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Geophysical and hydrogeologic investigation of groundwater in the Karoo stratigraphic sequence at Sawmills in northern Matabeleland, Zimbabwe: a case history

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Author

  • Jens E. Danielsen
  • Torleif Dahlin
  • Richard Owen
  • Pride Mangeya
  • Esben Auken

Summary, in English

Geophysical and hydrogeological investigations have been carried out around Sawmills in Zimbabwe, Africa. The investigations are components of a larger investigation to assess the groundwater potential of the Karoo sedimentary basin with regards to supplying water to Bulawayo City. The Sawmills area was selected due to the availability of borehole logs indicating favourable stratigraphy for groundwater availability and due to the high yields from the aquifers measured from these boreholes. Data collected using two geophysical methods are presented here: transient electromagnetic (TEM) and continuous vertical electrical sounding (CVES) data. The data have also been processed using laterally constrained inversion (LCI). Because the CVES provides greater detail in the shallow subsurface, whereas TEM is more effective at depth, a more accurate image of the entire subsurface profile is provided based on using both methods. The results suggest that LCI of CVES and TEM data, in the subsurface at the required depths at Sawmills, is able to provide a substantially more accurate image of the subsurface than either method alone. The hydrogeological interpretation of the geophysical data is valuable for determining the depth to and thickness of the potential aquifer horizon(s) and for identifying the position of potential recharge zones.

Publishing year

2007

Language

English

Pages

945-960

Publication/Series

Hydrogeology Journal

Volume

15

Issue

5

Document type

Journal article

Publisher

Springer

Topic

  • Geotechnical Engineering

Keywords

  • Joint
  • Karoo aquifers
  • Groundwater exploration
  • Geophysical methods
  • inversion
  • Zimbabwe

Status

Published

ISBN/ISSN/Other

  • ISSN: 1431-2174