Abstract
A study was carried in Mettur taluk, Salem district of Tamilnadu, India to develop a DRASTIC vulnerability index in GIS environment owing to groundwater pollution with increasing population, industries, and agricultural activities. Seven DRASTIC layers were created from available data (depth to water table, net recharge, aquifer media, soil media, topography, impact of vadose zone, and hydraulic conductivity) and incorporated into DRASTIC model to create a groundwater vulnerability map by overlaying the hydrogeological parameters. The output map indicates southwestern part of the study area with high pollution potential, northern and northwestern parts as moderate pollution potential and northeastern parts as low and no risk of pollution potential. For validating the vulnerability assessment, a total of 46 groundwater samples were collected from different vulnerability zones of the study area for two different seasons (pre- and post-monsoon) and analyzed for major anions and cations. Higher ionic concentrations were noted in wells located near highly industrialized, urbanized, and agricultural active zones. The water types represent Na–Mg–HCO3 and Na–Cl–HCO3 type indicating dominance of anthropogenic-related activities. Nitrate and chloride were demarcated as pollution indicators and correlated with DRASTIC vulnerability map. The results show that southwestern, northwestern, and northern parts of the study area recorded with high and moderate vulnerable zones, record higher nitrate values. In contrast to DRASTIC method predicted, low vulnerable zones show higher chloride concentration may be due to agricultural and urban development.
ملخص
دراسة كان يحمل داخل [متّور] [تلوك], سالم منطقة من [تميلندو], هند أن يطوّر صارمة جروحية فهرسة في [جس] بيرة بسبب ماء جوفيّ تلوث [ويث ينكرسنغ] السّكان, صناعات وأنشطة زراعيّة. خلقت سبعة طبقات صارمة كان من يتوفّر معطيات (عمق أن يروي طاولة, شبكة [رشرج], مستودع جوفيّ أوساط, تربة أوساط, طوبوغرافيّا, تأثير صدمة من [فدوس] منطقة وموصلية هيدروليّة) وأدمجت داخل نموذج صارمة أن يخلق ماء جوفيّ جروحية خريطة ب يطلي المعلمات جيولوجيّ مائيّ. الإنتاج يشير خريطة جزء جنوبيّة غربيّة من الدراسة منطقة مع عال تلوث إحتمال, شماليّة وجزء شماليّة غربيّة كمعتدلة تلوث إحتمال وأجزاء [نورث-سترن] كدنيا وما من خطر من تلوث إحتمال. ل يصدر الجروحية تقييم, جمعت مجموعة من 46 ماء جوفيّ عينات كان من مختلفة جروحية مناطق من الدراسة منطقة لاثنان فصول مختلفة ([بر] وعيّنت ريح موسميّة) وحلّلت لكبريات شاردات وكتيونات. لاحظت تركيزات [هيغر] أيونيّة كان في بئار حدّ قرب جدّا يصنع, مدّد ومناطق زراعيّة نشطة. الماء يمثّل أنواع [ن-مغ-هك]3 و [ن-كل-هك]3 طبعت يشير سيطرة من أنشطة [أنثروبوجنيك] متّصلة . حدّدت نترات وكلوريد كان كتلوث مؤشرات وارتبطت مع صارمة جروحية خريطة. يبدي النتيجات أنّ جنوبيّة غربيّة, شماليّة غربيّة و [نورثرن برت] من الدراسة منطقة يسجّل مع عال ومناطق معتدلة حصينة, سجل [هيغر] نترات قيم. في عقد إلى طريقة صارمة يتنبّأ, منخفضة حصينة مناطق عرض [هيغر] كلوريد تركيز يمكن كنت واجبة إلى زراعيّة
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Acknowledgments
The corresponding author acknowledges the financial support of the Department of Science and Technology, New Delhi, India under the Young scientist scheme grant number SR/FTP/ES-49/2006 dtd.13.08.2007. Thanks also to the anonymous reviewer for his constructive comments.
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Srinivasamoorthy, K., Vijayaraghavan, K., Vasanthavigar, M. et al. Assessment of groundwater vulnerability in Mettur region, Tamilnadu, India using drastic and GIS techniques. Arab J Geosci 4, 1215–1228 (2011). https://doi.org/10.1007/s12517-010-0138-x
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DOI: https://doi.org/10.1007/s12517-010-0138-x