Browsing Research Articles (Earth Sciences) by Author "van Tonder, Gerrit J."

Now showing items 1-4 of 4

    • Borehole dilution experiment in a Karoo aquifer in Bloemfontein 

      Xu, Yongxin; van Tonder, Gerrit J.; van Wyk, B.; van Wyk, E.; Aleobua, B. (Water Research Commission, 1997)
      This paper shows that a borehole dilution experiment using common salt is a useful technique for better understanding of some hydrogeological features of a fractured aquifer. A sense of such tracer experiments was performed ...

    • Capture zone simulation for boreholes located in fractured dykes using the linesink concept 

      Xu, Yongxin; van Tonder, Gerrit J. (Water Research Commission, 2002)
      Delineation of capture zones for groundwater source protection is normally performed by using numerical codes which are based on the porous medium flow equation. However, boreholes are often sited in or along permeable ...

    • Estimation of recharge using a revised CRD method 

      Xu, Yongxin; van Tonder, Gerrit J. (Water Research Commission, 2001)
      The cumulative rainfall departure (CRD) method, based on the water-balance principle, is often used for mimicking of water level fluctuations. Because of its simplicity and minimal requirement of spatial data, the CRD ...

    • A hydrogeomorphological approach to quantification of groundwater discharge to streams in South Africa 

      Xu, Yongxin; Holness, S.D.; Zhang, J.; van Tonder, Gerrit J. (Water Research Commission, 2002)
      In South Africa, the flow requirements for maintaining the normal functioning of aquatic ecosystems is termed the “ecological reserve”, and these should be determined when a licence application for water allocation is ...