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GroMoPo Metadata for Great Maputo aquifer model


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Created: Feb 06, 2023 at 9:06 p.m.
Last updated: Feb 06, 2023 at 9:06 p.m.
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Abstract

Regional three-dimensional groundwater-flow and saltwater transport models were built to analyse saltwater intrusion in the Great Maputo area, southern Mozambique. Increased water demand has led to many private groundwater abstractions, as the local public water supply network has already reached maximum capacity. Pushing for new strategies to tackle the water-supply shortages exposes the aquifer system to saltwater intrusion from entrapped fossil saline groundwater and seawater. Previous attempts at modelling have been frustrated by data limitations. This study compiled all the available data to build the models, which were subsequently calibrated with observed heads, discharges and salt concentrations. The transport models were used to test hypotheses of potential sources of saltwater resulting in the current salinity distribution. Furthermore, scenarios were simulated to assess the impacts of sea-level rise and projected groundwater abstractions. Results show that saline groundwater is widely distributed in the aquifer's western sector, where it is a limiting factor for groundwater development, and seawater intrusion is a risk along the coastline. Newly constructed wells (46) along the Infulene River can be operated with some impacts of saltwater upconing and must be closely monitored. Although current groundwater abstractions (60,340 m(3)/day) are still small compared with groundwater recharge (980,823 m(3)/day), larger volumes of abstraction are feasible only when using a high number of production wells further away from the city with relatively low yields to avoid saltwater upconing. Capture of fresh groundwater upstream of discharge areas by wells for water supply is possible while maintaining groundwater discharges for groundwater dependent ecosystems.

Subject Keywords

Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
Mozambique
North Latitude
-25.0400°
East Longitude
33.1000°
South Latitude
-26.0400°
West Longitude
32.2100°

Content

Additional Metadata

Name Value
DOI 10.1007/s10040-019-02053-5
Depth -40
Scale < 10 000 km²
Layers 2-5 layers
Purpose groundwater resources;salt water intrusion
GroMoPo_ID 30
IsVerified True
Model Code SEAWAT
Model Link https://doi.org/10.1007/s10040-019-02053-5
Model Time SS and 2017-2066
Model Year 2019
Model Authors Alberto Casillas-Trasvina, Yangxiao Zhou, Tibor Y. Stigter, F. E. F. Mussáa, D. Juízo
Model Country Mozambique
Data Available report/paper only;Geological input available;Cross-section provided in the article
Developer Email JesusAlberto.CasillasTrasvina@ugent.be
Dominant Geology unconsolidated
Developer Country Belgium
Publication Title Application of numerical models to assess multi-source saltwater intrusion under natural and pumping conditions in the Great Maputo aquifer, Mozambique
Original Developer No
Additional Information
Integration or Coupling Solute transport
Evaluation or Calibration contaminant concentrations
Geologic Data Availability

How to Cite

GroMoPo, D. Zamrsky (2023). GroMoPo Metadata for Great Maputo aquifer model, HydroShare, http://www.hydroshare.org/resource/91041d43aca14c32844f5dbd582ea214

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

http://creativecommons.org/licenses/by/4.0/
CC-BY

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