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| Created: | Feb 07, 2023 at 2:31 p.m. | |
| Last updated: | Feb 07, 2023 at 2:31 p.m. | |
| Citation: | See how to cite this resource |
| Sharing Status: | Public |
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| Views: | 607 |
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Abstract
The Guarani Aquifer System (GAS) is a strategic transboundary aquifer system shared by Brazil, Argentina, Paraguay and Uruguay. This article presents a groundwater flow model to assess the GAS system in terms of regional flow patterns, water balance and overall recharge. Despite the continental dimension of GAS, groundwater recharge is restricted to narrow outcrop zones. An important part is discharged into local watersheds, whereas a minor amount reaches the confined part. A three-dimensional finite element groundwater-flow model of the entire GAS system was constructed to obtain a better understanding of the prevailing flow dynamics and more reliable estimates of groundwater recharge. Our results show that recharge rates effectively contributing to the regional GAS water balance are only approximately 0.6 km(3)/year (about 4.9 mm/year). These rates are much smaller than previous estimates, including of deep recharge approximations commonly used for water resources management. Higher recharge rates were also not compatible with known(81)Kr groundwater age estimates, as well as with calculated residence times using a particle tracking algorithm.
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Additional Metadata
| Name | Value |
|---|---|
| DOI | 10.3390/w12092323 |
| Depth | 1200 |
| Scale | 1.2 million km2 |
| Layers | 2-5 layers |
| Purpose | groundwater resources;regional flow patterns, water balance and overall recharge |
| GroMoPo_ID | 50 |
| IsVerified | True |
| Model Code | Feflow |
| Model Link | https://doi.org/10.3390/w12092323 |
| Model Time | steady state flow regime |
| Model Year | 2020 |
| Model Authors | R. Gonçalves 1 , E. Teramoto 2, H. Chang 3 |
| Model Country | Brazil, Argentina, Paraguay, Uruguay |
| Data Available | report/paper only |
| Developer Email | chang.hung-kiang@unesp.br |
| Dominant Geology | volcanic |
| Developer Country | Brasil |
| Publication Title | Regional Groundwater Modeling of the Guarani Aquifer System |
| Original Developer | No |
| Additional Information | The Guarani Aquifer System (GAS) is a strategic transboundary aquifer system shared by Brazil, Argentina, Paraguay and Uruguay. This article presents a groundwater flow model to assess the GAS system in terms of regional flow patterns, water balance and overall recharge. Despite the continental dimension of GAS, groundwater recharge is restricted to narrow outcrop zones. An important part is discharged into local watersheds, whereas a minor amount reaches the confined part. A three-dimensional finite element groundwater-flow model of the entire GAS system was constructed to obtain a better understanding of the prevailing flow dynamics and more reliable estimates of groundwater recharge. Our results show that recharge rates effectively contributing to the regional GAS water balance are only approximately 0.6 km3/year (about 4.9 mm/year). These rates are much smaller than previous estimates, including of deep recharge approximations commonly used for water resources management. Higher recharge rates were also not compatible with known 81Kr groundwater age estimates, as well as with calculated residence times using a particle tracking algorithm. |
| Integration or Coupling | None of the above |
| 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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