n Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese - Port of East London : design and optimisation of the sand traps : technical paper

Volume 44, Issue 4
  • ISSN : 1021-2019



Information on the sedimentary processes at East London was obtained to optimise various facets of the required port maintenance dredging, including a redesign of the old (pre-1994) sand traps. Thus, the location and layout of new sand traps were determined so as to intercept the main sources of sediment deposition in the harbour and entrance channel. The optimum dimensions of these sand traps were also determined in terms of theoretical sand trapping efficiency and practical dredging guidelines. These 'new' sand traps were implemented in 1994, leading to a recent investigation of their effectiveness. Bathymetric surveys were compared, contour maps were analysed regarding sediment build-up and erosion, synoptic difference maps indicating patterns of bottom changes were produced and cross-sections through the sand traps were analysed. Dredging data were analysed to determine any noticeable trends and were also linked in general to deviations from the long-term average wave conditions. The present main sand trap was found to be between 80 % and 90 % effective. The design locations, layouts and dimensions of the sand traps are virtually optimal. Recommendations regarding further possible optimisation of sand traps and dredging were also made.

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