• Vladimir Lyakhovsky

  • Eyal Shalev (Stanislavsky)

  • Numerical Analysis Lab

  • Hydraulic Stimulation
  • Dissolution
  • Collapse
  • Hydrogeology

  • Biased Monitoring of Freshwater-Saltwater Mixing Zone

      In coastal aquifers, significant vertical hydraulic gradients are formed where freshwater and underlying saltwater discharge together upwards to the seafloor. Monitoring boreholes may act as "short circuits" along these vertical gradients, connecting between the higher and lower hydraulic head zones. When a sea tide is introduced, the fluctuations of both the water table and the depth of the mixing zone are also biased due to this effect. This problem is intensified in places of long screen monitoring boreholes which are common in many places in the world.

      Shalev, E., A. Lazar, S. Wollman, S. Kington, Y. Yechieli, and H. Gvirtzman, Biased Monitoring of Freshwater-Saltwater Mixing Zone in Coastal Aquifers, Ground water, 47, 49-56, 2009 (Download PDF file)

      Simulated hydraulic head, salinity, and groundwater flux in a coastal aquifer adjacent to a tidal sea. The velocity within the borehole (red arrows) is three orders of magnitude higher than in the aquifer.