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Assessment of geochemical processes occurring in groundwaters in the coastal alluvial aquifer

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Abstract

Groundwater samples are collected from 30 observation wells in the study area to analyze the hydrochemical quality for determining the seawater encroachment in the part of Central Godavari Delta, Bay of Bengal, India. In order to establish the baseline hydrochemical conditions and processes determining the groundwater quality, an integrated investigation coupled with multivariate statistical analysis and hydrochemical methods are used to identify and interpret the groundwater chemistry of the aquifer system. The major land use is irrigated agriculture and aquaculture in the study area. The ground waters affected by the seawater intrusion featured high levels of sodium (Na+), chloride (Ca+), and TDS, which are the simplest common indicators for seawater influence. The elevated levels of NO3–N at some monitoring wells indicate nitrate pollution of groundwater due to anthropogenic origin such as septic effluents or chemical fertilizers. Besides the major chemical compositions, it was also demonstrated that ionic ratios would be useful to delineate seawater intrusion and they include Na+/Ca2+, Mg2+/Ca2+, SO4 2−/Ca2+, Na+/(Na+ + Cl−), and Ca−/sum of anions. This paper demonstrates the variations in hydrochemical quality of groundwater and its evolution processes in two different seasons in the coastal aquifer alluvial settings

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Acknowledgment

Authors are grateful to the director of N.G.R.I., Hyderabad, for his continuous encouragement and kind permission to publish this paper.

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Authors and Affiliations

  1. National Geophysical Research Institute, Council of Scientific and Industrial Research, Uppal Road, Hyderabad, 500007, India

    V. V. S. Gurunadha Rao, G. Tamma Rao, L. Surinaidu, J. Mahesh, S. T. Mallikharjuna Rao & B. Mangaraja Rao

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  1. V. V. S. Gurunadha Rao
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  2. G. Tamma Rao
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  3. L. Surinaidu
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  4. J. Mahesh
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  5. S. T. Mallikharjuna Rao
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  6. B. Mangaraja Rao
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Correspondence to G. Tamma Rao.

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Gurunadha Rao, V.V.S., Tamma Rao, G., Surinaidu, L. et al. Assessment of geochemical processes occurring in groundwaters in the coastal alluvial aquifer. Environ Monit Assess 185, 8259–8272 (2013). https://doi.org/10.1007/s10661-013-3171-x

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  • DOI: https://doi.org/10.1007/s10661-013-3171-x

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