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Recent seawater intrusion into deep aquifer determined by the radioactive noble-gas isotopes 81Kr and 39Ar

Journal Article · · Earth and Planetary Science Letters
 [1];  [2];  [3];  [4];  [5];  [6];  [4];  [7];  [8];  [2];  [9];  [10];  [3];  [3];  [11]
  1. Geological Survey of Israel, Jerusalem (Israel); Ben-Gurion Univ. (Israel)
  2. The Univ. of Chicago, Chicago, IL (United States)
  3. Hydrological Service, Jerusalem (Israel)
  4. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Science and Technology of China, Anhui (China)
  5. Univ. of Bern, Bern (Switzerland)
  6. Univ. of Bremen, Bremen (Germany)
  7. The Univ. of Chicago, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  8. Argonne National Lab. (ANL), Argonne, IL (United States)
  9. Eastern R&D Center (Israel)
  10. Ben-Gurion Univ. (Israel)
  11. Geological Survey of Israel, Jerusalem (Israel)
Radioactive noble-gas isotopes tracers 81Kr and 39Ar are used for the first time to measure the residence times of deep (~1000 m) saline coastal groundwater, and to determine its connection mode with the sea. The average rate of seawater intrusion into the deep aquifer in Israel, located near the Mediterranean Sea, is estimated. 81Kr-ages of the saline water samples, found to be younger than 40 ka, contradict previously estimated ages of up to several million years based on hydrogeological considerations. The new results imply a stronger and more recent connection between the aquifer and the sea, and indicate that the intrusion occurred during the sea-level rise that began about 20 ka ago. These coastal aquifers need to be managed with caution because lowering of the adjacent fresh water level due to over pumping could accelerate seawater intrusion in a relatively short time. As a result, this study demonstrates the suitability of these two noble-gas tracers for the examination of hydrogeological systems in general and for the study of seawater intrusion in particular.
Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1508351
Alternate ID(s):
OSTI ID: 1635857
Journal Information:
Earth and Planetary Science Letters, Journal Name: Earth and Planetary Science Letters Journal Issue: C Vol. 507; ISSN 0012-821X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

The Demographics of Water: A Review of Water Ages in the Critical Zone journal July 2019
Behaviour of Tritium and Tritiogenic Helium in Freshwater Lens Groundwater Systems: Insights from Langeoog Island, Germany journal October 2019
The Demographics of Water: A Review of Water Ages in the Critical Zone text January 2019

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