Identifying groundwater degradation sources in a Mediterranean coastal area experiencing significant multi-origin stresses

Boumaiza, Lamine; Chesnaux, Romain; Drias, Tarek; Walter, Julien; Huneau, Frédéric; Garel, Émilie; Knoeller, Kay; Stumpp, Christine

doi:10.1016/j.scitotenv.2020.141203

Cited by 48 publications

(13 citation statements)

References 106 publications

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“…The relationship between nitrate and chloride (NO 3 − and Cl − ) is widely applied to trace nitrate pollution sources (Li et al, 2010). The correlation between NO 3 − and Cl − from the shallow well that had higher nitrate values than the Brazilian Groundwater Guidelines showed a significant positive correlation (r 2 = 0.62, P = 0.01) (Figure 3), which suggested that nitrate could be originated from untreated sewage and residential buildings (Li et al, 2010;Güller et al, 2012;Boumaiza et al, 2020;Zhang et al, 2020). Similarly, the high variability of chloride on groundwater should be attributed to the widespread use of chlorine in the wells for water disinfection, as corroborated by extensive groundwater microbiological contamination.…”

Section: Resultsmentioning

confidence: 97%

“…Comparing the major ion composition with the Brazilian Groundwater Guidelines (BRASIL, 2008), it was observed that 10% of the samples had higher NO 3 concentrations than the proposed limit for drinking water. According to Zhang et al (2020), high groundwater nitrate concentrations in newly urbanized regions was two or more times higher than those in longstanding urbanized areas, and have a relationship to inadequate wastewater systems (Boumaiza et al, 2020). When comparing the NO 3 values in wells from the fissured and sedimentary aquifers, higher values (8.9 mg L -1 ) were observed in fissured aquifers than in sedimentary ones (1.2 mg L -1 ).…”

Section: Resultsmentioning

confidence: 97%

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Effects of a recent urbanization event on coastal groundwater in the southeastern coast of Brazil: a case study of the Macaé municipality

Silva

Silva-Filho

Leite

et al. 2021

Rev. Bras. Ciênc. Ambient.

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Coastal groundwater is extremely vulnerable to land-based human activities and seawater intrusion. In Brazil, a developing country, several coastal cities are undergoing recent urbanization with no planning, giving rise to problems such as groundwater overexploitation, sanitation, and chemical contamination. This study provides seasonal and spatial groundwater chemical and microbiological characterization of a recently urbanized coastal region, discussing contamination and salinization. The recent urbanization event affected both shallow and deep wells represented by the extensive presence of Escherichia coli on groundwater and nitrate, ammonium, arsenic, and lead (NO3-, NH4+, As and Pb) levels above groundwater safety guidelines. In contrast, iron and manganese (Fe and Mn) concentrations above the safety limit were associated with lithological enrichment, but might also restrict groundwater consumption. In addition to chemical and microbiological contamination, salinization of coastal aquifers did not pose a threat in this shoreline, but brackish groundwater was found in one well influenced by a coastal lagoon sandbar opening that allowed seawater to enter the aquifer.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 97%

Effects of a recent urbanization event on coastal groundwater in the southeastern coast of Brazil: a case study of the Macaé municipality

Silva

Silva-Filho

Leite

et al. 2021

Rev. Bras. Ciênc. Ambient.

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“…Again, only two papers recognized the geothermal sources as the main salinization mechanism in coastal aquifers [203,204]. Finally, some studies encompass the recognition of multiple sources of salinity such as geothermal fluids, actual and paleo-seawaters, evaporitic rocks dissolution, and anthropogenic sources [205][206][207][208][209][210]. It is worth remembering here that these latter processes are much more relevant in inland areas.…”

Section: Groundwater Salinization Origins and Mechanismsmentioning

confidence: 99%

The Issue of Groundwater Salinization in Coastal Areas of the Mediterranean Region: A Review

Mastrocicco

Colombani

2021

Water

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The Mediterranean area is undergoing intensive demographic, social, cultural, economic, and environmental changes. This generates multiple environmental pressures such as increased demand for water resources, generation of pollution related to wastewater discharge, and land consumption. In the Mediterranean area, recent climate change studies forecast large impacts on the hydrologic cycle. Thus, in the next years, surface and ground-water resources will be gradually more stressed, especially in coastal areas. In this review paper, the historical and geographical distribution of peer-review studies and the main mechanisms that promote aquifer salinization in the Mediterranean area are critically discussed, providing the state of the art on topics such as actual saltwater wedge characterization, paleo-salinities in coastal areas, water-rock interactions, geophysical techniques aimed at delineating the areal and vertical extent of saltwater intrusion, management of groundwater overexploitation using numerical models and GIS mapping techniques for aquifer vulnerability to salinization. Each of the above-mentioned approaches has potential advantages and drawbacks; thus, the best tactic to tackle coastal aquifer management is to employ a combination of approaches. Finally, the number of studies focusing on predictions of climate change effects on coastal aquifers are growing but are still very limited and surely need further research.

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“…Groundwater supports ecosystems and anthropogenic activities; and is critical to human health. In recent decades, increased groundwater use and overexploitation has become a serious threat to water security due to rapid deterioration of both groundwater quantity and quality (Kammoun et al, 2018; Seddique et al, 2019; Boumaiza et al, 2020), and demand for groundwater are expected to continue to increase globally (Achu et al, 2020). The implementation of sustainable groundwater management strategies are required to anticipate and mitigate groundwater deficit scenarios and to sustain or increase current qualities of life.…”

Section: Introductionmentioning

confidence: 99%

Groundwater recharge over the past 100 years: Regional spatiotemporal assessment and climate change impact over the Saguenay‐Lac‐Saint‐Jean region, Canada

Boumaiza

Walter

Chesnaux

et al. 2022

Hydrological Processes

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Proper knowledge of potential groundwater recharge (PGR) and its spatiotemporal distribution are essential for sustainable groundwater management, especially within the context of climate change. Here, a robust GIS‐based water budget framework was developed to estimate PGR at a regional scale and map its spatial distribution. This framework is demonstrated over the Saguenay‐Lac‐Saint‐Jean region (13 200 km2) of Quebec (Canada). The PGR mapping process was based on a model incorporating water budget components. The vertical inflows (VI) include water amounts from rainfall and snowmelt, whereby the latter was assessed using HYDROTEL model. VI were combined with the maximum and minimum temperatures to estimate actual evapotranspiration (AET), while the surface runoff (RuS) was assessed using the curve number method. Field observations of annual variation in temperatures and the water budget components, over a period of 100 years (1910–2009), were used to provide a comprehensive overview of the effects of climate change on PGR. The last 10 years of the observation period (i.e., 2000–2009) indicate that 6% of the study area has PGR rates of 35%–50%. PGR rates of 20%–35% occur in 58% of the study area, while 36% have PGR of 5%–20%. The trend analysis of temperature time series reveals an average of 1.1 ± 0.6°C increase over 100 years. Also, an increase in the water budget components is observed. Despite the increasing trends of RuS and AET, PGR still showed an increasing trend with an average increase of 0.7 ± 0.4 mm/year over the past 100 years. This observation indicates that the increase in VI was enough to compensate for the increases in AET and RuS. This finding of an increasing PGR in the study area provides useful information for future studies focusing on predicting long‐term PGR evolution and for the development of efficient long‐term groundwater management strategies.

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Identifying groundwater degradation sources in a Mediterranean coastal area experiencing significant multi-origin stresses

Cited by 48 publications

References 106 publications

Effects of a recent urbanization event on coastal groundwater in the southeastern coast of Brazil: a case study of the Macaé municipality

Effects of a recent urbanization event on coastal groundwater in the southeastern coast of Brazil: a case study of the Macaé municipality

The Issue of Groundwater Salinization in Coastal Areas of the Mediterranean Region: A Review

Groundwater recharge over the past 100 years: Regional spatiotemporal assessment and climate change impact over the Saguenay‐Lac‐Saint‐Jean region, Canada

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