Stable isotope hydrology of the Table Mountain group

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dc.contributor.advisorHarris, Chrisen_ZA
dc.contributor.authorDiamond, Roger Edwarden_ZA
dc.date.accessioned2016-08-11T10:19:36Z
dc.date.available2016-08-11T10:19:36Z
dc.date.issued2014en_ZA
dc.description.abstractRain was collected from 2010 to 2012 at 15 locations around the Cape Fold Belt, at the same time as samples from rivers, springs, seeps and boreholes, totalling 435 samples. Precipitation ranged from -75 ‰ to +40 ‰ for δD and -12 ‰ to +8 ‰ for δ¹⁸O , showing seasonal patterns, with lower δ values in winter and higher in summer. Certain anomalous δ values can be attributed to individual weather events, such as thunderstorms. Using weighted data, the meteoric water line is δD = 6.15 δ¹⁸O + 8.21, which is similar to previous equations. The best fit line for groundwater δ values is δD = 7.09 δ¹⁸O + 10.08, the steeper gradient and higher intercept reflecting the predominance of heavy rainfall events with lower δ values in recharge, known as selection. The range of -47 ‰ to 0 ‰ for δD and -8 ‰ to -1 ‰ for δ¹⁸O values for all groundwater data is about half that of the rain values, due to the averaging effect from mixing during groundwater flow. Rainfall isotope composition is negatively correlated with continentality, as defined by the product of distance to the Atlantic and the closest coast. Isotope composition of rainfall is also strongly negatively correlated with altitude. Sites that are elevated within the landscape have a reduced altitude effect, such as tall peaks, whereas mountain valleys display enhanced altitude effects. Temporal and spatial variations in the strength of the amount effect reveal meteorological variability and emphasise the need for long term monitoring.en_ZA
dc.identifier.apacitationDiamond, R. E. (2014). <i>Stable isotope hydrology of the Table Mountain group</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Geological Sciences. Retrieved from http://hdl.handle.net/11427/21190en_ZA
dc.identifier.chicagocitationDiamond, Roger Edward. <i>"Stable isotope hydrology of the Table Mountain group."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 2014. http://hdl.handle.net/11427/21190en_ZA
dc.identifier.citationDiamond, R. 2014. Stable isotope hydrology of the Table Mountain group. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Diamond, Roger Edward AB - Rain was collected from 2010 to 2012 at 15 locations around the Cape Fold Belt, at the same time as samples from rivers, springs, seeps and boreholes, totalling 435 samples. Precipitation ranged from -75 ‰ to +40 ‰ for δD and -12 ‰ to +8 ‰ for δ¹⁸O , showing seasonal patterns, with lower δ values in winter and higher in summer. Certain anomalous δ values can be attributed to individual weather events, such as thunderstorms. Using weighted data, the meteoric water line is δD = 6.15 δ¹⁸O + 8.21, which is similar to previous equations. The best fit line for groundwater δ values is δD = 7.09 δ¹⁸O + 10.08, the steeper gradient and higher intercept reflecting the predominance of heavy rainfall events with lower δ values in recharge, known as selection. The range of -47 ‰ to 0 ‰ for δD and -8 ‰ to -1 ‰ for δ¹⁸O values for all groundwater data is about half that of the rain values, due to the averaging effect from mixing during groundwater flow. Rainfall isotope composition is negatively correlated with continentality, as defined by the product of distance to the Atlantic and the closest coast. Isotope composition of rainfall is also strongly negatively correlated with altitude. Sites that are elevated within the landscape have a reduced altitude effect, such as tall peaks, whereas mountain valleys display enhanced altitude effects. Temporal and spatial variations in the strength of the amount effect reveal meteorological variability and emphasise the need for long term monitoring. DA - 2014 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2014 T1 - Stable isotope hydrology of the Table Mountain group TI - Stable isotope hydrology of the Table Mountain group UR - http://hdl.handle.net/11427/21190 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/21190
dc.identifier.vancouvercitationDiamond RE. Stable isotope hydrology of the Table Mountain group. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 2014 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/21190en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Geological Sciencesen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherGeologyen_ZA
dc.titleStable isotope hydrology of the Table Mountain groupen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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