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| Type: | Resource | |
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| Created: | Feb 08, 2023 at 3:50 a.m. | |
| Last updated: | Feb 08, 2023 at 3:50 a.m. | |
| Citation: | See how to cite this resource |
| Sharing Status: | Public |
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| Views: | 530 |
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Abstract
The Nebraska Sand Hills have a unique hydrologic system with very little runoff and thick aquifers that constantly supply water to rivers, lakes, and wetlands. A ground water flow model was developed to determine the interactions between ground water and streamflow and to simulate the changes in ground water systems by reduced precipitation. The numerical modeling method includes a water balance model for the vadose zone and MODFLOW for the saturated zone. The modeling results indicated that, between 1979 and 1990, 13 percent of the annual precipitation recharged to the aquifer and annual ground water loss by evapotranspiration (ET) was only about one-fourth of this recharge. Ground water discharge to rivers accounts for about 96 percent of the streamflow in the Dismal and Middle Loup rivers. When precipitation decreased by half the average amount of the 1979 to 1990 period, the average decline of water table over the study area was 0.89 m, and the streamflow was about 87 percent of the present rate. This decline of the water table results in significant reductions in ET directly from ground water and so a significant portion of the streamflow is maintained by capture of the salvaged ET.
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Additional Metadata
| Name | Value |
|---|---|
| DOI | 10.1111/j.1752-1688.2004.tb01040.x |
| Depth | 263 |
| Scale | 11 - 101 km² |
| Layers | 2-5 layers |
| Purpose | Climate change |
| GroMoPo_ID | 182 |
| IsVerified | True |
| Model Code | MODFLOW |
| Model Link | https://doi.org/10.1111/j.1752-1688.2004.tb01040.x |
| Model Time | |
| Model Year | 2004 |
| Model Authors | X. Chen, X. Chen |
| Model Country | United States |
| Data Available | Report/paper only |
| Developer Email | xchen2@unl.edu |
| Dominant Geology | Unconsolidated sediments |
| Developer Country | USA |
| Publication Title | Simulating the effects of reduced precipitation on ground water and streamflow in the Nebraska Sand Hills |
| Original Developer | No |
| Additional Information | |
| Integration or Coupling | Surface water |
| Evaluation or Calibration | 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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