I think another course of action to consider would be to limit the impact that wave action has on the coastline by building an artificial reef line out from those sections of coastline where coastal erosion is having an impact on roads, buildings and residences.
The reef could be built from limestone material locally available and could be constructed to serve several functions:
– Create a calm area of water inside the reef that would be safe for swimming at all times of the year.
– Provide a natural habitat for fish species, in particular abalone, thereby increasing the available habitat for species that are targeted by recreational fishers.
– Provide a safe platform for the retrieval of abalone by recreational fishers.
– Provide the formation of surfable waves for the many recreational surfers in the Perth region.
This would create a new focal point for people to the Quinns Rocks foreshore thereby creating business opportunities on the foreshore to cater for the increased numbers of people (swimmers, fishers, surfers, tourists) frequenting the area.
The effect this artificial reef would have on wave size hitting the coast can be seen by the much smaller waves hitting the coast during storm events between Sorrento and Kallaroo where reefs form an almost continuous barrier off this section of coastline.
An artificial reef of limited length and directly out from the area being eroded at present at Quinns Rocks might be able to be constructed within 100 metres of the coastline in the Quinns Rocks area and result in the same level of protection.
DION FOTAKIS, Hillarys