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| Created: | Feb 08, 2023 at 4:18 a.m. | |
| Last updated: | Feb 08, 2023 at 4:18 a.m. | |
| Citation: | See how to cite this resource |
| Sharing Status: | Public |
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Abstract
The feasibility of a hydrogeological modeling approach to simulate several thousand shallow groundwater-fed lakes and wetlands without explicitly considering their connection with groundwater is investigated at the regional scale (similar to 40,000 km(2)) through an application in the semi-arid Nebraska Sand Hills (NSH), USA. Hydraulic heads are compared to local land-surface elevations from a digital elevation model (DEM) within a geographic information system to assess locations of lakes and wetlands. The water bodies are inferred where hydraulic heads exceed, or are above a certain depth below, the land surface. Numbers of lakes and/or wetlands are determined via image cluster analysis applied to the same 30-m grid as the DEM after interpolating both simulated and estimated heads. The regional water-table map was used for groundwater model calibration, considering MODIS-based net groundwater recharge data. Resulting values of simulated total baseflow to interior streams are within 1% of observed values. Locations, areas, and numbers of simulated lakes and wetlands are compared with Landsat 2005 survey data and with areas of lakes from a 1979-1980 Landsat survey and the National Hydrography Dataset. This simplified process-based modeling approach avoids the need for field-based morphology or water-budget data from individual lakes or wetlands, or determination of lake-groundwater exchanges, yet it reproduces observed lake-wetland characteristics at regional groundwater management scales. A better understanding of the NSH hydrogeology is attained, and the approach shows promise for use in simulations of groundwater-fed lake and wetland characteristics in other large groundwater systems.
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Additional Metadata
| Name | Value |
|---|---|
| DOI | 10.1007/s10040-017-1691-0 |
| Depth | |
| Scale | 10 001 - 100 000 km² |
| Layers | 1 |
| Purpose | Groundwater resources |
| GroMoPo_ID | 194 |
| IsVerified | True |
| Model Code | MODFLOW |
| Model Link | https://doi.org/10.1007/s10040-017-1691-0 |
| Model Time | |
| Model Year | 2018 |
| Model Authors | Rossman, NR; Zlotnik, VA; Rowe, CM |
| Model Country | United States |
| Data Available | Report/paper only |
| Developer Email | nrossman@huskers.unl.edu |
| Dominant Geology | Model focuses on multiple geologic materials |
| Developer Country | USA |
| Publication Title | An approach to hydrogeological modeling of a large system of groundwater-fed lakes and wetlands in the Nebraska Sand Hills, USA |
| Original Developer | No |
| Additional Information | |
| 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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