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

Content Provider	Springer Nature Link
Author	Danielsen, Jens E. Dahlin, Torleif Owen, Richard Mangeya, Pride Auken, Esben
Copyright Year	2007
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.Des investigations géophysiques et hydrogéologiques ont été menées aux alentours de Sawmills au Zimbabwe en Afrique. Celles-ci font partie d’une campagne d’investigation plus large concernant le bassin sédimentaire du Karoo, dans le cadre d’une évaluation du potentiel des eaux souterraines de cette région afin d’alimenter en eau la ville de Bulawayo. La zone de Sawmills a été sélectionnée à cause des logs de forages qui présentaient une stratigraphie favorable à la présence d’eau et des débits important mesurés lors de pompages dans ces puits. Les deux méthodes géophysiques ayant permis de collecter des données sont: la prospection électromagnétique en transitoire (TEM en anglais) et la prospection électrique verticale en continu (CVES en anglais). Les données ont également été traitées suivant l’inversion en contraintes latérales (LCI en anglais). La méthode CVES fournit plus de détails en subsurface tandis que la méthode TEM est plus efficace en profondeur; ainsi, l’utilisation combinée des deux méthodes permet une image plus précise sur tout le profil souterrain. Les résultats suggèrent que faire une LCI des données CVES et TEM, des surfaces souterraines aux profondeurs requises dans la zone de Sawmills, permet d’obtenir une image considérablement plus précise de ces zones souterraines que l’utilisation d’une de ces méthodes seule. L’interprétation hydrogéologique des données géophysiques est utile pour déterminer la profondeur et l’épaisseur du ou des horizons aquifères potentiels et pour identifier la position des zones de recharge potentielles.En los alrededores de Sawmills en Zimbabwe, Africa, se han llevado a cabo investigaciones geofísicas e hidrogeológicas. Estas investigaciones forman parte de una investigación más amplia sobre la Cuenca Sedimentaria de Karoo, para estudiar el potencial de aguas subterráneas de esta zona con vistas al suministro de agua a Bulawayo City. El área de Sawmills fue seleccionada debido a la disponibilidad de registros de sondeos que indicaban una estratigrafía favorable para la existencia de aguas subterráneas y a las altas productividades de los acuíferos medidos en estos sondeos. Se presenta aquí la toma de datos usando dos métodos geofísicos: Sistema Electromagnético Transitorio (TEM) y Sondeos Eléctricos Verticales Continuos (CVES). Los datos han sido procesados mediante Inversión lateralmente constreñida (LCI). Debido a que CVES proporciona un mayor detalle en el subsuelo poco profundo mientras que TEM es más efectivo en profundidad, se obtiene una imagen más precisa del total del subsuelo basada en el uso de los dos métodos. Los resultados sugieren que LCI de los datos de CVES y TEM es capaz de proporcionar una imagen más precisa del subsuelo en las profundidades necesarias en Sawmills que el uso de cada método por separado. La interpretación hidrogeológica de los datos geofísicos es valiosa para determinar la profundidad y el espesor de los horizontes acuíferos potenciales y para identificar la posición de las potenciales zonas de recarga.
Starting Page	945
Ending Page	960
Page Count	16
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	15
Issue Number	5
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-06-27
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Groundwater exploration Geophysical methods Karoo aquifers Joint inversion Zimbabwe Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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