Assessment of seawater impact using major hydrochemical ions: a case study from Sadras, Tamilnadu, India

Mondal, N. C.; Singh, V. S.; Saxena, V. K.; Singh, Vijay P.

doi:10.1007/s10661-010-1636-8

Cited by 44 publications

(13 citation statements)

References 45 publications

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“…Correlation matrix is generally used to understand the relationship between different ionic species [56]. The correlation matrix of Chaturangi glacier meltwater samples is demonstrated in Table 2.…”

Section: Correlation Matrix Of Measured Parametersmentioning

confidence: 99%

Hydrogeochemistry of Meltwater of the Chaturangi Glacier, Garhwal Himalaya, India

Singh

Ramanathan

Pottakkal

2014

Proc. Natl. Acad. Sci., India, Sect. A Phys. Sci.

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A hydrochemical analysis of meltwater draining from Chaturangi glacier was conducted to determine the dissolved ions chemistry and to evaluate the geochemical processes controlling major ions chemistry of the study area. Ca 2? , Mg 2? and SO 4 2-are the dominant ions in the glacier meltwater. The ratio of (Ca ? Mg) versus TZ ? varied from 0.79 to 0.86 with an average value of 0.82 ± 0.02 indicating larger contribution of Ca and Mg to the total cations. (Ca ? Mg)/(Na ? K) ratio is also high, varying from 3.77 to 6.33 with an average value of 4.77 ± 0.79. This shows the dominancy of carbonate weathering in the study area. The scatter diagram between (Ca ? Mg) versus SO 4 2-shows a linear trend throughout the range of data, indicating the dissolution of sulphate minerals as one of the possible source of SO 4 2-in the Chaturangi glacier meltwater. The C-ratio of meltwater of the study area shows that sulphide oxidation is the major proton producing mechanism. Correlation matrix and principal component analysis (factor analysis) were applied for identification of various processes controlling solute acquisition in the Chaturangi glacier meltwater.

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Section: Correlation Matrix Of Measured Parametersmentioning

confidence: 99%

Hydrogeochemistry of Meltwater of the Chaturangi Glacier, Garhwal Himalaya, India

Singh

Ramanathan

Pottakkal

2014

Proc. Natl. Acad. Sci., India, Sect. A Phys. Sci.

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“…values close to -1 and 1) implies strong relationships between the variables of one parameter and the other (Ratner 2009). Strong positive correlations are indicators of the significance of the parameter in the groundwater chemistry of the study area and their tendency to follow a similar trend (Adams et al 2001;Mondal et al 2011b). The correlation coefficients r for the various parameters tested are presented for the pre-monsoon, rainy and post-monsoon seasons and highlighted in Table 6.…”

Section: Correlation Matricesmentioning

confidence: 89%

“…It can be inferred that these parameters play significant roles in defining the groundwater geochemistry of the study area. Mondal et al (2011b) (Moujabber et al 2006), thereby implying the groundwater salinity may be due to the influence of the seawater body in proximity to the groundwater aquifer. Conversely, HCO 3 -and Ca 2?…”

Section: Correlation Matricesmentioning

confidence: 99%

Hydrogeochemical assessment of a coastal aquifer using statistical and geospatial techniques: case study of Mombasa North Coast, Kenya

Idowu¹,

Nyadawa

K’Orowe

2017

Environ Earth Sci

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The geochemistry of a coastal aquifer was assessed using statistical and geospatial analysis tools for the pre-monsoon, rainy and post-monsoon seasons. Data were obtained from both the field and laboratory analysis of water samples. Statistical methods such as correlation coefficients, piper plots, factor analysis and mixing index were used to gain insights into the geochemistry, while geospatial tools were used to create contours to understand the spatial distribution of the measured groundwater parameters of the coastal aquifer. The measured groundwater levels ranged from -0.84 to 30.08 m above mean sea level. The Electrical Conductivities and Total Dissolved Solids values were observed to have perfectly correlated with each other. Groundwater salinities were generally high, as over 94% of the water samples tested exceeded the WHO drinking water limit of 750 lS/cm and 500 mg/l, respectively. The groundwater pH was generally slightly alkaline but could be slightly acidic in the rainy season. The Na ? , K ? , Mg 2? , Cl -and SO 4 2-were observed to have high impacts on the geochemistry and also had tendencies to form similar trends. EC, TDS and NaCl values above 1000 mg/l in the groundwater were observed to generally skew towards the ocean during the rainy season. The principal process influencing the geochemistry was found to be seawater intrusion, while mineral dissolutions and rainwater percolation play lesser roles. The aquifer predominantly comprises Na-Cl waters of marine origin. The study shows the growing importance and applicability of integrated statistical and geospatial approaches for better understanding of groundwater and geochemistry of aquifers.

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“…The average mixing rate of freshwater and seawater during pre-monsoon is 24.2%, whereas it is 13.5% in post-monsoon. The ionic change values clearly display the hydrochemical process that takes place along the seawater and freshwater mixing zone in coastal aquifers (Mondal et al 2010a(Mondal et al , 2010b. The hydrochemistry of groundwater along such coastal aquifers is very much intricate to study and it varies with respect to space and time (Mondal et al 2010a Figs.…”

Section: Hydrochemical Facies Evolution For Identifying Seawater Intrmentioning

confidence: 99%

Hydrochemical Facies and Ionic Exchange in Coastal Aquifers of Puducherry Region, India: Implications for Seawater Intrusion

Sridharan

Nathan

2017

Earth Syst Environ

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Purpose Salinization of groundwater by seawater intrusion is a major concern for the coastal aquifers worldwide. Seawater intrusion occurs mainly due to overpumping of freshwater and sea-level rise which causes lateral and vertical movements of seawater into the coastal aquifers. Methods There are several methods to identify and assess the extent of seawater ingress towards land. In the present study, a hydrochemical approach is adopted to understand the status of intrusion. -/Br -ratio is used to distinguish the causes of salinity in groundwater. The Hydrochemical Facies Evolution diagram (HFE-diagram) and heat maps generated out of it have been very well used to understand evolution of seawater intrusion and freshening process in the coastal aquifer to time. The majority of samples in pre-monsoon fall under the facies Na-HCO 3 / SO 4 , followed by Na-mixHCO 3 /mix SO 4 , Mix Na-HCO 3 / Mix SO 4 , and MixNa-MixHCO 3 /mix SO 4 facies indicating direct cations exchange process, whereas, in post-monsoon, Na-Cl, Mix Na-Cl, and Mix Ca-Cl facies are dominant indicating reverse ion exchange process. In the study area, five locations, viz. Ariyankuppam, Kariambattur, Kalapet, Mutialpet, and Parikalpet, fall under Na-Cl and Ca-Cl facies in pre-and post-monsoon which indicates consistent seawater intrusion. The hydrochemical changes that take place during seawater freshwater interaction along coastal aquifer are determined by ionic exchange. Conclusion About 24.2% of samples in pre-monsoon and 13.5% of samples in post-monsoon show mixing of seawater. The highly negative ionic exchange values of sodium during pre-monsoon indicate increased amount of seawater fraction in groundwater.

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Assessment of seawater impact using major hydrochemical ions: a case study from Sadras, Tamilnadu, India

Cited by 44 publications

References 45 publications

Hydrogeochemistry of Meltwater of the Chaturangi Glacier, Garhwal Himalaya, India

Hydrogeochemistry of Meltwater of the Chaturangi Glacier, Garhwal Himalaya, India

Hydrogeochemical assessment of a coastal aquifer using statistical and geospatial techniques: case study of Mombasa North Coast, Kenya

Hydrochemical Facies and Ionic Exchange in Coastal Aquifers of Puducherry Region, India: Implications for Seawater Intrusion

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