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| Type: | Resource | |
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| Created: | Feb 08, 2023 at 7:44 p.m. | |
| Last updated: | Feb 08, 2023 at 7:44 p.m. | |
| Citation: | See how to cite this resource |
| Sharing Status: | Public |
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| Views: | 569 |
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Abstract
The calibration of a groundwater model with the aid of hydrochemical data has demonstrated that low recharge rates in the Middle Rio Grande Basin may be responsible for a groundwater trough in the center of the basin and for a substantial amount of Rio Grande water in the regional flow system. Earlier models of the basin had difficulty reproducing these features without any hydrochemical data to constrain the rates and distribution of recharge. The objective of this study was to use the large quantity of available hydrochemical data to help calibrate the model parameters, including the recharge rates. The model was constructed using the US Geological Survey's software MODFLOW, MODPATH, and UCODE, and calibrated using C-14 activities and the positions of certain flow zones defined by the hydrochemical data. Parameter estimation was performed using a combination of nonlinear regression techniques and a manual search for the minimum difference between field and simulated observations. The calibrated recharge values were substantially smaller than those used in previous models. Results from a 30,000-year transient simulation suggest that recharge was at a maximum about 20,000 years ago and at a minimum about 10,000 years ago.
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Additional Metadata
| Name | Value |
|---|---|
| DOI | 10.1007/s10040-004-0326-4 |
| Depth | 4400 |
| Scale | 10 001 - 100 000 km² |
| Layers | 9 |
| Purpose | Scientific investigation (not related to applied problem) |
| GroMoPo_ID | 382 |
| IsVerified | True |
| Model Code | MODFLOW |
| Model Link | https://doi.org/10.1007/s10040-004-0326-4 |
| Model Time | |
| Model Year | 2004 |
| Model Authors | Sanford, WE; Plummer, LN; McAda, DP; Bexfield, LM; Anderholm, SK |
| Model Country | United States |
| Data Available | Report/paper only |
| Developer Email | wsanford@usgs.gov |
| Dominant Geology | |
| Developer Country | VA USA; USA |
| Publication Title | Hydrochemical tracers in the middle Rio Grande Basin, USA: 2. Calibration of a groundwater-flow model |
| Original Developer | No |
| Additional Information | |
| Integration or Coupling | Tracer transport |
| Evaluation or Calibration | Groundwater chemistry |
| 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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