A forced-gradient tracer test on the Hansrivier Dyke : Beaufort West, South Africa

Van Wyk, Yazeed; Witthueser, K.

dc.contributor.author	Van Wyk, Yazeed
dc.contributor.author	Witthueser, K.
dc.date.accessioned	2011-11-07T06:50:46Z
dc.date.available	2011-11-07T06:50:46Z
dc.date.issued	2011-10-04
dc.description.abstract	A field-scale pumping test and uranin tracer test was carried out at Hansrivier Farm in Beaufort West to determine the hydraulic properties of the Hansrivier Dyke/Karoo sedimentary rock aquifer. Analysis of borehole images and pumping test results reveal that the fractured-rock aquifer is highly transmissive due to the influence of the Hansrivier Dyke; however its influence is concentrated on extremely limited conductive zones. Results of the tracer test show that chemical transport can take place via multiple flow paths with differing hydraulic properties, such as fracture aperture, connectivity and permeability. Furthermore, diffusion of a tracer into fractures and rock matrix has a universal retardatory travel time due to the various flow paths. In order to interpret the tracer test data, the Single Fissure Dispersion Model (SFDM) was used for inverse modelling of the breakthrough curves. The resulting effective diffusion coefficients are comparable with laboratory-derived values, and are therefore considered to be representative of the investigated part of the aquifer.	en
dc.description.sponsorship	Water Research Commission and the Institute for Groundwater Studies.	en_US
dc.description.uri	http://www.wrc.org.za	en_US
dc.identifier.citation	Van Wyk, Y & Witthueser, K 2011, 'A forced-gradient tracer test on the Hansrivier Dyke : Beaufort West, South Africa', Water SA, vol. 37, no. 4, pp. 437-443.	en
dc.identifier.issn	0378-4738 (print)
dc.identifier.issn	1816-7950 (online)
dc.identifier.other	10.4314/wsa.v37i4.2
dc.identifier.uri	http://hdl.handle.net/2263/17509
dc.language.iso	en	en_US
dc.publisher	Water Research Council	en_US
dc.rights	Water Research Council	en
dc.subject	Fractured rock aquifer	en
dc.subject	Tracer test	en
dc.subject	Pumping test	en
dc.subject	Single Fissure Dispersion Model (SFDM)	en
dc.subject.lcsh	Hydrogeology -- South Africa -- Beaufort West	en
dc.subject.lcsh	Groundwater tracers -- South Africa -- Beaufort West	en
dc.subject.lcsh	Aquifers -- South Africa -- Beaufort West	en
dc.title	A forced-gradient tracer test on the Hansrivier Dyke : Beaufort West, South Africa	en
dc.type	Article	en