INVESTIGATING THE PAST AND FUTURE EFFICACY OF SAND RECYCLING IN ADELAIDE, SOUTH AUSTRALIA USING THE ONE-LINE MODEL ‘SHORELINES’

The past efficacy and future viability of sand recycling is evaluated for Adelaide’s beaches in South-Australia, making use of the one-line numerical model, ‘ShorelineS’. A wide variety of measures were introduced here in the last decades, such as (offshore) breakwaters, groynes, revetments and sand nourishments including regular sand recycling using both a pipeline and regular sand carting. Satellite derived shoreline change rates are used to verify modelled rates deduced from the one-line model wherein management and coastal structures were incorporated. The management is then removed from the model simulation to determine the underlying shoreline change rates. The results of these simulation scenarios provide insight into the system and historic performance of management practice. In addition, an investigation into the future viability of sand recycling as a primary management strategy is investigated using a dynamic nourishment application tool.