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Eyal Shalev Yossi Yechieli Haim Gvirtzman – Hebrew University, Jerusalem

Freshwater-Saltwater Mixing Zone in Coastal Aquifers: Biased vs. Reliable Monitoring. Eyal Shalev Yossi Yechieli Haim Gvirtzman – Hebrew University, Jerusalem. } – Geological Survey of Israel. Outline. Long – screened boreholes Groundwater flow in coastal aquifers Field data

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Eyal Shalev Yossi Yechieli Haim Gvirtzman – Hebrew University, Jerusalem

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  1. Freshwater-Saltwater Mixing Zone in Coastal Aquifers: Biased vs. Reliable Monitoring Eyal Shalev Yossi Yechieli Haim Gvirtzman – Hebrew University, Jerusalem } – Geological Survey of Israel

  2. Outline • Long – screened boreholes • Groundwater flow in coastal aquifers • Field data • Numerical simulations • Conclusions

  3. Hydraulic Head Interface Interface

  4. Elci et al., 2003

  5. Molz et al., 1994

  6. Britt, 2005

  7. Konokow and Hornberger, 2006

  8. Konokow and Hornberger, 2006

  9. T/143-3 T/143-4 41.56 81.56 31.57 34.44 73.13 116.00

  10. South Korea Kim et al., 2005 J. Hydrology

  11. Kim et al., 2005 J. Hydrology

  12. Kim et al., 2005 J. Hydrology

  13. Jeju Island Kim et al., 2006 J. Hydrology

  14. 350 ft = 106.7 m 142 ft = 43.3 m 205 ft = 62.5 m Priest, S., 2004, USGS Scientific Investigations Report 2004-5265

  15. anisotropy 1:30

  16. anisotropic anisotropic

  17. anisotropy 1:30

  18. Conclusions • Observations monitored in long-screen boreholes do not • accurately represent natural phenomena • Boreholes may act as a “short circuit” along a vertical • gradient, connecting between the higher and lower • hydraulic head zones • This is shown to occur in coastal aquifers both in steady • state and transient (tide) conditions • In steady state conditions, the borehole interference is • higher for the anisotropic case

  19. Conclusions (continued) • When tides are introduced, the high amplitude of the • freshwater-saltwater mixing zone occurs only in the • borehole. • In the aquifer, the freshwater-saltwater mixing zone • fluctuations are dampened, and tens of meters inland • from the shoreline the fluctuations are in the order of • few centimeters. • Groundwater flow directions are affected by tides to a • large distance from the shoreline.

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