What impacts will this project have on sand movement and erosion for Main Beach and Clarkes Beach?
Removal of the groynes is expected to increase sand bypassing with gaining of sand (accretion) to the west of the structure and loss of sand (erosion) to the east of the structure.
Realignment of the structure landward would be expected to see a readjustment of the shoreline with an increase in sand movement from east to west.
With the shift of the structure off the beach, sand bypassing around the structure would see gaining of sand to the west of the structure and loss of sand to the east of the structure. As such, a considerable landward shift to the eastern shoreline position would be expected.
The next stage of this investigation involves a detailed review of up to three design options. This review will involve coastal modelling and detailed assessment to better understand the expected impacts (positive and negative) to the shoreline and sand movement. More information can be found in the Concept Design Development Report (Bluecoast, November 2020).