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Accueil du site → Master → Afrique du Sud → 2019 → Characterisation of the deep aquifers of South Africa - the bushveld igneous complex, crystalline basement rocks and dolomite formations

University of the Free State (2019)

Characterisation of the deep aquifers of South Africa - the bushveld igneous complex, crystalline basement rocks and dolomite formations

Govender, Nishen

Titre : Characterisation of the deep aquifers of South Africa - the bushveld igneous complex, crystalline basement rocks and dolomite formations

Auteur : Govender, Nishen

Université de soutenance : University of the Free State

Grade : Magister Scientiae in Geohydrology 2019

Résumé partiel
During periods of drought, as South Africa has experienced recently, groundwater boreholes are explored to identify alternative sources of water. However, much emphasis is placed on the shallow groundwater system with minimal information available on the deep aquifer system. The aim of this dissertation is to identify potential deep aquifer systems in South Africa and characterise their potential as potable water sources. This dissertation concentrates on three types of aquifer systems, the crystalline basement aquifers, Bushveld Igneous Complex and dolomite aquifers. In order to characterise deep aquifer systems, an understanding of basic hydrogeological terminology and characteristics of the shallow aquifer system need to be devised first. The methodology that is required is 1) to determine the defining depth between shallow and deep aquifer systems, 2) identify possible deep aquifer systems in South Africa, 3) identify the groundwater quality of shallow aquifer systems and infer characteristics to the deep aquifer system, depending on the geologies encounters, 4) identify any structures that may contribute to groundwater flow and the origin of the deep groundwater, 5) analyse thermal spring data as they provide an insight into the groundwater quality at depth, 6) characterisation of potential deep aquifer systems, and 7) determine the possible threats to the aquifer systems and provide mitigation procedures to prevent any contamination from occurring. The defining depth between shallow and deep aquifer systems from a South African perspective is 300 mbgl. Based on the research carried out, all of the above-mentioned aquifer systems are generally classified as secondary aquifer systems in which the groundwater is typically found in fractures and cavities within the bedrock. The volumes of groundwater stored and transported will depend on the degree of fracturing and weathering if the bedrock.

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