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| Created: | Feb 08, 2023 at 8:36 p.m. | |
| Last updated: | Feb 08, 2023 at 8:37 p.m. | |
| Citation: | See how to cite this resource |
| Sharing Status: | Public |
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Abstract
Many of the large ground water sources in the Chalk Aquifer have adits, horizontal tunnels below the ground water table, which are connected to pumped wells. The pow in an adit may be pipe or open channel flow. Adits in the United Kingdom are normally full of water, so that the adit flow is pressurized. Darcy's formula is not applicable to the adit, and conventional ground water models are inappropriate to model the aquifer-adit system. The U.S. Geological Survey (USGS) model BRANCH simulates one-dimensional unsteady, nonuniform, multiple-branch interconnected open channel now MODBRNCH incorporates BRANCH into MODFLOW simulating open channel and aquifer interaction using deterministic responses of both systems. An aquifer-adit model can be created by two steps, First, an integrated surface-ground water model (MODBRNCH) enables open channel flow to be simulated. Second, introducing a fictitious narrow slot (Preissmann slot) above the adit allows pipe flow to be simulated by open channel flow equations. The slot does not affect the adit cross-section area, and the water level in the slot represents the pressurized adit head, which can be used by MODBRNCH to calculate the water exchange between aquifer and adit according to their head difference, The approach has been tested on the Wilmington public supply source in southeast England.
Subject Keywords
Coverage
Spatial
Content
Additional Metadata
| Name | Value |
|---|---|
| DOI | 10.1111/j.1745-6584.2000.tb00206.x |
| Depth | 120 |
| Scale | 11 - 101 km² |
| Layers | 3 |
| Purpose | Groundwater resources;Decision support |
| GroMoPo_ID | 419 |
| IsVerified | True |
| Model Code | MODFLOW;BRANCH (MODBRANCH) |
| Model Link | https://doi.org/10.1111/j.1745-6584.2000.tb00206.x |
| Model Time | SS |
| Model Year | 2000 |
| Model Authors | Zhang, BY; Lerner, DN |
| Model Country | United Kingdom |
| Data Available | Report/paper only |
| Developer Email | NA |
| Dominant Geology | Carbonate (including karst) |
| Developer Country | England |
| Publication Title | Modeling of ground water flow to adits |
| Original Developer | No |
| Additional Information | A coupled groundwater-surface water model to examine the exchange between adits and the Chalk aquifer around Wilmington, England. |
| Integration or Coupling | Surface water |
| Evaluation or Calibration | Static water levels |
| 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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