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The South African Wave Atlas

This study presents the development and implementation of a wave atlas model for South Africa, outlining the challenges faced and the way forward. The study identifies insufficient reference and physical processes data, as well as the impact of climate change on coastal vulnerability. The model utilizes input data from offshore waves/swell, bathymetry, and regional charts to estimate wave power potential under transitional/intermediate water depth conditions. The methodology is applied to specific regions, including Table Bay and False Bay, to provide insights into summer, autumn, winter, and spring wave characteristics. The study aims to publish a book on the wave atlas and expand the study to a 30-year hindcast with the CHPC.

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The South African Wave Atlas

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  1. The South African Wave Atlas Model development and Implementation Carla-Louise Ramjukadh

  2. Results Way forward Overview • Integrated Coastal Management a Coastal Vulnerability study undertaken by the CSIR for DEA, 2014: • Insufficient reference data • Lack of physical processes data • Climate change

  3. Results Way forward Global wave power estimation • Mean annual power level is about 40 to 50 kW/m wave crest

  4. Results Way forward Overview Model Input Data • Offshore waves/swell: • National Centre for Environmental Prediction (NCEP) - Global wave model • 1997 – 2013 • ~ 0.5° resolution • Bathymetry • South African Navy Hydrographic Office (SANHO) • Regional SAN charts • 500 m and 200 m resolution

  5. Results Way forward Overview Model points • Model output points • Vertices at 500m and/or 200m grid resolution intervals along the 7m and 15m bathymetric contour

  6. Results Way forward Overview Model regions 200 m resolution 500 m resolution SL PN RB DB HB PE LB PS SH TH EL YZ AB TB MB SB PB PB JB FB HE SB HE

  7. Results Way forward Overview SWAN Modelling Simulating WAves in the Nearshore (SWAN) model - Wave generation and refraction within the shallow depths

  8. Results Way forward Overview Wave power potential estimation

  9. Results Way forward Overview Transitional / Intermediate water depth conditions

  10. Results Way forward Overview Transitional / Intermediate water depth conditions

  11. Way forward Overview Methodology Results

  12. Way forward Overview Methodology Results Table Bay

  13. Way forward Overview Methodology Results False Bay

  14. Way forward Overview Methodology Results Summer

  15. Way forward Overview Methodology Results Summer

  16. Way forward Overview Methodology Results Autumn

  17. Way forward Overview Methodology Results Autumn

  18. Way forward Overview Methodology Results Autumn

  19. Way forward Overview Methodology Results Autumn

  20. Way forward Overview Methodology Results Winter

  21. Way forward Overview Methodology Results Spring

  22. Way forward Overview Methodology Results Total annual wave power

  23. Way forward Overview Methodology Way Forward Results • Publication: In press • Wave power of SA • Extreme waves of SA • Wave atlas: Book in press • Expand to a 30 year hind-cast study with the CHPC

  24. Thank you Carla-Louise Ramjukadh South African Weather Services Cape Town Office Marine Research Unit E: carla.Ramjukadh@weathersa.co.za

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