A multi-isotopic evaluation of groundwater in a rapidly developing area and implications for water management in hyper-arid regions

Gómez-Alday, Juan José; Hussein, Saber; Arman, Hasan; Alshamsi, Dalal; Murad, Ahmed; Elhaj, K.; Aldahan, Ala

doi:10.1016/j.scitotenv.2021.150245

Cited by 17 publications

(3 citation statements)

References 45 publications

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“…Second, the isotope fractionation process may obscure the initial isotopic compositions [38]. Therefore, other isotopes (e.g., δ 2 H/δ 18 O-H 2 O and δ 11 B), water chemistry (e.g., Cl − and SO 4 2− ), and hydrogeochemical parameters were jointly applied to enhance the accuracy of NO 3 − source identification [22,[43][44][45][46][47][48]. The integration of these additional data sets is expected to provide valuable and definitive insights into both water and NO 3 − cycling dynamics.…”

Section: High Nomentioning

confidence: 99%

Nitrate Source and Transformation in Groundwater under Urban and Agricultural Arid Environment in the Southeastern Nile Delta, Egypt

Kasem,

Xu,

Jiang

et al. 2023

Water

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With the intensification of human activities, nitrate pollutants in groundwater are receiving increasing attention worldwide. Especially in the arid Nile Delta of Egypt, groundwater is one of the most valuable water resources in the region. Identifying the source of nitrate in groundwater with strong human disturbances is important to effective water resource management. This paper examined the stable isotopes (δ15N/δ18O-NO3 and δ2H/δ18O-H2O) and the hydrogeochemical parameters of the shallow groundwaters in the arid southeast of the Nile Delta to assess the potential sources and transformation processes of nitrate under severe urban and agricultural activities. The results revealed that the groundwaters were recharged by the Nile River. Meanwhile, the infiltration of irrigation water occurred in the west, while the mixing with the deep groundwater occurred in the east regions of the study area. The TDS, SO42−, NO3−, and Mn2+ concentrations of groundwaters (n = 55) exceeded the WHO permissible limit with 34.6%, 23.6%, 23.6%, and 65.5%, respectively. The NO3− concentrations in the shallow groundwaters ranged from 0.42 mg/L to 652 mg/L, and the higher levels were observed in the middle region of the study area where the unconfined condition prevailed. It extended to the deep groundwater and eastward of the study area in the groundwater flow direction. The δ15N-NO3 and δ18O-NO3 values suggested that the groundwater NO3− in the west and east regions of semi-confined condition were largely from the nitrification of soil organic nitrogen (SON) and chemical fertilizer (CF). In contrast, wastewater input (e.g., domestic sewage and unlined drains) and prevalent denitrification were identified in the middle region. The denitrification might be tightly coupled with the biogeochemical cycling of manganese. This study provides the first report on the groundwater NO3− dynamics in the Nile Delta, which generated valuable clues for effective water resource management in the arid region.

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Section: High Nomentioning

confidence: 99%

Nitrate Source and Transformation in Groundwater under Urban and Agricultural Arid Environment in the Southeastern Nile Delta, Egypt

Kasem,

Xu,

Jiang

et al. 2023

Water

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“…Apart from the chloride (Cl − ) content, a high concentration of nitrate (NO 3 − ) (>45 mg/L) [47] is also observed in 30% of the groundwater samples due to agricultural activities and semi-arid climatic conditions. However, the sulfate (SO 4 2− ) concentration is between 12.29 and 195.94 mg/L with an average of 40.61 mg/L, indicating that the various sources such as pesticides used for agricultural productivity, evaporate dissolution, and domestic sewages are responsible for the high concentration of sulfate [48,49]. Calcium (Ca 2+ ) is the most abundant ion; it ranges from 21.92 to 183.60 mg/L (average 87.04 mg/L), and it is derived from calc-silicate minerals due to chemical weathering and the dissolution of calcium carbonate minerals [50].…”

Section: Hydrogeochemical Studies 411 General Hydrogeochemistrymentioning

confidence: 99%

Recharge and Geochemical Evolution of Groundwater in Fractured Basement Aquifers (NW India): Insights from Environmental Isotopes (δ18O, δ2H, and 3H) and Hydrogeochemical Studies

Pradhan

Behera

Kumar

et al. 2022

Water

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Considering water as a limiting factor for socio-economic development, especially in arid/semi-arid regions, both scientific communities and policymakers are interested in groundwater recharge-related data. India is fast moving toward a crisis of groundwater due to intense abstraction and contamination. There is a lack of understanding regarding the occurrence, movement, and behaviors of groundwater in a fractured basement terrane. Therefore, integrated environmental isotopes (δ18O, δ2H, and 3H) and hydrogeochemical studies have been used to understand the recharge processes and geochemical evolution of groundwater in the fractured basement terranes of Gujarat, NW India. Our results show that the relative abundance of major cations and anions in the study basin are Ca2+ > Na+ > Mg2+ > K+ and HCO3− > Cl− > SO42− > NO3−, respectively. This suggests that the chemical weathering of silicate minerals influences the groundwater chemistry in the aquifer system. A change in hydrochemical facies from Ca-HCO3 to Na-Mg-Ca-Cl. HCO3 has been identified from the recharge to discharge areas. Along the groundwater flow direction, the presence of chemical constituents with different concentrations demonstrates that the various geochemical mechanisms are responsible for this geochemical evolution. Furthermore, the chemical composition of groundwater also reflects that the groundwater has interacted with distinct rock types (granites/granulites). The stable isotopes (δ18O and δ2H) of groundwater reveal that the local precipitation is the main source of recharge. However, the groundwater recharge is affected by the evaporation process due to different geological conditions irrespective of topographical differences in the study area. The tritium (3H) content of groundwater suggests that the aquifer is mainly recharged by modern rainfall events. Thus, in semi-arid regions, the geology, weathering, and geologic structures have a significant role in bringing chemical changes in groundwater and smoothening the recharge process. The findings of this study will prove vital for the decision-makers or policymakers to take appropriate measures to design water budgets as well as water management plans more sustainably.

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“…Introduction. The efficiency of using isotope methods for solving hydrogeological problems has been demonstrated by a large number of studies [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Convenience of application of isotope methods comprises that the wide range of qualitative and quantitative parameters can be estimated on the basis of sufficiently small volumes of one-time sampling.…”

Section: Nas Rk Is Pleased To Announce That News Of Nas Rk Series Of ...mentioning

confidence: 99%

Features of the Isotopic Composition of Groundwater in the Mangystau Region

Absametov¹,

Itemen²,

Murtazin³

et al. 2022

SGTS

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A multi-isotopic evaluation of groundwater in a rapidly developing area and implications for water management in hyper-arid regions

Cited by 17 publications

References 45 publications

Nitrate Source and Transformation in Groundwater under Urban and Agricultural Arid Environment in the Southeastern Nile Delta, Egypt

Nitrate Source and Transformation in Groundwater under Urban and Agricultural Arid Environment in the Southeastern Nile Delta, Egypt

Recharge and Geochemical Evolution of Groundwater in Fractured Basement Aquifers (NW India): Insights from Environmental Isotopes (δ18O, δ2H, and 3H) and Hydrogeochemical Studies

Features of the Isotopic Composition of Groundwater in the Mangystau Region

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