Dynamics of major and trace elements during seawater intrusion in a coastal sedimentary aquifer impacted by anthropogenic activities

Mora, Abrahan; Mahlknecht, Jürgen; Ledesma-Ruiz, Rogelio; Sanford, W. E.; Lesser, Luis E.

doi:10.1016/j.jconhyd.2020.103653

Cited by 28 publications

(9 citation statements)

References 52 publications

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“…The highest concentration was found in the shallow wells, mostly affected by seawater intrusion. Mora et al [ 66 ] reported increasing of boron concentration during the seawater intrusion process in an aquifer system in Baja California, Mexico. They concluded that the seawater intrusion process mainly controls boron elevated concentration with no effect from the anion exchange process.…”

Section: Resultsmentioning

confidence: 99%

Integrated clustering analysis for delineating seawater intrusion and heavy metals in Arabian Gulf Coastal groundwater of Saudi Arabia

Benaafi,

Abba,

Tawabini

et al. 2023

Heliyon

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Section: Resultsmentioning

confidence: 99%

Integrated clustering analysis for delineating seawater intrusion and heavy metals in Arabian Gulf Coastal groundwater of Saudi Arabia

Benaafi,

Abba,

Tawabini

et al. 2023

Heliyon

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“…In addition to geomorphological factors, the processes that condition the chemical composition of groundwater can be influenced by the interaction of climatic and geological factors. Thus, the geochemical evolution of groundwater depends on several factors such as recharge variations resulting from changes in the local water balance (Carol, Braga, et al, 2015; Carretero et al, 2013; Fu et al, 2019; García‐Menéndez et al, 2021; Riedel & Weber, 2020), the atmospheric aerosol that conditions the chemical composition of recharge water (Lutterodt et al, 2021), the water–sediment interaction (Greggio et al, 2020; Hallett et al, 2015; Mora et al, 2020; Smedley & Kinniburgh, 2002) as well as the interactions of groundwater with surface water and with the underlying marine water (Hingst et al, 2023; Karanth, 1997). These geochemical processes would be responsible for seasonal and spatial variations of groundwater chemistry (Carol & Kruse, 2012; Matthees, 1982).…”

Section: Introductionmentioning

confidence: 99%

Hydrogeochemical processes as a conditioner of freshwater lenses associated with coastal deposits

Julieta,

Álvarez,

Carolina

et al. 2024

Hydrological Processes

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The aim of this work was to study the processes and factors conditioning the hydrochemistry of freshwater lenses associated with Holocene coastal deposits in an area of the Argentinean Atlantic coast. For this purpose, geomorphological units were mapped and a shallow groundwater monitoring network was established, including pre‐existing boreholes and shallow exploration wells. During the construction of the shallow exploration wells, sediment samples were extracted to determine the texture and mineralogical characteristics. Four samplings were carried out to measure in situ physicochemical parameters and to determine majority ions in the water. The chemical data were analysed considering the associated geomorphology, lithology, water balance and hydrodynamics. The geomorphological and lithological characteristics are the combined factors that favour the preferential rainwater recharge processes. Geoforms with greater topography and extension (continental and coastal dunes) tend to store freshwater lenses, while those with lower topography and little areal extension (sand sheets and beach ridges) have very thin lenses and tend to become salinized. Climate and local water balance are factor that determines that groundwater recharge occurs preferentially in winter. This causes increases in groundwater levels and a decrease in the groundwater EC. On the other hand, mineralogy is a factor that conditions the geochemical processes associated with the water–sediment interaction. Within the main geochemical processes, the dissolution and/or mineral weathering, the dissolution of CO2(g) and ion exchange determine the presence of different hydrochemical facies, where Ca‐HCO3 facies dominates in elevated geoforms, while Na‐Cl in lower ones. The results obtained in this work have provided an understanding of the factors and processes that condition groundwater chemistry in coastal deposits, being of vital importance for the management of water resources.

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“…However, these vital water sources face significant challenges due to the different origins of salinization, including nitrate contamination. Salinization, which can result from natural factors such as the dissolution of soluble salts [1,2], seawater intrusion [3] and ion exchange reactions with minerals in the aquifer matrix [4], as well as anthropogenic activities such as excessive irrigation and improper waste disposal, poses a threat to groundwater quality and availability. Similarly, nitrate pollution in coastal aquifers is a serious problem caused by both natural processes and human activities.…”

Section: Introductionmentioning

confidence: 99%

Hydrogeochemical processes and nitrate contamination of shallow groundwater in the Gareb-Bouareg region, northeastern Morocco

Chamrar,

Oujidi,

El Haddar

et al. 2024

E3S Web Conf.

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In semiarid regions, groundwater faces considerable challenges due to both natural and human-induced contaminants, including nitrate contamination. These issues impact the availability of groundwater, a vital resource. Therefore, it is crucial to identify the sources and mechanisms contributing to salinization and nitrate contamination. In this study, we examined the hydrogeochemical characteristics of shallow groundwater in the Gareb-Bouareg region, northeast Morocco. The aim was to determine and understand the key processes that govern its chemical composition and assess nitrate contamination. A total of 50 groundwater samples were collected from existing wells and analysed for major cation and anion concentrations. The results showed that the dissolution of evaporite minerals, cation exchange and evaporation are the predominant processes of groundwater mineralization. In 72% of the samples, nitrate concentrations surpassed the anthropogenic origin threshold value of 10 mg/L, while 16% of the samples exceeded the drinking water standard of 50 mg/L. The highest values were found in the rural and urban areas, at 122 mg/L and 84.24 mg/L, respectively. Nitrate levels and the depth to the water table reveal the impacts of surface contamination sources. The spatial distribution and interrelationship between nitrate and other parameters suggest possible distinct origins of dissolved nitrates associated with various anthropogenic activities.

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Dynamics of major and trace elements during seawater intrusion in a coastal sedimentary aquifer impacted by anthropogenic activities

Cited by 28 publications

References 52 publications

Integrated clustering analysis for delineating seawater intrusion and heavy metals in Arabian Gulf Coastal groundwater of Saudi Arabia

Integrated clustering analysis for delineating seawater intrusion and heavy metals in Arabian Gulf Coastal groundwater of Saudi Arabia

Hydrogeochemical processes as a conditioner of freshwater lenses associated with coastal deposits

Hydrogeochemical processes and nitrate contamination of shallow groundwater in the Gareb-Bouareg region, northeastern Morocco

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