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

In English

Författare

  • 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.

Avdelning/ar

Publiceringsår

2007

Språk

Engelska

Sidor

945-960

Publikation/Tidskrift/Serie

Hydrogeology Journal

Volym

15

Issue

5

Dokumenttyp

Artikel i tidskrift

Förlag

Springer

Ämne

  • Geotechnical Engineering

Nyckelord

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

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1431-2174