Extreme sea levels around the coast of Southern Africa

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dc.contributor.advisorBrundrit, Geoff Ben_ZA
dc.contributor.authorSearson, Sarahen_ZA
dc.date.accessioned2016-08-11T09:52:04Z
dc.date.available2016-08-11T09:52:04Z
dc.date.issued1995en_ZA
dc.descriptionBibliography: pages 96-100.en_ZA
dc.description.abstractTide gauge data from ten ports around the coast of Southern Africa are used to study the nature and behaviour of extreme high sea levels with a view towards predicting the likelihood of extremes occurring in the future. A recorded sea level height can be thought of as a combination of an astronomical tide and a weather determined component. In Southern Africa tides are typically 2 to 2.5 metres in range and the non-tidal residual accounts for up to 50 cm. Sea level is governed by local tides and local meteorology and there is great similarity in the magnitudes and timing at all ports. However tides are found to be the dominant contribution to extreme levels, hence the long term character of tidal variations is important in Southern African extremes. The fortnightly, equinoctial and 4.4 year tidal cycles determine the expected sea level extremes. A prediction technique developed here makes use of the tidal dominance by calculating the likelihood of exceedance for a specific month in a particular year. For any month the highest tide is known and an extreme will depend on the necessary surge occurring. Probability is derived from the surge distribution for that month, carried out for each month in a year, and the results presented as an exceedance chart.en_ZA
dc.identifier.apacitationSearson, S. (1995). <i>Extreme sea levels around the coast of Southern Africa</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Oceanography. Retrieved from http://hdl.handle.net/11427/21183en_ZA
dc.identifier.chicagocitationSearson, Sarah. <i>"Extreme sea levels around the coast of Southern Africa."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Oceanography, 1995. http://hdl.handle.net/11427/21183en_ZA
dc.identifier.citationSearson, S. 1995. Extreme sea levels around the coast of Southern Africa. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Searson, Sarah AB - Tide gauge data from ten ports around the coast of Southern Africa are used to study the nature and behaviour of extreme high sea levels with a view towards predicting the likelihood of extremes occurring in the future. A recorded sea level height can be thought of as a combination of an astronomical tide and a weather determined component. In Southern Africa tides are typically 2 to 2.5 metres in range and the non-tidal residual accounts for up to 50 cm. Sea level is governed by local tides and local meteorology and there is great similarity in the magnitudes and timing at all ports. However tides are found to be the dominant contribution to extreme levels, hence the long term character of tidal variations is important in Southern African extremes. The fortnightly, equinoctial and 4.4 year tidal cycles determine the expected sea level extremes. A prediction technique developed here makes use of the tidal dominance by calculating the likelihood of exceedance for a specific month in a particular year. For any month the highest tide is known and an extreme will depend on the necessary surge occurring. Probability is derived from the surge distribution for that month, carried out for each month in a year, and the results presented as an exceedance chart. DA - 1995 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1995 T1 - Extreme sea levels around the coast of Southern Africa TI - Extreme sea levels around the coast of Southern Africa UR - http://hdl.handle.net/11427/21183 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/21183
dc.identifier.vancouvercitationSearson S. Extreme sea levels around the coast of Southern Africa. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Oceanography, 1995 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/21183en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Oceanographyen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherOceanographyen_ZA
dc.titleExtreme sea levels around the coast of Southern Africaen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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