Application of the rainfall infiltration breakthrough (RIB) model for groundwater recharge estimation in west coastal South Africa

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dc.contributor.authorXianfeng, Sun
dc.contributor.authorJovanovic, Nebo Z.
dc.contributor.authorKapangaziwiri, Evison
dc.contributor.authorBrendonck, Luc
dc.contributor.authorBugan, Richard Domain Hunter
dc.date.accessioned2013-11-14T11:55:58Z
dc.date.available2013-11-14T11:55:58Z
dc.date.issued2013
dc.description.abstractRecharge estimation in arid and semi-arid areas is very challenging. The chloride mass balance method applied in western South Africa fails to provide reliable recharge estimates near coastal areas. A relationship between rainfall events and water level fluctuations (WLF) on a monthly basis was proposed in the rainfall infiltration breakthrough (RIB) model for the purpose of groundwater recharge estimation. In this paper, the physical meaning of parameters in the CRD and previous RIB models is clarified, and the RIB model is reviewed with the algorithm improved to accommodate various time scales, namely, daily, monthly and annual scales. Recharge estimates on a daily and monthly basis using the revised RIB approach in 2 study areas, one in a sandy alluvial aquifer (Riverlands) and the other in the Table Mountain Group (TMG) shallow unconfined aquifer (Oudebosch), are presented, followed by sensitivity analysis. Correlation analysis between rainfall and observed WLF data at daily scale and monthly scale, together with recharge estimates obtained from other methods, demonstrates that the RIB results using monthly data are more realistic than those for daily data, when using long time series. Scenarios using the data from Oudebosch with different rainfall and groundwater abstraction inputs are simulated to explore individual effects on water levels as well as recharge rate estimated on a daily basis. The sensitivity analysis showed that the recharge rate by the RIB model is specifically sensitive to the parameter of specific yield; therefore, the accurate representative specific yield of the aquifer needs to be selected with caution. The RIB model demonstrated in these two cases can be used to estimate groundwater recharge with sufficiently long time series of groundwater level and rainfall available in similar regions. In summary, the RIB model is best suited for shallow unconfined aquifers with relatively lower transmissiv - ity; the utility of the RIB model for application in different climatic areas under different hydrogeological conditions needs to be further explored.en_US
dc.description.accreditationWeb of Scienceen_US
dc.identifier.citationXianfeng, Sun, et al. (2013). Application of the rainfall infiltration breakthrough (RIB) model for groundwater recharge estimation in west coastal South Africa. Water SA, 39(4): 221-230en_US
dc.identifier.issn0378-4738
dc.identifier.urihttp://hdl.handle.net/10566/815
dc.language.isoenen_US
dc.privacy.showsubmitterfalse
dc.publisherWater Research Commissionen_US
dc.status.ispeerreviewedtrue
dc.subjectRIB modelen_US
dc.subjectShallow unconfined aquiferen_US
dc.subjectGroundwater-level fluctuationen_US
dc.subjectGroundwater rechargeen_US
dc.subjectTable Mountain Group aquifeen_US
dc.titleApplication of the rainfall infiltration breakthrough (RIB) model for groundwater recharge estimation in west coastal South Africaen_US
dc.typeArticleen_US

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