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Accueil du site → Master → Afrique du Sud → 2021 → Investigation of sustainable groundwater resource supply in the crystalline basement aquifers at Relela Village, Greater-Tzaneen Municipality, Limpopo province, South Africa.

University of Venda (2021)

Investigation of sustainable groundwater resource supply in the crystalline basement aquifers at Relela Village, Greater-Tzaneen Municipality, Limpopo province, South Africa.

Ramathieledzha, Ronald

Titre : Investigation of sustainable groundwater resource supply in the crystalline basement aquifers at Relela Village, Greater-Tzaneen Municipality, Limpopo province, South Africa.

Auteur : Ramathieledzha, Ronald

Université de soutenance : University of Venda

Grade : MESMEG 2021

Résumé partiel
South Africa is one of the countries in the world having challenges on the untreated surface and groundwater. In arid and semi-arid areas groundwater is the main source of supply, these areas consist of crystalline basement aquifers which store water either in rock fractures, geological structures (i.e dykes), and contact zones. The water supply crisis is caused by the combination of low rainfall, high evaporation rates, and population growth whose geographical demand for water supply cannot conform to the distribution of exploitable water. The current study aims to evaluate groundwater resource supply in the crystalline basement aquifers at Relela villages, in South Africa, Limpopo province. Based on the literature review, two geophysical techniques were used for groundwater exploration. The proton precession G856 magnetometer was used in magnetic data collection which covered six profiles in four villages. PQWTC-300 (resistivity) was used to study the resistivity of the subsurface lithologies. The traverse lines were set perpendicular to the geological structures trending in the NW-SE direction. The magnetic results presented in x-y graphs showed the variation in magnetic intensities, with the maximum magnetic intensity of 1431 nT and the minimum magnetic intensity of -3561 nT. High magnetic intensity indicated the presence of subsurface geological structures and the low magnetic intensity indicated the presence of weathered subsurface lithologies. The resistivity results indicated low, medium to high (1.2-8.6 ohms) resistivity values throughout the study area. Low resistivity values indicated the presence of weathered subsurface lithologies whereas high resistivity values indicated solid/hard subsurface lithologies. The drilling targets were selected based on the magnetic and resistivity results gathered during groundwater exploration. A drilling machine was used to exploit groundwater resources, several lithologies which were encountered during drilling are ; clay soil, dolerite dykes, gneiss, and granites.

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