The UNIBEST CL+ numerical shoreline model was adapted, in collaboration with the suppliers, Deltares, to accommodate the unique conditions of rapid shoreline accretion due to shoreline sediment discharges in a dynamic wave environment with steep nearshore slopes. The model was calibrated to represent the evolution of the shoreline, incorporating accretion of some 400 m in places, over a period of 18 years. The model was also adapted to successfully represent volumes of sand and gravel accretion in the nearshore region.
This specialized modelling tool is employed to predict shoreline evolution, in response to various scenarios of sand and gravel discharges, up to 40 years hence.
Our team delivered the following:
Analysis of beach and nearshore morphology, employing a specially adapted visual basic routine
Computational modelling of coastal processes: wave transformation from offshore to nearshore
Generation of wave-driven currents at the shoreline
Consequent transport of sand and gravel alongshore
Interpretation of predicted shoreline evolution.
Employing the calibrated shoreline model, the client can assess the accretion which results from a range of sand and gravel discharge scenarios. With a year-by- year prediction of shoreline accretion, the client will then be able to plan for the mining of the accreted area to recover the diamondiferous gravel near the bedrock.