Hydrogeochemical processes in an arid region of Europe (Almeria, SE Spain)

Martos, Francisco Sánchez; Bosch, Antonio Pulido; Calaforra, J. M.

doi:10.1016/s0883-2927(98)00094-8

Cited by 68 publications

(21 citation statements)

References 14 publications

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“…Ionic ratios of groundwaters are often used to assess the seawater intrusion in coastal regions (Sanchez-Martos et al 1999;Kim et al 2003). As previously noted in this study, TDS is an often a good surrogate for Cl − and thus the ratio is the good indicator of salinization due to the seawater encroachment (Nwankwoala and Judom 2011).…”

Section: Relationship Of CL − /Hco 3 − Ratiomentioning

confidence: 65%

Assessment of hydrogeochemical status of groundwater in a coastal region of Southeast coast of India

et al. 2018

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A study was conducted in a coastal region of Cuddalore district of Tamil Nadu, India, to identify the hydrogeochemical processes controlling the groundwater chemistry. The major geological units of the study area are sandstone, clay, alluvium, and laterite soils of Tertiary and Quaternary age. A total of 64 groundwater samples were measured for major ions and stable isotopes. Higher electrical conductivity values indicate the poor quality groundwater along the coastal region. Saline water intrusion mainly affects the hydrochemical composition of the aquifer water reflected by Na-Cl-type waters. Cl − / (Cl − + HCO 3 − ) ratio also indicates the mixing of fresh groundwater with saline water. The results of δD and δ 18 O analyses show that isotopic compositions of groundwater ranges from − 7.7 to − 2.1‰ for δ 18 O and from − 55.6 to − 18.5‰ for δD. Correlation and factor analysis were carried out to find the association of ions and to determine the major factors controlling the groundwater chemistry of the region. The study indicates that ion exchange, weathering, salt water intrusion along the coast, and anthropogenic impacts are the major controlling factors for the groundwater chemistry of the region.

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Section: Relationship Of CL − /Hco 3 − Ratiomentioning

confidence: 65%

Assessment of hydrogeochemical status of groundwater in a coastal region of Southeast coast of India

et al. 2018

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“…Conservative seawater-freshwater mixing is expected to show a linear increase in Na + and Cl − [76], which is reflected by the high correlation coefficient (r = 0.94) between both variables ( Figure 10a). Effects of seawater encroachment have been evaluated by studying the Na/Cl ionic ratio.…”

Section: Ionic Ratiomentioning

confidence: 99%

Groundwater Overexploitation and Seawater Intrusion in Coastal Areas of Arid and Semi-Arid Regions

Alfarrah

Walraevens

2018

Water

252

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Abstract:The exploitation of groundwater resources is of high importance and has become very crucial in the last decades, especially in coastal areas of arid and semi-arid regions. The coastal aquifers in these regions are particularly at risk due to intrusion of salty marine water. One example is the case of Tripoli city at the Mediterranean coast of Jifarah Plain, North West Libya. Libya has experienced progressive seawater intrusion in the coastal aquifers since the 1930s because of its ever increasing water demand from underground water resources. Tripoli city is a typical area where the contamination of the aquifer in the form of saltwater intrusion is very developed. Sixty-four groundwater samples were collected from the study area and analyzed for certain parameters that indicate salinization and pollution of the aquifer. The results demonstrate high values of the parameters Electrical Conductivity, Na + , K + , Mg 2+ , Cl − and SO 4 2− , which can be attributed to seawater intrusion, where Cl − is the major pollutant of the aquifer. The water types according to the Stuyfzand groundwater classification are mostly CaCl, NaCl and Ca/MgMix. These water types indicate that groundwater chemistry is changed by cation exchange reactions during the mixing process between freshwater and seawater. The intensive extraction of groundwater from the aquifer reduces freshwater outflow to the sea, creates drawdown cones and lowering of the water table to as much as 25 m below mean sea level. Irrigation with nitrogen fertilizers and domestic sewage and movement of contaminants in areas of high hydraulic gradients within the drawdown cones probably are responsible for the high NO 3 − concentration in the region.

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“…For comprehensive study of seawater ingress along the coastal aquifers, ionic ratios are widely used (Batayneh et al 2014;Barbecot et al 2000;El Moujabber et al 2006;Kim et al 2003;Sanchez Martos et al 1999). Apart from chemistry of groundwater, mineralogy of rocks can also be utilised to some extent (Nwankwoala and Udom 2011 (Fig.…”

Section: Ionic Ratiosmentioning

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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Hydrogeochemical processes in an arid region of Europe (Almeria, SE Spain)

Cited by 68 publications

References 14 publications

Assessment of hydrogeochemical status of groundwater in a coastal region of Southeast coast of India

Assessment of hydrogeochemical status of groundwater in a coastal region of Southeast coast of India

Groundwater Overexploitation and Seawater Intrusion in Coastal Areas of Arid and Semi-Arid Regions

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

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