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| Created: | Feb 07, 2023 at 2:28 p.m. | |
| Last updated: | Feb 07, 2023 at 2:28 p.m. | |
| Citation: | See how to cite this resource |
| Sharing Status: | Public |
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| Views: | 381 |
| Downloads: | 187 |
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Abstract
Tunisia relies extensively on coastal groundwater resources that are pumped at unsustainable rates to support irrigated agriculture, causing groundwater drawdown and water quality problems due to seawater intrusion. It is imperative for the country to regulate future groundwater allocations and implement conservation strategies based on robust hydrogeological assessments to alleviate the adverse impacts of groundwater depletion. We developed a 3D transient density-dependent groundwater model by coupling MODFLOW-2000 and MT3DMS to improve understanding of seawater intrusion into the Korba aquifer in Tunisia. Results indicate that groundwater overexploitation since 1965 induced 5.15 Mm(3)/year of seawater inflow while reducing submarine discharge into the sea by about 9.74 Mm(3)/year as compared to the steady state water budget in 1965. Projecting withdrawals from 2014 up to 2050 results in a slow but extensive groundwater table decline forming a cone of depression 15 m below sea level. The seawater wedge under this business-as-usual scenario is expected to reach 1.8 km from the shoreline, causing significant mixing of the TDS-rich seawater in the aquifer system. The cone of depression under a 25% increase in groundwater withdrawal drops to about 20 m below sea level while the saltwater front reaches 2.5 km inland. Countering the seawater intrusion problem requires reducing groundwater pumping by 17 Mm(3)/year to push back the saltwater front along the coastline by about 25% over a 43-year period. Application of the presented generic groundwater simulation framework guides developing management strategies to mitigate seawater intrusion in the Korba coastal aquifer and similar areas.
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Additional Metadata
| Name | Value |
|---|---|
| DOI | 10.1007/s10661-019-7866-5 |
| Depth | 200 |
| Scale | < 1000 km² |
| Layers | 2-5 layers |
| Purpose | groundwater resources;salt water intrusion |
| GroMoPo_ID | 48 |
| IsVerified | True |
| Model Code | MODFLOW + MT3DMS |
| Model Link | https://doi.org/10.1007/s10661-019-7866-5 |
| Model Time | 1965-2050 |
| Model Year | 2019 |
| Model Authors | Adel Zghibi, Ali Mirchi, Lahcen Zouhri, Jean-Denis Taupin, Anis Chekirbane, Jamila Tarhouni |
| Model Country | Tunisia |
| Data Available | report/paper only;Geological input available;Geological cross-section available, not further details |
| Developer Email | adelzguibi@yahoo.fr |
| Dominant Geology | unconsolidated |
| Developer Country | Tunisia |
| Publication Title | Implications of groundwater development and seawater intrusion for sustainability of a Mediterranean coastal aquifer in Tunisia |
| Original Developer | No |
| Additional Information | |
| Integration or Coupling | Solute transport |
| Evaluation or Calibration | static water levels;dynamic water levels |
| 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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