A preliminary assessment of wave energy conversion by means of the Stellenbosch Wave Energy Converter (SWEC) has indicated the viability of this system as a supplementary source of electric power. In order to refine the preliminary estimates of the cost of power delivered, detailed design of a 770 MW (rated output) installation at a site 60 km north of Cape Town has been undertaken. This paper describes the power conversion characteristics of the SWEC at the proposed site, structural design of the collector arms and generating tower for both mass gravity or piled solutions, a construction scenario involving a casting harbour in nearby Saldanha Bay and the towing and placement of 53 m long precast modules, and finally an assessment of the environmental impact of the proposed 40 km array on the adjacent coastline. The proposed system is found to be both technically and economically feasible and offers a useful contribution towards future electric power supply.

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This paper describes the investigation of means of reducing wave action reaching the shoreward end of a power station cooling water outfall channel without resulting in significant head loss to the outflowing water. A variety of conceptual methods of reducing wave action in the outfall channel was examined. A physical model of the outfall was constructed. It was found that a rubble mound wave energy dissipator located in the outfall channel dramatically reduced wave action at the discharge seal pit.

A study was recently undertaken to investigate sediment transport on a section of coastline where recreational beaches have experienced periodic erosion. Alongshore, onshore/offshore and aeolian sediment transport processes were investigated and quantitative transports predicted with the aid of calibration using surveys and aerial photographs. This paper describes the study and the recommendations proposed for beach quality improvements.

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