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| Created: | Feb 07, 2023 at 6:23 p.m. | |
| Last updated: | Feb 07, 2023 at 6:24 p.m. | |
| Citation: | See how to cite this resource |
| Sharing Status: | Public |
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Abstract
Over the past few decades, seawater desalination has become a necessity for freshwater supply in many countries worldwide, particularly in arid and semi-arid regions. One potentially high-quality feed water for desalination is saline groundwater (SGW) from coastal aquifers, which has lower fouling propensity than seawater. This study examines the effect of pumping SGW from a phreatic coastal aquifer on fresh groundwater, particularly on the dynamics of the fresh-saline water interface (FSI). Initially, we constructed a 3D finite-element model of a phreatic coastal aquifer by using the FEFLOW software, which solves the coupled variable density groundwater flow and solute transport equations. Then, we compared and validated the results of the model to those of a field-scale pumping test. The model indicates that pumping SGW from a coastal aquifer freshens the aquifer and rehabilitates parts that were salinized due to seawater intrusion - an effect that increases with increasing pumping rate. In addition, when simultaneously pumping fresh groundwater further inland and SGW from below the FSI, the freshening effect is less pronounced and the salinity of the aquifer is more stable. In line with the results of the model, the field experiment revealed that salinity in the observation well decreases over the course of pumping. Taken together, our findings demonstrate that, in addition to providing a high-quality source feed water for desalination, pumping SGW does not salinize the aquifer and even rehabilitates it by negating the effect of seawater intrusion. These findings are important for planning shoreline desalination facilities and for managing arid coastal regions with lack of water supply and over exploited aquifers. (C) 2019 Published by Elsevier Ltd.
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Additional Metadata
| Name | Value |
|---|---|
| DOI | 10.1016/j.watres.2019.03.003 |
| Depth | 300 |
| Scale | < 100 km² |
| Layers | 11-15 layers |
| Purpose | groundwater resources;salt water intrusion |
| GroMoPo_ID | 73 |
| IsVerified | True |
| Model Code | Feflow |
| Model Link | https://doi.org/10.1016/j.watres.2019.03.003 |
| Model Time | SS and scenarios |
| Model Year | 2019 |
| Model Authors | Shaked Stein, Yoseph Yechieli, Eyal Shalev, Roni Kasher, Orit Sivan |
| Model Country | Israel |
| Data Available | report/paper only |
| Developer Email | yechieli@gsi.gov.il |
| Dominant Geology | unconsolidated |
| Developer Country | Israel |
| Publication Title | The effect of pumping saline groundwater for desalination on the fresh-saline water interface dynamics |
| Original Developer | No |
| Additional Information | |
| Integration or Coupling | Solute transport |
| Evaluation or Calibration | contaminant concentrations |
| Geologic Data Availability |
How to Cite
This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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