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Estimation of groundwater recharge via percolation outputs from a rainfall / runoff model for the Verlorenvlei estuarine system, West coast, South Africa

dc.contributor.authorWatson, Andrewen_ZA
dc.contributor.authorMiller, Jodieen_ZA
dc.contributor.authorFleischer, Melanieen_ZA
dc.contributor.authorDe Clercq, Willemen_ZA
dc.date.accessioned2019-07-08T08:58:14Z
dc.date.available2019-07-08T08:58:14Z
dc.date.issued2018
dc.identifier.citationWatson, A., et al. 2018. Estimation of groundwater recharge via percolation outputs from a rainfall / runoff model for the Verlorenvlei estuarine system, west coast, South Africa. Journal of Hydrology, 558:238-254en_ZA
dc.identifier.issn1879-2707 (online)
dc.identifier.issn0022-1694 (print)
dc.identifier.otherdoi: 10.1016/j.jhydrol.2018.01.028
dc.identifier.urihttp://hdl.handle.net/10019.1/106307
dc.descriptionCITATION: Watson, A., et al. 2018. Estimation of groundwater recharge via percolation outputs from a rainfall / runoff model for the Verlorenvlei estuarine system, west coast, South Africa. Journal of Hydrology, 558:238-254.en_ZA
dc.descriptionThe original publication is available at https://www.sciencedirect.comen_ZA
dc.description.abstractWetlands are conservation priorities worldwide, due to their high biodiversity and productivity, but are under threat from agricultural and climate change stresses. To improve the water management practices and resource allocation in these complex systems, a modelling approach has been developed to estimate potential recharge for data poor catchments using rainfall data and basic assumptions regarding soil and aquifer properties. The Verlorenvlei estuarine lake (RAMSAR #525) on the west coast of South Africa is a data poor catchment where rainfall records have been supplemented with farmer’s rainfall records. The catchment has multiple competing users. To determine the ecological reserve for the wetlands, the spatial and temporal distribution of recharge had to be well constrained using the J2000 rainfall/runoff model. The majority of rainfall occurs in the mountains (±650 mm/yr) and considerably less in the valley (±280 mm/yr). Percolation was modelled as ~3.6% of rainfall in the driest parts of the catchment, ~10% of rainfall in the moderately wet parts of the catchment and ~8.4% but up to 28.9% of rainfall in the wettest parts of the catchment. The model results are representative of rainfall and water level measurements in the catchment, and compare well with water table fluctuation technique, although estimates are dissimilar to previous estimates within the catchment. This is most likely due to the daily timestep nature of the model, in comparison to other yearly average methods. These results go some way in understanding the fact that although most semi-arid catchments have very low yearly recharge estimates, they are still capable of sustaining high biodiversity levels. This demonstrates the importance of incorporating shorter term recharge event modeling for improving recharge estimates.en_ZA
dc.description.abstractsk4201907
dc.description.urihttps://www.sciencedirect.com/science/article/pii/S0022169418300283
dc.format.extent33 pagesen_ZA
dc.language.isoen_ZAen_ZA
dc.publisherElsevieren_ZA
dc.subjectGroundwater modellingen_ZA
dc.subjectEstuarine systems -- Verlorevlei (South Africa)en_ZA
dc.subjectRainfall -- Verlorevlei (South Africa)en_ZA
dc.subjectJ2000 rainfall/runoff 19 modelen_ZA
dc.titleEstimation of groundwater recharge via percolation outputs from a rainfall / runoff model for the Verlorenvlei estuarine system, West coast, South Africaen_ZA
dc.typeArticleen_ZA
dc.description.versionPre-printen_ZA
dc.rights.holderAuthors retain copyrighten_ZA


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