Determination of the origins and recharge rates of the Sfax aquifer system (southeastern Tunisia) using isotope tracers

Rahma Ayadi, Kamel Zouari, Hakim Saibi, Rim Trabelsi, Hafedh Khanfir, Ryuichi Itoi

研究成果: ジャーナルへの寄稿記事

5 引用 (Scopus)

抄録

The origin of groundwater in the Sfax aquifer system was studied using environmental isotopic tracers (δ18O, δ2H, and 3H). In total, 164 water samples were analyzed for stable isotopes: 73 collected from the Sfax shallow aquifer, 63 from the Sfax middle aquifer, and 28 from the Sfax deep aquifer. Recent recharge of the groundwater in the Sfax aquifer was identified using tritium concentrations in 82 groundwater samples from different depths. The isotopic ratios of the shallow aquifer range from −5.55 to −1.59 ‰ for δ18O and from −38.38 to −14.19 ‰ for δ2H, and the isotopic ratios in the middle aquifer range from −6.86 to −2.97 ‰ for δ18O and from −44.18 to −22.38 ‰ for δ2H. The deep aquifer exhibited markedly lower isotopic values, ranging from −6.70 to −5.70 ‰ for δ18O and from −42.40 to −38.89 ‰ for δ2H. The mixing proportions inferred from stable isotopic mass balance calculations suggest that the deep aquifer contributes significantly to the middle aquifer through geologic structures and may reach 100 % in the Menzel Chaker region. The isotopic mass balance model also indicates that the middle groundwater aquifer may contribute up to 100 % of the shallow Plio-Quaternary aquifer, particularly in the western and northeastern parts of the study area, between Bir Ali ben Khalifa and Djebeniana. The tritium data support the existence of recent recharge. The tritium and stable isotope data clearly indicate the presence of mixing processes, especially in the northwestern and coastal portions of the study area. A conceptual model is established, explaining the pressure differences that generate vertical leakage, which is a reasonable mechanism for flow between the aquifers.

元の言語英語
記事番号636
ジャーナルEnvironmental Earth Sciences
75
発行部数8
DOI
出版物ステータス出版済み - 4 1 2016

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Radioactive tracers
isotope labeling
Tunisia
Aquifers
Isotopes
aquifers
recharge
tracer
aquifer
isotope
tritium
Tritium
Groundwater
groundwater
isotopic ratio
rate
stable isotopes
mass balance
stable isotope
groundwater recharge

All Science Journal Classification (ASJC) codes

  • Global and Planetary Change
  • Environmental Chemistry
  • Water Science and Technology
  • Soil Science
  • Pollution
  • Geology
  • Earth-Surface Processes

これを引用

Determination of the origins and recharge rates of the Sfax aquifer system (southeastern Tunisia) using isotope tracers. / Ayadi, Rahma; Zouari, Kamel; Saibi, Hakim; Trabelsi, Rim; Khanfir, Hafedh; Itoi, Ryuichi.

:: Environmental Earth Sciences, 巻 75, 番号 8, 636, 01.04.2016.

研究成果: ジャーナルへの寄稿記事

Ayadi, Rahma ; Zouari, Kamel ; Saibi, Hakim ; Trabelsi, Rim ; Khanfir, Hafedh ; Itoi, Ryuichi. / Determination of the origins and recharge rates of the Sfax aquifer system (southeastern Tunisia) using isotope tracers. :: Environmental Earth Sciences. 2016 ; 巻 75, 番号 8.
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abstract = "The origin of groundwater in the Sfax aquifer system was studied using environmental isotopic tracers (δ18O, δ2H, and 3H). In total, 164 water samples were analyzed for stable isotopes: 73 collected from the Sfax shallow aquifer, 63 from the Sfax middle aquifer, and 28 from the Sfax deep aquifer. Recent recharge of the groundwater in the Sfax aquifer was identified using tritium concentrations in 82 groundwater samples from different depths. The isotopic ratios of the shallow aquifer range from −5.55 to −1.59 ‰ for δ18O and from −38.38 to −14.19 ‰ for δ2H, and the isotopic ratios in the middle aquifer range from −6.86 to −2.97 ‰ for δ18O and from −44.18 to −22.38 ‰ for δ2H. The deep aquifer exhibited markedly lower isotopic values, ranging from −6.70 to −5.70 ‰ for δ18O and from −42.40 to −38.89 ‰ for δ2H. The mixing proportions inferred from stable isotopic mass balance calculations suggest that the deep aquifer contributes significantly to the middle aquifer through geologic structures and may reach 100 {\%} in the Menzel Chaker region. The isotopic mass balance model also indicates that the middle groundwater aquifer may contribute up to 100 {\%} of the shallow Plio-Quaternary aquifer, particularly in the western and northeastern parts of the study area, between Bir Ali ben Khalifa and Djebeniana. The tritium data support the existence of recent recharge. The tritium and stable isotope data clearly indicate the presence of mixing processes, especially in the northwestern and coastal portions of the study area. A conceptual model is established, explaining the pressure differences that generate vertical leakage, which is a reasonable mechanism for flow between the aquifers.",
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AU - Khanfir, Hafedh

AU - Itoi, Ryuichi

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AB - The origin of groundwater in the Sfax aquifer system was studied using environmental isotopic tracers (δ18O, δ2H, and 3H). In total, 164 water samples were analyzed for stable isotopes: 73 collected from the Sfax shallow aquifer, 63 from the Sfax middle aquifer, and 28 from the Sfax deep aquifer. Recent recharge of the groundwater in the Sfax aquifer was identified using tritium concentrations in 82 groundwater samples from different depths. The isotopic ratios of the shallow aquifer range from −5.55 to −1.59 ‰ for δ18O and from −38.38 to −14.19 ‰ for δ2H, and the isotopic ratios in the middle aquifer range from −6.86 to −2.97 ‰ for δ18O and from −44.18 to −22.38 ‰ for δ2H. The deep aquifer exhibited markedly lower isotopic values, ranging from −6.70 to −5.70 ‰ for δ18O and from −42.40 to −38.89 ‰ for δ2H. The mixing proportions inferred from stable isotopic mass balance calculations suggest that the deep aquifer contributes significantly to the middle aquifer through geologic structures and may reach 100 % in the Menzel Chaker region. The isotopic mass balance model also indicates that the middle groundwater aquifer may contribute up to 100 % of the shallow Plio-Quaternary aquifer, particularly in the western and northeastern parts of the study area, between Bir Ali ben Khalifa and Djebeniana. The tritium data support the existence of recent recharge. The tritium and stable isotope data clearly indicate the presence of mixing processes, especially in the northwestern and coastal portions of the study area. A conceptual model is established, explaining the pressure differences that generate vertical leakage, which is a reasonable mechanism for flow between the aquifers.

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