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Coastal characteristics and extreme wave runup analysis along parts of the South African coastline.
Thesis (MEng)--Stellenbosch University, 2024.
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| Format: | Thesis |
| Language: | en_ZA en_ZA |
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Stellenbosch : Stellenbosch University
2024
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| _version_ | 1867614118646644736 |
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| access_status_str | Open Access |
| author | Hartley, Dayton |
| author2 | Theron, Andre Karl |
| author_browse | Hartley, Dayton Theron, Andre Karl |
| author_facet | Theron, Andre Karl Hartley, Dayton |
| author_sort | Hartley, Dayton |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MEng)--Stellenbosch University, 2024. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/130668 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA en_ZA |
| last_indexed | 2026-06-10T12:46:57.306Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2024 |
| publishDateRange | 2024 |
| publishDateSort | 2024 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/130668 Coastal characteristics and extreme wave runup analysis along parts of the South African coastline. Hartley, Dayton Theron, Andre Karl Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering. Coastal engineering -- South Africa Coastal zone management -- South Africa Hydrodynamics -- South Africa Ocean currents -- South Africa Water temperature -- South Africa Thesis (MEng)--Stellenbosch University, 2024. ENGLISH ABSTRACT: This study investigated the varying coastal characteristics of the long, largely exposed South African coastline. The study reviewed the ocean currents and water temperature, climate and weather systems, inshore seawater levels, offshore wave regime, inshore wave climate, deep-sea bathymetry, inshore slopes, and beach slopes along parts of the South African coastline. Coastal regions exhibiting similar geophysical coastal characteristics were also defined and the respective offshore and inshore wave regimes were discussed. The process of coastal management line determination highlighted the importance of wave runup and coastal flooding levels. Therefore, four wave runup models were selected based on the recommended suitability for use along the South African coastline. The Nielsen & Hanslow (1991) and Stockdon et al (2006) models were selected for sandy beaches, while the Ruggiero et al (2001) model was selected for highly dissipative sandy beaches. The Mather et al (2011) model was selected for wave runup analysis along rocky coasts with a recommended adaption to the ‘C’ coefficient. Hydrodynamic modelling performed by Rossouw et al (2014) provided wave data for approximately two-thirds of the South African coastline. This wave data was provided for 20 coastal stretches – each spanning approximately 100 kilometres of coast. This wave data required alignment with corresponding coastal points. The coastal points were characterised based on the sandy or rocky nature, and sandy coastal points required beach slope input. Therefore, beach slopes were reviewed along parts of the South African coastline, and field data collection was conducted at 23 selected beach sites. Coastal points with missing beach slope data were assigned beach slopes based on regional trend assumptions and the observed degree of exposure. The 1-in-1 and 1-in-100 year extreme wave runup analysis was conducted. The extreme still water level was combined with the extreme wave runup at each coastal point to determine the extreme coastal flooding level along parts of the South African coastline. The reviewed RCP8.5 climate change scenario and associated impacts on wave characteristics were introduced to provide an extreme wave runup prediction for the year 2100. The extreme still water level was combined with extreme wave runup and the predicted sea level rise to determine the future extreme coastal flooding level along parts of the South African coastline. Finally, the sandy and rocky classification of coastal points within each of the 20 coastal stretches was analysed. The extreme wave runup was separated based on classification which allowed for the regional synthesis of coastal characteristics and extreme wave runup. This allowed for the further discussion of regional geophysical characteristics and more detailed coastline categorisation assisted by regional wave runup data. AFRIKAANSE OPSOMMING: Hierdie studie het verskeie kenmerke van die lang, grootliks blootgestelde Suid-Afrikaanse kuslyn ondersoek. Die studie het die seestrome en watertemperatuur, klimaat en weerstelsels, kus-seewatervlakke, diepsee golfklimaat, kusgolfklimaat, diepsee-bodemkontoere, naby-strandse hellings en strandhellings langs dele van die Suid-Afrikaanse kuslyn hersien. Kusstreke met soortgelyke geofisiese kenmerke, is ook gedefinieer en die onderskeie naby-strandse en kusgolfklimaat is bespreek. Die proses om ontwikkelings-terugsetlyne te bepaal het die belangrikheid van golfoploop en kusvloedvlakke beklemtoon. Daarom is vier golfoploopmodelle gekies op grond van hul aanbevole geskiktheid vir gebruik langs die Suid-Afrikaanse kuslyn. Die Nielsen & Hanslow (1991) en Stockdon et al (2006) modelle is geselekteer vir sandstrande, terwyl die Ruggiero et al (2001) model gekies is vir sandstrande met baie plat hellings. Die Mather et al (2011) model is geselekteer vir die golfoploop-analise langs die rotsagtige strande met ‘n aanbevole aanpassing van die “C” koëffisiënt. Hidrodinamiese modellering wat deur Rossouw et al (2014) uitgevoer is, het golfdata verskaf vir ongeveer twee derdes van die Suid-Afrikaanse kuslyn. Hierdie golfdata is vir 20 kusstreke verskaf – wat elk oor ongeveer 100 kilometer kus strek. Hierdie golfdata vereis belyning met ooreenstemmende kuspunte. Die bogenoemde kuspunte is gekarakteriseer op grond van hul sanderige of rotsagtige geaardheid, en strandkuspunte het strandhellings-insette vereis. Daarom is strandhellings langs dele van die Suid-Afrikaanse kuslyn hersien, en meetings daarvan is by 23 geselekteerde strandterreine uitgevoer. Strandhellings is toegeken aan kuspunte met ontbrekende strandhellingdata gebaseer op streeks-aannames en die waargenome graad van golf-blootstelling. ‘n 1-in-1 en 1-in-100 jaar herhaalperiode golfoploop-analise is uitgevoer. Die uiterste stil watervlak is gekombineer met die uiterste golfoploop by elke kuspunt om die uiterste kusvloedvlak langs dele van die kus van Suid Afrika, te bepaal. Die hersiende RCP8.5 klimaatsverandering en gepaardgaande impakte op golfklimaat, is gebruik om ‘n uiterste golfoploopvoorspelling vir die jaar 2100 te verskaf. Die stilwatervlak is gekombineer met die golfoploop en die voorspelde seevlakstyging om die toekomstige kusvloedvlak te bepaal. Laastens, is die sanderige en rotsagtige klassifikasie van kuspunte binne elk van die 20 kusstreke ontleed. Die uiterste golfoploop is geskei op grond van die klassifikasie wat gelei het tot streeks ontledings van kus kenmerke en uiterste golfoploop. Hierdie het gelei tot verdere bespreking van streeks-geofisiese kenmerke en het meer gedetaileerde kuslynkategorisering moontlik gemaak, bygestaan deur streeksgolfoploopdata. Masters 2024-02-12T11:18:02Z 2024-04-27T01:59:24Z 2024-02-12T11:18:02Z 2024-04-27T01:59:24Z 2024-02 Thesis https://scholar.sun.ac.za/handle/10019.1/130668 en_ZA en_ZA Stellenbosch University en_ZA application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Coastal engineering -- South Africa Coastal zone management -- South Africa Hydrodynamics -- South Africa Ocean currents -- South Africa Water temperature -- South Africa Hartley, Dayton Coastal characteristics and extreme wave runup analysis along parts of the South African coastline. |
| title | Coastal characteristics and extreme wave runup analysis along parts of the South African coastline. |
| title_full | Coastal characteristics and extreme wave runup analysis along parts of the South African coastline. |
| title_fullStr | Coastal characteristics and extreme wave runup analysis along parts of the South African coastline. |
| title_full_unstemmed | Coastal characteristics and extreme wave runup analysis along parts of the South African coastline. |
| title_short | Coastal characteristics and extreme wave runup analysis along parts of the South African coastline. |
| title_sort | coastal characteristics and extreme wave runup analysis along parts of the south african coastline |
| topic | Coastal engineering -- South Africa Coastal zone management -- South Africa Hydrodynamics -- South Africa Ocean currents -- South Africa Water temperature -- South Africa |
| url | https://scholar.sun.ac.za/handle/10019.1/130668 |
| work_keys_str_mv | AT hartleydayton coastalcharacteristicsandextremewaverunupanalysisalongpartsofthesouthafricancoastline |