1. EIA for Proposed Desalination Plant at Mile 6, Swakopmund Specialist Workshop, 4 February 2009 Coastal Physical Characteristics 4 February 2009 Andre Theron Council for Scientific and Industrial Research

2. © CSIR 2009 www.csir.co.za 1. Important issues that need to be addressed by the EIA 2. Methodology to address/investigate these issues 3. Further information required Main aspects of presentation:

3. © CSIR 2009 www.csir.co.za 1. Important issues that need to be addressed by the EIA Mainly the intake basin, but also the pipelines crossing the coast Drivers of coastal processes: winds, waves, currents, (tides) Coastal processes: e.g. marine & aeolian sediment transport Coastal dynamics: beach profile, shoreline evolution, sed. composition Others: backshore area/dunes, sedimentation, dredging?, construction damages, mitigations?, etc.

4. © CSIR 2009 www.csir.co.za 2. Methodology to address/investigate these issues Mainly desktop, qualitative Available information, literature, site visit, etc. Understanding of local processes & dynamics Limited modelling (previous presentation) Limited quantification, estimates Accretion? Erosion? Sedimentation?

5. © CSIR 2009 www.csir.co.za 3. Further information required Coastal topographic survey (incl. surf zone) Nearshore sediment characteristics Proposed construction methods (basin, pipelines) Structure dimensions (& locations) (Elevations of recorded storm wave runups?)

6. Thank you Contact details: A K Theron Tel: 021 888 2511 / 2400 Email: atheron@csir.co.za Fax: 021 888 2693 P O Box 320 7599 Stellenbosch