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

Danielsen, Jens E.; Dahlin, Torleif LU ; Owen, Richard; Mangeya, Pride and Auken, Esben (2007) In Hydrogeology Journal 15(5). p.945-960
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Joint, Karoo aquifers, Groundwater exploration, Geophysical methods, inversion, Zimbabwe
in
Hydrogeology Journal
volume
15
issue
5
pages
945 - 960
publisher
Springer
external identifiers
  • wos:000248056700009
  • scopus:34547124341
ISSN
1431-2174
DOI
10.1007/s10040-007-0191-z
language
English
LU publication?
yes
id
d4ac9e0a-95bb-4272-bd00-314e02ea3263 (old id 645764)
date added to LUP
2007-12-10 12:13:31
date last changed
2017-07-30 03:52:10
@article{d4ac9e0a-95bb-4272-bd00-314e02ea3263,
  abstract     = {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.},
  author       = {Danielsen, Jens E. and Dahlin, Torleif and Owen, Richard and Mangeya, Pride and Auken, Esben},
  issn         = {1431-2174},
  keyword      = {Joint,Karoo aquifers,Groundwater exploration,Geophysical methods,inversion,Zimbabwe},
  language     = {eng},
  number       = {5},
  pages        = {945--960},
  publisher    = {Springer},
  series       = {Hydrogeology Journal},
  title        = {Geophysical and hydrogeologic investigation of groundwater in the Karoo stratigraphic sequence at Sawmills in northern Matabeleland, Zimbabwe: a case history},
  url          = {http://dx.doi.org/10.1007/s10040-007-0191-z},
  volume       = {15},
  year         = {2007},
}