One-dimensional wave spectrum analysis of wind waves off Cape Town

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dc.contributor.advisorHarris, T F Wen_ZA
dc.contributor.authorVan Ieperen, Maarten Pieteren_ZA
dc.date.accessioned2016-03-21T19:26:15Z
dc.date.available2016-03-21T19:26:15Z
dc.date.issued1970en_ZA
dc.description.abstractWind waves in the vicinity of Cape Town, South Africa, were measured by means of an N.I.O. (England) ship-borne wave recorder, in water depths varying from 12 - 140 metres. One dimensional frequency spectra were computed from the records, by power spectrum analysis, based on the method of Blackman and Tukey, using an I.B.M. 1130 Computer. Assumptions of normality and stationarity were tested. The Gaussian assumption of the waves was found to be acceptable for the waters off Cape Town. At the 5% critical level, using the chi-square test, 3 out of 23 records tested were found to be non-Gaussian. No significant difference between the Gaussian properties of the deep and the shallow stations was found. Tests for stationarity applied to 3 selected records showed 1 record as clearly non-stationary. However, this recording was obtained under fluctuating wind conditions. Comparison of the total variances of the power spectra obtained in shoaling water showed a systematic decrease of variance with depth. Normalised spectra did not show a systematic selective attenuation of the variances with frequency. Factors which might have caused the systematic reduction of the total variances with depth have been examined. The bottom friction factor for this coast was estimated. The mean value of the bottom friction is 0.22. This is higher than found by other workers.en_ZA
dc.identifier.apacitationVan Ieperen, M. P. (1970). <i>One-dimensional wave spectrum analysis of wind waves off Cape Town</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Oceanography. Retrieved from http://hdl.handle.net/11427/18125en_ZA
dc.identifier.chicagocitationVan Ieperen, Maarten Pieter. <i>"One-dimensional wave spectrum analysis of wind waves off Cape Town."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Oceanography, 1970. http://hdl.handle.net/11427/18125en_ZA
dc.identifier.citationVan Ieperen, M. 1970. One-dimensional wave spectrum analysis of wind waves off Cape Town. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Van Ieperen, Maarten Pieter AB - Wind waves in the vicinity of Cape Town, South Africa, were measured by means of an N.I.O. (England) ship-borne wave recorder, in water depths varying from 12 - 140 metres. One dimensional frequency spectra were computed from the records, by power spectrum analysis, based on the method of Blackman and Tukey, using an I.B.M. 1130 Computer. Assumptions of normality and stationarity were tested. The Gaussian assumption of the waves was found to be acceptable for the waters off Cape Town. At the 5% critical level, using the chi-square test, 3 out of 23 records tested were found to be non-Gaussian. No significant difference between the Gaussian properties of the deep and the shallow stations was found. Tests for stationarity applied to 3 selected records showed 1 record as clearly non-stationary. However, this recording was obtained under fluctuating wind conditions. Comparison of the total variances of the power spectra obtained in shoaling water showed a systematic decrease of variance with depth. Normalised spectra did not show a systematic selective attenuation of the variances with frequency. Factors which might have caused the systematic reduction of the total variances with depth have been examined. The bottom friction factor for this coast was estimated. The mean value of the bottom friction is 0.22. This is higher than found by other workers. DA - 1970 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1970 T1 - One-dimensional wave spectrum analysis of wind waves off Cape Town TI - One-dimensional wave spectrum analysis of wind waves off Cape Town UR - http://hdl.handle.net/11427/18125 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/18125
dc.identifier.vancouvercitationVan Ieperen MP. One-dimensional wave spectrum analysis of wind waves off Cape Town. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Oceanography, 1970 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18125en_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.titleOne-dimensional wave spectrum analysis of wind waves off Cape Townen_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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