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| Created: | Feb 08, 2023 at 2:51 a.m. | |
| Last updated: | Feb 08, 2023 at 2:51 a.m. | |
| Citation: | See how to cite this resource |
| Sharing Status: | Public |
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Abstract
The cities of Rivera and Santana do Livramento are located on the outcropping area of the sandstone Guarani Aquifer on the Brazil-Uruguay border, where the aquifer is being increasingly exploited. Therefore, recharge estimates are needed to address sustainability. First, a conceptual model of the area was developed. A multilayer, heterogeneous and anisotropic groundwater-flow model was built to validate the conceptual model and to estimate recharge. A field campaign was conducted to collect water samples and monitor water levels used for model calibration. Field data revealed that there exists vertical gradients between confining basalts and underlying sandstones, suggesting basalts could indirectly recharge sandstone in fractured areas. Simulated downward flow between them was a small amount within the global water budget. Calibrated recharge rates over basalts and over outcropping sandstones were 1.3 and 8.1% of mean annual precipitation, respectively. A big portion of sandstone recharge would be drained by streams. The application of a water balance yielded a recharge of 8.5% of average annual precipitation. The numerical model and the water balance yielded similar recharge values consistent with determinations from previous authors in the area and other regions of the aquifer, providing an upper bound for recharge in this transboundary aquifer.
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Additional Metadata
| Name | Value |
|---|---|
| DOI | 10.1007/s10040-010-0630-0 |
| Depth | 350 |
| Scale | 101 - 1 000 km² |
| Layers | 2-5 layers |
| Purpose | Groundwater resources |
| GroMoPo_ID | 141 |
| IsVerified | True |
| Model Code | MODFLOW |
| Model Link | https://doi.org/10.1007/s10040-010-0630-0 |
| Model Time | SS |
| Model Year | 2010 |
| Model Authors | A. Gomez, L. B. RodrÃguez, L. S. Vives |
| Model Country | Brazil, Uruguay |
| Data Available | Report/paper only |
| Developer Email | aagomez@fich1.unl.edu.ar |
| Dominant Geology | Model focuses on multiple geologic materials |
| Developer Country | Argentina |
| Publication Title | The Guarani Aquifer System: estimation of recharge along the Uruguay-Brazil border |
| Original Developer | No |
| Additional Information | The cities of Rivera and Santana do Livramento are located on the outcropping area of the sandstone Guarani Aquifer on the Brazil–Uruguay border, where the aquifer is being increasingly exploited. Therefore, recharge estimates are needed to address sustainability. First, a conceptual model of the area was developed. A multilayer, heterogeneous and anisotropic groundwater-flow model was built to validate the conceptual model and to estimate recharge. A field campaign was conducted to collect water samples and monitor water levels used for model calibration. Field data revealed that there exists vertical gradients between confining basalts and underlying sandstones, suggesting basalts could indirectly recharge sandstone in fractured areas. Simulated downward flow between them was a small amount within the global water budget. Calibrated recharge rates over basalts and over outcropping sandstones were 1.3 and 8.1% of mean annual precipitation, respectively. A big portion of sandstone recharge would be drained by streams. The application of a water balance yielded a recharge of 8.5% of average annual precipitation. The numerical model and the water balance yielded similar recharge values consistent with determinations from previous authors in the area and other regions of the aquifer, providing an upper bound for recharge in this transboundary aquifer. |
| Integration or Coupling | |
| Evaluation or Calibration | Static 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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