Identifying watershed-scale groundwater flow barriers: The Yoqne'am Fault in Israel

Elad Dafny*, Haim Gvirtzman, Avihu Burg

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Geological faults may serve either as groundwater conduits or barriers, depending on their hydraulic properties. Determining fault characteristics is therefore important when deciding inputs for numerical models developed for watershed-scale groundwater studies. Cutting-edge methods for determining fault characteristics have been widely applied for oil and gas reservoir characterization purposes, whereas water-resource studies simply use a priori values. This study evaluates the hydraulic properties of the Yoqne'am Fault (YF) in northern Israel, which impacts groundwater flow within the Judea Group Aquifer (JGA). The YF has a vertical throw of several hundred to one thousand meters accompanied by pronounced lateral throw. Detailed examination of hydrological and geochemical data from nearby wells, structural maps and numerical modeling results, suggests that the YF acts as a semi-impermeable feature with a hydraulic conductivity of less than 4 × 10e-2 m/d. The YF hydraulic conductivity is four orders of magnitude below that of the surrounding Judea Group rocks, and only a limited volume of water can leak through the fault. For that reason, it is concluded that the YF acts as a boundary between two large groundwater basins.

Original languageAmerican English
Pages (from-to)1035-1051
Number of pages17
JournalHydrogeology Journal
Volume21
Issue number5
DOIs
StatePublished - Aug 2013

Bibliographical note

Funding Information:
This work was funded by the Israel Water Authority (IWA). The authors thank Prof. John Worden and Dr. Dani Kurtzman for their constructive comments which led to the improvement of this manuscript, and Dr. Yossi Guttman for provision of well data.

Keywords

  • Fault
  • Hydraulic properties
  • Israel
  • Judea Group Aquifer
  • Numerical modeling

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