Interchange of Infiltrating and Resident Water in Partially Saturated Media

Conference paper
Part of the NATO Science for Peace and Security Series C: Environmental Security book series (NAPSC)

Abstract

The interplay between resident water (“old water”) and infiltrating water (“new water”) in porous media is examined through experiments in an idealized 2D glass micromodel. The analysis is motivated by the recognition that two complementary processes occur as water migrates through the vadose zone: infiltration, when water advances downward through this zone, and drainage, which follows infiltration events (precipitation and irrigation) when air displaces water as the water migrates deeper into the subsurface. Residual water saturation after a cycle of drainage is controlled by pores and pore clusters that retain “old water”. During an infiltration cycle, “new water” flowing through the porous medium will intermittently connect to these clusters and then will leave a new pattern of disconnected clusters containing, presumably, both old and new water. In the micromodel experiments, image analysis is used to quantify the miscible interplay between old and new water over a cycle of imbibition by new water and drainage by air in a domain that is partially saturated with old water. We demonstrate that some old water remains in the system at long times within stable water pockets; these pockets may remain stable even after a second cycle of infiltration. An implication of this finding is that water scarcity under dry climate conditions may increase the influence of mixing of infiltrating and resident water on water quality, particularly in the uppermost aquifer layers.

Keywords

Pore Space Vadose Zone Water Injection Volumetric Fraction Pore Scale 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgement

Maxime Gouet-Kaplan is thanked for performing the experiments.

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.Department of Environmental Sciences and Energy ResearchWeizmann Institute of ScienceRehovotIsrael

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