Extreme sea levels around the coast of Southern Africa

 

Show simple item record

dc.contributor.advisor Brundrit, Geoff B en_ZA
dc.contributor.author Searson, Sarah en_ZA
dc.date.accessioned 2016-08-11T09:52:04Z
dc.date.available 2016-08-11T09:52:04Z
dc.date.issued 1995 en_ZA
dc.identifier.citation Searson, S. 1995. Extreme sea levels around the coast of Southern Africa. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/21183
dc.description Bibliography: pages 96-100. en_ZA
dc.description.abstract 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. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Oceanography en_ZA
dc.title Extreme sea levels around the coast of Southern Africa en_ZA
dc.type Thesis / Dissertation en_ZA
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Oceanography en_ZA
dc.type.qualificationlevel Masters en_ZA
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image


Files in this item

This item appears in the following Collection(s)

Show simple item record