GroMoPo Metadata for Atlantis aquifer MODFLOW model

Authors:

GroMoPo Andres Quichimbo

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gromopo_admin

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Resource

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The size of this resource is 1.9 KB

Created:

Feb 07, 2023 at 6:06 p.m.

Last updated:

Feb 07, 2023 at 6:07 p.m.

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Abstract

The Atlantis Water Supply Scheme (AWSS, Western Cape, South Africa) has been in operation for about 40 years as a means to supply and augment drinking water to the town of Atlantis via managed aquifer recharge (MAR). In this study, the numerical model MODFLOW for groundwater flow and contaminant transport was used in support of the management of the AWSS. The aims were: (i) to calibrate the MODFLOW model for the MAR site at Atlantis; (ii) to run realistic scenarios that cannot be replicated through experiments; and (iii) to make recommendations in support of efficient and sustainable management of the aquifer. MODFLOW was calibrated through comparison of observed and simulated groundwater levels (R-2 between 0.663 and 0.995). Scenario simulations indicated possible drawdowns between < 5 m (low groundwater abstraction and low artificial recharge of groundwater through infiltration basins) and > 20 m (high abstraction and high artificial recharge) at localized areas of the Witzand wellfield. At Silwerstroom, large drawdown levels were not predicted to occur, so this wellfield could be exploited more without affecting the sustainability of the groundwater resource. Groundwater moves from the infiltration basins towards the Witzand wellfield at a rate of 120-150 m.a(-1). The modelling results supported recommendations for balancing groundwater abstraction and artificial recharge volumes, monitoring the water balance components of the system, the potential risks of groundwater contamination and the delineation of groundwater protection zones.

Subject Keywords

Coverage

Spatial

Coordinate System/Geographic Projection:

WGS 84 EPSG:4326

Coordinate Units:

Decimal degrees

Place/Area Name:

South Africa

North Latitude

-33.5073°

East Longitude

18.5398°

South Latitude

-33.6673°

West Longitude

18.3374°

Streets Terrain Satelite

Spatial Extent

Content

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Additional Metadata

Name	Value
DOI	10.4314/wsa.v43i1.15
Depth	50
Scale	< 100 kmÂ²
Layers	1 layer
Purpose	groundwater resources
GroMoPo_ID	61
IsVerified	True
Model Code	MODFLOW
Model Link	https://doi.org/10.4314/wsa.v43i1.15
Model Time	1993-2011
Model Year	2017
Model Authors	Nebo Jovanovic, Richard DH Bugan, Gideon Tredoux, Sumaya Israel, Rodney Bishop, Vernon Marinus
Model Country	South Africa
Data Available	report/paper only
Developer Email	njovanovic@csir.co.za
Dominant Geology	siliciclastic sedimentary (sandstones, shales)
Developer Country	South Africa
Publication Title	Hydrogeological modelling of the Atlantis aquifer for management support to the Atlantis Water Supply Scheme
Original Developer	No
Additional Information
Integration or Coupling	None of the above
Evaluation or Calibration	dynamic water levels
Geologic Data Availability

How to Cite

GroMoPo, A. Quichimbo (2023). GroMoPo Metadata for Atlantis aquifer MODFLOW model, HydroShare, http://www.hydroshare.org/resource/2d9065419d6644978e25ae9233f354d6

This resource is shared under the Creative Commons Attribution CC BY.

http://creativecommons.org/licenses/by/4.0/

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