Browsing by Author "Mphasha, Rosa"

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    Time series analysis of data measured in the nearshore area
    (Stellenbosch : Stellenbosch University, 2016-03) Mphasha, Rosa; Diedericks, Gerhardus Petrus Jacobus; Fidder-Woudberg, Sonia; Stellenbosch University. Faculty of Science. Dept. of Mathematical Sciences (Applied Mathematics)
    ENGLISH ABSTRACT : Factors that lead to the generation of currents in the nearshore area within the Natal Bight were investigated. The investigation was carried out on data that spans from the 6th June 2012 to the 16th January 2013. The data comprised current measurements, wave measurements, water level measurements, as well as wind measurements. The measurements were decomposed into different direction components in order to study their impacts on corresponding current measurements. Current measurements were resolved into tidal currents and non-tidal currents through the use of harmonic analysis. Stokes drift was estimated using a monochromatic spectrum to obtain the wave induced current. The effect of the wind on the currents was analysed through the use of wind roses and duration analysis. The study was completed with an exploration of the contribution of the Agulhas current. It was found that the waters are characterized by a semi-diurnal, micro-tidal system and tides have a limited contribution to the generation of currents. The contribution of Stokes drift to the overall currents is less than that of tides. Wind is the most significant generator of the nearshore currents.