Assessing seawater intrusion in an arid coastal aquifer under high anthropogenic influence using major constituents, Sr and B isotopes in groundwater

Mahlknecht, Jürgen; Merchán, Daniel; Rosner, Martin; Meixner, Anette; Ledesma-Ruiz, Rogelio

doi:10.1016/j.scitotenv.2017.02.137

Cited by 137 publications

(44 citation statements)

References 30 publications

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“…Shallow groundwater shows low B concentration (location or samples 1); marine aerosols contributing to SA recharge can explain this isotopic signature [50]. In contrast, in high-concentration samples of IA and DA (location 2 and 3), an influence of seawater can be confirmed.…”

Section: Geochemical Featuresmentioning

confidence: 89%

The Compatibility of Geothermal Power Plants with Groundwater Dependent Ecosystems: The Case of the Cesine Wetland (Southern Italy)

et al. 2018

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Abstract:The Cesine Wetland, located along the Adriatic coast, was recognized as a Wetland of International Interest and a National Natural Park. Managed by the "World Wide Fund for nature" (WWF), it is considered a groundwater dependent ecosystem which is affected by seawater intrusion. The site was selected to test the environmental compatibility of a low-enthalpy geothermal power plant (closed loop) operating in the aquifer saturated portion with purpose to improving the visitor centre. For this purpose, the long-lasting thermal impact on groundwater was assessed using a multi-methodological approach. The complex aquifer system was carefully studied with geological, hydrogeological and geochemical surveys, including chemical and isotopic laboratory analyses of surface water, groundwater and seawater. The isotopes δ 18 O, δD, δ 11 B, and 3 H were useful to clarify the recharge contribution, the water mixing and the water age. All information was used to improve the conceptualization of the water system, including aquifers and the boundary conditions for a density driven numerical groundwater model. The purpose was to forecast anthropogenic thermal groundwater variations up to 10 years of plant working before the plant realization and to validate the solution after some working years. All results show the environmental compatibility notwithstanding the peculiar ecological environment.

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Section: Geochemical Featuresmentioning

confidence: 89%

The Compatibility of Geothermal Power Plants with Groundwater Dependent Ecosystems: The Case of the Cesine Wetland (Southern Italy)

et al. 2018

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“…The major cations influencing water salinity are sodium, potassium, calcium, and magnesium (Hem, 1985) -all are essential macrominerals for human needed in bulk daily amounts (Cook, 2013). High drinking water salinity (i.e., elevated EC) contains higher concentrations of these elements in drinking water (Alfarrah & Walraevens, 2018;Hoque & Butler, 2015;Mahlknecht et al, 2017;Park et al, 2012). However, these macrominerals do not contribute equally to EC at all levels.…”

Section: Discussionmentioning

confidence: 99%

Modeling the Relationship of Groundwater Salinity to Neonatal and Infant Mortality From the Bangladesh Demographic Health Survey 2000 to 2014

et al. 2020

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We evaluated the relationship of drinking water salinity to neonatal and infant mortality using Bangladesh Demographic Health Surveys of 2000, 2004, 2007, 2011, and 2014. Point data of groundwater electrical conductivity (EC)— a measure of salinity—were collated from the Bangladesh Water Development Board and digitizing salinity contour map. Data for groundwater dissolved elements (sodium, calcium, magnesium, and potassium) data came from a national hydrochemistry survey in Bangladesh. Point EC and dissolved minerals data were then interpolated over entire Bangladesh and extracted to each cluster location, the primary sampling unit of Bangladesh Demographic Health Surveys. We used restricted cubic splines and survey design‐specific logistic regression models to determine the relationship of water salinity to neonatal and infant mortality. A U‐shaped association between drinking water salinity and neonatal and infant mortality was found, suggesting higher mortality when salinity was very low and high. Compared to mildly saline (EC ≥0.7 and < 2 mS/cm) water drinkers, freshwater (EC < 0.7 mS/cm) drinkers had 1.37 (95% CI: 1.01, 1.84) times higher neonatal mortality and 1.43 (95% CI: 1.08, 1.89) times higher infant mortality. Compared to mildly saline water drinkers, severe‐saline (EC ≥10 mS/cm) water drinkers had 1.77 (95% CI: 1.17, 2.68) times higher neonatal mortality and 1.93 (95% CI: 1.35, 2.76) times higher infant mortality. We found that mild‐salinity water had a high concentration of calcium and magnesium, whereas severe‐salinity water had a high concentration of sodium. Freshwater had the least concentrations of salubrious calcium and magnesium.

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“…A partir de la distribución de concentración de STD en el agua subterránea se puede inferir y delimitar la intrusión marina en un acuífero costero, tal como lo hace la CONAGUA en los acuíferos de México, por lo que con medidas relativamente simples como el monitoreo de la conductividad eléctrica en los pozos de bombeo, se puede indicar la intrusión del agua de mar (Mahlknecht et al, 2017), no obstante, es importante considerar el tipo de sales presentes para verif icar si corresponden al agua de mar. Al igual que las concentraciones de STD, la concentración de sales en el acuífero presentó una leve disminución después de las lluvias en la zona donde se localiza la batería de pozos de agua potable, sin embargo, cerca de la costa se observó un incremento.…”

Section: Distribución De Salesunclassified

“…Lo anterior plantea una amplia zona de mezcla de agua de mar debido a la intrusión marina con agua dulce producto de la recarga natural por flujo subterráneo que alcanza a llegar a los pozos en la zona costera. Mahlknecht et al (2017) reportan que se está produciendo un importante proceso de intercambio de cationes en el acuífero, con sodio de agua de mar reemplazando el calcio de procedencia continental. Además, el agua de mar con Na + y Cl -como iones dominantes está en contacto con los sedimentos del área costera y su intrusión induce un intercambio de cationes en las partículas del suelo donde se absorbe el Na + y se libera Ca 2+ (Tamez Meléndez et al, 2016).…”

Section: Distribución De Salesunclassified

Familias de agua subterránea y distribución de sólidos totales disueltos en el acuífero de La Paz Baja California Sur, México

Falcón¹,

Diéguez

Jiménez³

et al. 2018

Terra

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The aquifer of La Paz has been overexploited for several years, causing contamination by seawater intrusion. A well-monitoring network, which included public-urban, agricultural, livestock and service use water wells, was set up in 2013. Representative sampling during the dry and rainy seasons was carried out. Concentration of total dissolved solids (TDS), temperature, dissolved oxygen and pH were measured. Results indicate that most agricultural wells contain high TDS concentration, compared to potable water wells with concentration below 1000 mg L-1, which is the limit allowed by the Mexican official standard (MOS). Majority ion data from 14 wells near the coast with high concentration of TDS were also analyzed, with which a Piper diagram was constructed. Two main types of water were found: calcium-chloride and sodium-chloride. The presence of sodium in concentrations exceeding 200 mg L-1 in 8 wells, and magnesium with more than 50 mg L-1 in 10 wells, both above the MOS, reveal that its origin is seawater. Calcium concentrations above 250 mg L‑1 in 7 wells points to the existence of sedimentary layers of chemical-organic origin that compose the inner stratigraphy of the aquifer through which groundwater circulates. High chloride concentrations of more than 1000 mg L-1 in 6 wells with high concentration of TDS, suggests that its source is seawater intrusion. Based on the distribution of TDS concentration, two broad areas affected by seawater intrusion were delimited, and along with the distribution of water families, three main aquifer zones were identified.

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Assessing seawater intrusion in an arid coastal aquifer under high anthropogenic influence using major constituents, Sr and B isotopes in groundwater

Cited by 137 publications

References 30 publications

The Compatibility of Geothermal Power Plants with Groundwater Dependent Ecosystems: The Case of the Cesine Wetland (Southern Italy)

The Compatibility of Geothermal Power Plants with Groundwater Dependent Ecosystems: The Case of the Cesine Wetland (Southern Italy)

Modeling the Relationship of Groundwater Salinity to Neonatal and Infant Mortality From the Bangladesh Demographic Health Survey 2000 to 2014

Familias de agua subterránea y distribución de sólidos totales disueltos en el acuífero de La Paz Baja California Sur, México

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