Hydrogeochemical assessment and suitability of groundwater in a typical Mediterranean coastal area: A case study of the Marathon basin, NE Attica, Greece

Papazotos, Panagiotis; Koumantakis, I.; Vasileiou, Eleni

doi:10.1016/j.hydres.2019.11.002

Cited by 34 publications

(16 citation statements)

References 44 publications

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“…The groundwater samples in the study area indicate enrichment of Ca 2+ + Mg 2+ compared to HCO 3 − , these points are more to the right below the 1:1line indicting that reverse ion-exchange processes dominate in the area (Fig. 11) and that this occurs due to the weathering of carbonate minerals in the presence of clays with exchangeable Ca 2+ (Papazotos et al 2019).…”

Section: Bivariate Plotsmentioning

confidence: 90%

Investigation of groundwater salinity using geophysical and geochemical approaches: heuningnes catchment coastal aquifer. Western Cape Province, South Africa

2021

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Seawater intrusion is recognised as a major factor affecting the quality of groundwater in coastal aquifers around the world. To determine the occurrence and extent of saline groundwater intrusion prevailing in the Heuningnes Catchment, a 2D resistivity imaging survey was carried out in three sites within the catchment. Eleven resistivity profile lines were conducted using the multi-electrode ABEM SAS resistivity meter system, employing the Wenner Array to map the extent of saline groundwater. A 2D resistivity image was acquired for these resistivity profile lines and the data were processed using Res2DINV software to produce the 2D inverse resistivity models. The interpretation of the resistivity models revealed three resistivity zones. The first zone is characterised by low resistivity (1-3 Ω.m); this represents an aquifer filled with saline water. The second resistivity zone has values ranging from (3-30 Ω.m); this represents a brackish saturated formation. The third resistivity zone denotes a sandy layer/sandstone saturated with freshwater having high resistivity values above 30 Ω.m. Geochemical analysis results of water samples at 11 locations along the electrical resistivity profile lines also suggest high salinity, indicated by high levels of Cl − , Na + , Total Dissolved Solids, and Electrical Conductivity. It is concluded that some parts of the study area are impacted by seawater intrusion, based on the lower resistivity of < 3 Ω.m and ionic ratios which were close to the standard seawater ratios for Na + /Cl − and SO 4 2− /Cl − . In addition, the high ionic ratios of Na + /Cl − and SO 4 2− /Cl − suggest that salinity in the area is a result of dissolution of evaporates and dilution of marine clays rich in sodium. Therefore, salinization in the study area is the result of combined processes. Integration approach proved to be significant in mapping saline groundwater in coastal aquifers. Integrated assessment of resistivity data, ionic analysis and chemical interpretation indicate that the study area is a transition zone from freshwater to saltwater and only few locations are actually impacted by seawater intrusion. The overall groundwater quality is not apt for human ingestion.

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Section: Bivariate Plotsmentioning

confidence: 90%

Investigation of groundwater salinity using geophysical and geochemical approaches: heuningnes catchment coastal aquifer. Western Cape Province, South Africa

2021

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“…Sodium percent (Na%) is considered an important parameter for the assessment of groundwater suitability for irrigation water, as sodium decreases the soil fertility [19]. Equation (6) was used to calculate Na% [10]:…”

Section: Sodium Percentage (Na%)mentioning

confidence: 99%

“…NaAlSi3O8+8H2O → Na + +Al(OH)4 − +3H4SiO4 (10) Water 2020, 12, x FOR PEER REVIEW 12 of 17 Figure 6. Ratio graphs of ions in groundwater samples collected from the Jinta Basin, China.…”

Section: The Major Weathering and Hydrogeochemical Processes Affectinmentioning

confidence: 99%

“…The studies mentioned above have not evaluated the groundwater quality of the Jinta Basin, which is of value for guiding the development and utilization of groundwater in the basin. The water quality index (WQI) has been widely used in recent years for the characterization of groundwater quality [10]. For example, Papazotoset et al [11] use the WQI to examine the suitability of groundwater in the Marathon Basin, northeast Attica, Greece, for drinking water and irrigation.…”

Section: Introductionmentioning

confidence: 99%

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Quality Assessments of Shallow Groundwaters for Drinking and Irrigation Purposes: Insights from a Case Study (Jinta Basin, Heihe Drainage Area, Northwest China)

Feng

Sun

et al. 2020

Water

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This study aimed to determine the hydrochemical characteristics and hydrogeochemical processes of shallow groundwater in the Jinta Basin, northwest China, and to evaluate the suitability of groundwater quality for drinking water and agricultural irrigation. A systematic hydrogeological survey was conducted in the study area from May 2017 to October 2018, during which 123 representative samples of groundwater were selected for analysis of chemical parameters and determination of the water quality index. The results showed that the pH of groundwater in the study area was weakly alkaline and ranged between 7.21–8.93. Dominant cations were Mg2+ and Na+ and the dominant anion was SO42−. Along the groundwater flow from the southwest to northeast, the dominant groundwater chemistry type in the recharge area was Mg-HCO3·SO4. After the transition of the groundwater types in the runoff area to Mg-SO4·HCO3 and Mg·Na-SO4, the groundwater type in the discharge area evolved into Na·Mg-SO4·Cl. The major factors driving the evolution of groundwater chemical types in the Jinta Basin were found to be rock weathering, evaporation and precipitation. The chemical components of groundwater mainly originated from the dissolution of silicate rock and evaporative concentration of salt under water-rock interaction, whereas the dissolution of carbonate had little influence. The quality of drinking water was divided into five groups, and 39.84% of samples fell within the high and good quality groups. The quality of agricultural irrigation water was divided into different grades according to different methods.

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“…The plot of Ca + Mg vs. HCO 3 + SO 4 ( Figure 5 ) is a major indicator of ion-exchange processes ( Cerling et al., 1989 ; Fisher and Mullican, 1997 ; Papazotos et al., 2019 ). Samples along the 1:1 equiline reveal dissolution of gypsum, calcite and dolomite.…”

Section: Introductionmentioning

confidence: 99%

Preliminary geochemical characterization of saline formation water from Miocene reservoirs, offshore Niger Delta

Bolaji

Oti

Onyekonwu

et al. 2021

Heliyon

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The Niger Delta is one of the most prolific hydrocarbon provinces in the world, but information on basinal hydrogeology is scanty. Oilfield brines from nine producer wells in the Miocene reservoirs (2,472.25–3,532.48 m.b.s.l.), offshore Niger Delta, have been investigated along with two seawater samples to understand their hydrogeochemical characteristics in relation to the host rock mineralogy. Chemical analysis revealed that the waters are slightly alkaline and can be generally classified as saline water of the Na–Cl type based on their total dissolved solids (TDS). On the basis of bicarbonate, chloride, and sulphate ions, they are shown to be of connate origin. Relative abundance of major ions is in the following order: Na > Ca > Mg > K and Cl > HCO 3 > SO 4 . Saturation indices (SI) of selected mineral phases calculated using PHREEQC indicate that the dissolution of iron oxide and carbonate minerals may contribute major ions in the formation water. The preponderance of alkali elements suggests the presence of feldspars, which could have resulted from sediments through which the water flows. An inverse relationship is observed between the resistivity of formation water and its TDS, which could be used to calculate resistivity values of formation waters in the area if the TDS contributions are known. Chemical data suggest that the formation waters were derived from seawater, dominantly altered by reverse ion-exchange processes and subsequently by water-rock interactions. Multivariate statistical analyses (correlation and factor analysis) indicate multiple sources of enrichment of ions in the formation waters.

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Hydrogeochemical assessment and suitability of groundwater in a typical Mediterranean coastal area: A case study of the Marathon basin, NE Attica, Greece

Cited by 34 publications

References 44 publications

Investigation of groundwater salinity using geophysical and geochemical approaches: heuningnes catchment coastal aquifer. Western Cape Province, South Africa

Investigation of groundwater salinity using geophysical and geochemical approaches: heuningnes catchment coastal aquifer. Western Cape Province, South Africa

Quality Assessments of Shallow Groundwaters for Drinking and Irrigation Purposes: Insights from a Case Study (Jinta Basin, Heihe Drainage Area, Northwest China)

Preliminary geochemical characterization of saline formation water from Miocene reservoirs, offshore Niger Delta

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