Application of Solute Transport Modeling to Study Tsunami Induced Aquifer Salinity in India
Application of Solute Transport Modeling to Study Tsunami Induced Aquifer Salinity in India
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DOI：
10.3808/jei.201000164
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发表时间：
2010-03
影响因子：
7
通讯作者：
C. Sivakumar;L. Elango
中科院分区：
文献类型：
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作者：
C. Sivakumar;L. Elango
洪水、地震、海啸、海水入侵和岩水相互作用等自然过程都会导致地下水水质恶化。2004年12月26日，苏门答腊西海岸发生9.2级地震，引发大规模海啸，造成印度洋沿岸国家25万多人死亡，数千人流离失所。沿海地区的地下水污染不仅对生命财产造成了广泛的损害，而且使地下水水质恶化。研究海啸造成的地下水盐碱化过程以及自然补给过程冲洗这种盐碱化可能需要的时间具有重要意义。研究区域包括位于印度南部泰米尔纳德邦Kancheepuram区的Kalpakkam地区的一部分。建立了地下水模型，模拟了研究区地下水流和溶质浓度。有限元代码FEFLOW 5.2用于此目的。该模型被用来模拟地下水流动和溶质运移为两年，从2005年1月至2007年1月。结果表明，到2008-09年，该含水层系统中海啸引起的盐度将被正常的年降雨量冲走。审计后的结果也证实了该模型已被校准和模拟具有较高的准确性。目前的工作已经证明了地下水建模的应用，以了解海啸的地下水资源盐化的过程。它还有助于确定通过降雨补给对含水层系统进行补救所需的时间。
Natural processes such as flooding, earthquakes, tsunami, sea water intrusion and rock-water interaction processes will all result in deterioration of groundwater quality. One such natural catastrophic event, in the form of a massive tsunami occurred on December 26, 2004, triggered by a 9.2 magnitude earthquake off the west coast of Sumatra, killed more than 2,50,000 people and displaced thousands in countries around the Indian Ocean. Extensive damage is not only to the life and property but also for deterioration of groundwater quality in coastal regions. Study of processes of salinization of groundwater by tsunami and the time that it might take for the natural recharge processes to flush this salinity is of great importance. The study area includes a portion of Kalpakkam region situated in the Kancheepuram District of Tamil Nadu state in southern India. A groundwater model was developed to simulate the groundwater flow and solute concentration in the study area. Finite element code FEFLOW 5.2 was used for this purpose. The model was used to simulate groundwater flow and solute transport for a period of two years from January 2005 to January 2007. The results indicate that tsunami-induced salinity in this aquifer system would be flushed out with normal annual rainfall by the year 2008-09. The post audit results also confirms that the model have been calibrated and simulated with high accuracy. The present work has demonstrated the application of groundwater modeling to understand the process of salinisation of groundwater resources by tsunami. It has also helped to determine the time that it would take for remediation of the aquifer system by rainfall recharge.