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| Created: | Feb 08, 2023 at 3:28 p.m. | |
| Last updated: | Feb 08, 2023 at 3:28 p.m. | |
| Citation: | See how to cite this resource |
| Sharing Status: | Public |
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Abstract
Reliable ground water models require both an accurate physical representation of the system and appropriate boundary conditions. While physical attributes are generally considered static, boundary conditions, such as ground water recharge rates, can be highly variable in both space and time. A practical methodology incorporating the hydrologic model HELP3 in conjunction with a geographic information system was developed to generate a physically based and highly detailed recharge boundary condition for ground water modeling. The approach uses daily precipitation and temperature records in addition to land use/land cover and soils data. The importance of the method in transient ground water modeling is demonstrated by applying it to a MODFLOW modeling study in New Jersey. In addition to improved model calibration, the results from the study clearly indicate the importance of using a physically based and highly detailed recharge boundary condition in ground water quality modeling, where the detailed knowledge of the evolution of the ground water flowpaths is imperative. The simulated water table is within 0.5 m of the observed values using the method, while the water levels can differ by as much as 2 m using uniform recharge conditions. The results also show that the combination of temperature and precipitation plays an important role in the amount and timing of recharge in cooler climates. A sensitivity analysis further reveals that increasing the leaf area index, the evaporative zone depth, or the curve number in the model will result in decreased recharge rates over time, with the curve number having the greatest impact.
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Additional Metadata
| Name | Value |
|---|---|
| DOI | 10.1111/j.1745-6584.2002.tb02550.x |
| Depth | |
| Scale | 101 - 1 000 km² |
| Layers | 4 |
| Purpose | Groundwater resources;Scientific investigation (not related to applied problem);Agricultural growth |
| GroMoPo_ID | 311 |
| IsVerified | True |
| Model Code | MODFLOW;HELP3, SNOW-17, CREAMS, |
| Model Link | https://doi.org/10.1111/j.1745-6584.2002.tb02550.x |
| Model Time | 1970-2000 |
| Model Year | 2002 |
| Model Authors | Jyrkama, MI; Sykes, JF; Normani, SD |
| Model Country | United States |
| Data Available | Report/paper only |
| Developer Email | NA |
| Dominant Geology | Unsure |
| Developer Country | Canada |
| Publication Title | Recharge estimation for transient ground water modeling |
| Original Developer | No |
| Additional Information | |
| Integration or Coupling | Surface water;Land surface model’ |
| Evaluation or Calibration | Unsure |
| Geologic Data Availability | No |
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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