Geochemical processes controlling groundwater quality under semi arid environment: A case study in central Morocco

Karroum, Morad; Elgettafi, Mohammed; Elmandour, A.; Wilske, Cornelia; Himi, Mahjoub; Casas, Albert

doi:10.1016/j.scitotenv.2017.07.199

Cited by 87 publications

(20 citation statements)

References 30 publications

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“…In fact, δ 18 O positive values were found in meteoric and surface waters, reflecting larger durations of residence. Similar positive values in water bodies have been reported in the same arid regions [46][47][48]. Stream runoff samples do not fall in the LMWL.…”

Section: Isotopic Composition Of Watersupporting

confidence: 86%

Integration of Isotopic (2H and 18O) and Geophysical Applications to Define a Groundwater Conceptual Model in Semiarid Regions

Pacheco-Guerrero

Gonzalez-Trinidad

Júnez-Ferreira

et al. 2019

Water

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One-third of the global population depends on groundwater for drinking, which is an even larger proportion for arid regions. The integration of isotopic and geophysical applications has been very useful in understanding the process of groundwater recharge. The aim of this study is to define a conceptual model that describes groundwater functions within an aquifer located in a semi-arid region by identifying recharge patterns based on the isotopic characteristics of: Rainfall, surface water, shallow and deep groundwater, and incorporating regional geophysical data. We demonstrated that rainfall was affected by sub-cloud evaporation and altitude. Shallow and deep modern groundwater samples were clustered and exhibited similar evolution from rainfall. However, different groups recharged from different precipitation sources compared to the local one. In the current study, we analyzed the isotopic evolution of deep groundwater over a 10-year period, which was mainly affected by the incorporation of different flows with different isotopic signatures and the hydrodynamics of the area. We performed two geoelectrical sections in the study area to improve the understanding of the hydrogeological setting and water movement patterns. The new conceptual model should help stakeholders in the context of water management policies for the study area.

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Section: Isotopic Composition Of Watersupporting

confidence: 86%

Integration of Isotopic (2H and 18O) and Geophysical Applications to Define a Groundwater Conceptual Model in Semiarid Regions

Pacheco-Guerrero

Gonzalez-Trinidad

Júnez-Ferreira

et al. 2019

Water

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“…In the central part of Morocco (Tensift-Haouz basin in Figure 2a), recent studies [44,45] found that the groundwater on the Tensift plains (Bahira and Haouz) is relatively degraded. Hydrochemical data show geological control on water quality in addition to different anthropogenic activities.…”

Section: Inland Aquifersmentioning

confidence: 99%

Moroccan Groundwater Resources and Evolution with Global Climate Changes

et al. 2020

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In semi-arid areas, many ecosystems and activities depend essentially on water availability. In Morocco, the increase of water demands combined to climate change induced decrease of precipitation put a lot of pressure on groundwater. This paper reports the results of updating and evaluation of groundwater datasets with regards to climate scenarios and institutional choices. The continuous imbalance between groundwater extraction and recharge caused a dramatic decline in groundwater levels (20 to 65 m in the past 30 years). Additionally, Morocco suffers from the degradation in groundwater quality due to seawater intrusion, nitrate pollution and natural salinity changes. Climate data analysis and scenarios predict that temperatures will increase by 2 to 4 °C and precipitation will decrease by 53% in all catchments over this century. Consequently, surface water availability will drastically decrease, which will lead to more extensive use of groundwater. Without appropriate measures, this situation will jeopardize water security in Morocco. In this paper, we zoom on the case the Souss-Massa basin, where management plans (artificial recharge, seawater desalination, and wastewater reuse) have been adopted to restore groundwater imbalance or, at least, mitigate the recorded deficits. These plans may save water for future generations and sustain crop production.

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“…Except for a few water samples, Cl − contents in most water samples of the four spring groups increase with the increase of NO 3 − (Figure 7f), which suggests a certain impact of human activities on spring water, in the study area. The saturation index (SI) is an indicator that is often used in hydrogeochemistry to determine the saturation state of mineral phases in groundwater [35][36][37]. In this regard, the states of the mineral, in the supersaturated state, the equilibrium state, and the unsaturated state are indicated by SI > 0, SI = 0, and SI < 0, respectively.…”

Section: Spring Water Chemistry Formation Mechanismsmentioning

confidence: 99%

Temporal Variations of Spring Water in Karst Areas: A Case Study of Jinan Spring Area, Northern China

Gao

Liu

et al. 2020

Water

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Jinan is known as “Spring City,” because of its famous 72 artesian springs. Spring water plays an important role in the social and economic development of Jinan. However, the accelerating process of urbanization and more intensive human activities have significantly affected the Jinan springs. Based on the data from four spring groups (2015–2018), the hydrochemical characteristics of spring water were analyzed and 14 parameters were selected to evaluate the quality of spring water. In addition, the main ions variation characteristics of spring water in Jinan from 1958 to 2018 were analyzed, based on the previous studies. Subsequently, the spring flow dynamics of the Jinan spring area from 1958 to 2012 were also discussed. Overall, the water quality of the four spring groups is good. The chemical composition of the spring water is mainly controlled by the dissolution of calcite, followed by dolomite, and de-dolomitization. However, spring water is affected by human activities, and the hydrochemical type tends to evolve from HCO3-Ca to HCO3·SO4-Ca or HCO3-Ca·Mg. From 1958 to 2013, the main ions in spring water increased, while a relatively steady and certain fluctuation trend was observed from 2015 to 2018. Since 1958, the spring water flow in Jinan has experienced four stages, from decline to recovery. The exploitation of karst groundwater, change of land use type, and decrease of atmospheric precipitation are the three most important factors, affecting spring discharge dynamics. The slowdown of the increase of the main ion concentration in Jinan spring water and the resumption of spring water flowing indicate that remarkable achievements have been made to protect spring water, but there is still a long way to go to fully protect Jinan spring water.

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Geochemical processes controlling groundwater quality under semi arid environment: A case study in central Morocco

Cited by 87 publications

References 30 publications

Integration of Isotopic (2H and 18O) and Geophysical Applications to Define a Groundwater Conceptual Model in Semiarid Regions

Integration of Isotopic (2H and 18O) and Geophysical Applications to Define a Groundwater Conceptual Model in Semiarid Regions

Moroccan Groundwater Resources and Evolution with Global Climate Changes

Temporal Variations of Spring Water in Karst Areas: A Case Study of Jinan Spring Area, Northern China

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