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Impact of fault structures on the occurrence of groundwater in fractured rock aquifers
Expanded Title:Faults are one of the most important geological structures that control the occurrence of groundwater in hard rock terrain. Fault-controlled aquifers have been one of the most important target zones for water supply especially for water-scarce areas due to its unique nature amongst one of the geological discontinuities. The research project aims to delineate and characterize fault-controlled fractured aquifers by using multiple approaches, and further to develop a sound method for the establishment of conceptual model and estimate aquifer properties and groundwater flow based on established conceptual models, using well calibrated numerical model. In order to select a site for further research, besides a general review of fault structures, two case studies for the Taaibos fault in Alldays, Limpopo and the Waterkloof fault in Rawsonville, Western Cape, were conducted. According to a previous study and field work, the Taaibos fault zone is highly fractured and the fault core weathered. As a result, groundwater largely occurs on the weathered fault core with boreholes never drilled to the depth in excess of 80 m. In contrast, groundwater occurs in the damage zones of the Waterkloof Fault, characterised by the occurrence of an unconfined aquifer on the east damaged zone and confined aquifer with artesian flow on the western zone. In this case, aquifers of the site can be regarded as composite groundwater conduits or barriers.
Date Published:01/02/2015
Document Type:Research Report
Document Subjects:Water Resource Management/IWRM - Hydrogeology
Document Keywords:Ground Water, Hydrology
Document Format:Report
Document File Type:pdf
Research Report Type:Standard
WRC Report No:2053/1/14
ISBN No:978-1-4312-0641-4
Authors:Lin L; Lin H; Xu Y; Ntuli T; Mahlangu F
Project No:K5/2053
Originator:WRC
Document Size:2 190 KB
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