The use of environmental markers to identify groundwater salinization sources in a Neogene basin, Kert aquifer case, NE Morocco

AbstractThe city of Essaouira is located along the north-west coast of Morocco, where groundwater is the main source of drinking, domestic and agricultural water. In recent decades, the salinity of groundwater has increased, which is why geochemical techniques and environmental isotopes have been used to determine the main sources of groundwater recharge and salinization. The hydrochemical study shows that for the years 1995, 2007, 2016 and 2019, the chemical composition of groundwater in the study area consists of HCO3–Ca–Mg, Cl–Ca–Mg, SO4–Ca and Cl–Na chemical facies. The results show that from 1995 to 2019, electrical conductivity increased and that could be explained by a decrease in annual rainfall in relation to climate change and water–rock interaction processes. Geochemical and environmental isotope data show that the main geochemical mechanisms controlling the hydrochemical evolution of groundwater in the Cenomanian–Turonian aquifer are the water–rock interaction and the cation exchange process. The diagram of δ2H = 8 * δ18O + 10 shows that the isotopic contents are close or above to the Global Meteoric Water Line, which suggests that the aquifer is recharged by precipitation of Atlantic origin. In conclusion, groundwater withdrawal should be well controlled to prevent groundwater salinization and further intrusion of seawater due to the lack of annual groundwater recharge in the Essaouira region.

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An assessment of groundwater salinization in Haryana state in India using hydrochemical tools in association with GIS

Environmental Earth Sciences ◽

10.1007/s12665-017-6789-0 ◽

2017 ◽

Vol 76 (13) ◽

Cited By ~ 10

Author(s):

Muzzafar Ahmad Sheikh ◽

C. Azad ◽

S. Mukherjee ◽

Kumari Rina

Keyword(s):

Groundwater Salinization

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Impact of hydrogeological factors on groundwater salinization due to ocean-surge inundation

Advances in Water Resources ◽

10.1016/j.advwatres.2017.11.017 ◽

2018 ◽

Vol 111 ◽

pp. 423-434 ◽

Cited By ~ 8

Author(s):

Jie Yang ◽

Huichen Zhang ◽

Xuan Yu ◽

Thomas Graf ◽

Holly A. Michael

Keyword(s):

Groundwater Salinization

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Groundwater salinization caused by excessive pumping during a construction project

Japanese Journal of Limnology (Rikusuigaku Zasshi) ◽

10.3739/rikusui.65.83 ◽

2004 ◽

Vol 65 (2) ◽

pp. 83-92 ◽

Cited By ~ 1

Author(s):

Kunimitsu INOUCHI ◽

Hideki YASUTOMI

Keyword(s):

Construction Project ◽

Groundwater Salinization

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Major ion composition and 87Sr/86Sr of groundwater in the coastal Gujarat alluvial plain, India

10.5194/egusphere-egu21-9366 ◽

2021 ◽

Author(s):

Abul Qasim ◽

Satinder Pal Singh

Keyword(s):

Major Ions ◽

Alluvial Plain ◽

Groundwater Salinization ◽

Narmada River ◽

Groundwater Samples ◽

Hydrogeochemical Facies ◽

Global Warming Scenario ◽

Marine Influence ◽

Binary Mixing ◽

Regional Groundwater

Major ions, Sr concentration, and 87Sr/86Sr have been analyzed in groundwater of the coastal Gujarat Alluvial Plain, collected during monsoon, post-monsoon, and pre-monsoon seasons of 2016&#8211;2017. The major objective of this study was to understand the regional groundwater salinization mechanism. In the study area, the groundwater is mostly characterized by Na-Cl facies, with few samples of Ca-Cl, Ca-Mg-Cl, Na-Ca-HCO3, and Ca-Mg-HCO3 types. Whereas, the Narmada and the Tapi river water samples are particularly of Ca-Mg-HCO3 type. The hydrogeochemical facies evolution (HFE) diagram depicts the coastal groundwater freshening irrespective of the season ruling out the lateral seawater intrusion far inland. However, the 87Sr/86Sr and Br/Cl ratios strongly suggest the modern marine influence on the regional groundwater. In the plot of 1/Sr versus 87Sr/86Sr, most of the groundwater samples fall on the binary mixing line between the seepage groundwater and modern seawater endmembers. Therefore, we suspect that the up-coning of recently trapped seawater by groundwater over-extraction is the most plausible reason for the groundwater salinization, which indicate the vulnerability of the coastal Gujarat alluvial plain to the near future sea ingress under the global warming scenario. A few exceptional groundwater samples far north of the Narmada River show more radiogenic 87Sr/86Sr indicative of silicate weathering.

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Mercury Speciation in the Water Distribution System of Skiathos Island, Greece

Proceedings ◽

10.3390/proceedings2110668 ◽

2018 ◽

Vol 2 (11) ◽

pp. 668

Author(s):

Alexandra Spyropoulou ◽

Yannis G. Lazarou ◽

Chrysi Laspidou

Keyword(s):

Distribution System ◽

Water Distribution ◽

Water Distribution System ◽

Tap Water ◽

World Health Organisation ◽

World Health ◽

Urban Water ◽

Groundwater Salinization ◽

The World ◽

Standard Set

In recent years, mercury (Hg) concentration that exceeds the Maximum Contaminant Level Standard set by the World Health Organisation for drinking water has been detected in the groundwater of Skiathos Island in Greece. The island single source of urban water is groundwater; as a result, tap water has been characterised as unsafe for drinking and people rely on bottled water for their everyday needs. The origin and speciation of Hg in the aquifer is investigated with the use of the Pourbaix diagram, while the possible correlation with groundwater salinization due to seawater intrusion is examined.

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