始溶液到最终溶液，钙和硫酸盐的稳定性略有变化，但由于研究区域岩石层中硅酸盐矿物的有效溶解，硅酸盐矿物的稳定性发生了巨大变化。
Understanding the geochemical evolution of groundwater is an essential part of the performance assessment and safety analysis of the geological system. Geochemical modeling techniques using PHREEQCI will aid in demarcating the main factors and mechanisms controlling the chemistry of groundwater. An attempt has been made in hard rock terrain of Chinnar basin, Dharmapuri district of Tamilnadu, India to interpret the processes and factors controlling hydrogeochemistry of groundwater. The area is made up of rock units belonging to Charnockite and Granitic Gneiss. Groundwater chemistry has been attempted based on laboratory observations of major cations like Na+, K+, Ca2+and Mg2+and anions like Cl-, HCO3-, NO3-, F-, SO42-and PO43−. Piper diagram reveals higher bicarbonate, calcium and magnesium along the recharge zones and tend to decrease along the flow path and vice versa for ions like sodium, potassium and chloride. Two flow paths based on piper and saturation index were identified for two major lithounits. The granitic terrain shows precipitation of calcium and sulfate minerals and dissolution of silicate minerals. The charnockite terrain shows precipitation of silicates and dissolution of calcium and sulfate minerals. From initial to final solution slight variation in calcium and sulfate stability were identified but drastic change with reference to silicate minerals stability due to effective dissolution of silicate minerals from the litho units of the study area.