Beaches are made up of eroded materials that has been transported from elsewhere and then deposited by the sea. The component of beach at Gunnamatta is quite different from the ones at Cape Schanck, from the pictures we can see that Gunnamatta is a sandy beach rather than volcanic pebbles at Cape Schanck. This beach extends both ways along the coastline, north to St. Andrews and south to Boag Rocks.
As this beach is frequently used during the summer, it has a reasonably protected dune system. Dunes protect the entire beach from eroding. It contains a beach berm, primary dune , Secondary dune, and a tertiary dune. In the primary dune, there's scarce amount of plants, mostly damaged by human impacts. Pioneer stabilizing grasses, small shrubs, and low growing trees mainly colonized in the secondary dune. In the tertiary dunes, it is covered with larger trees, these had different levels of understory of the big trees.
Coastal vegetation play an important role in maintaining the integrity of our dune systems – they act as a windbreak, trapping deposited sand particles and stabilising the dune system. Without vegetation, this natural protective barrier would be lost to the effects of wind and wave erosion. There's large amounts of marram grass, their roots can hold sand together, avoiding blow outs.
Scarce Vegetation on primary dune
Waves aren't able to flow into the pathways of rip currents
We can detect them when waves are going in angles
Result of constructive and destructive waves; waves can rip off plants
Unsatisfactory human impacts:
During summer, people may choose to sit on the dunes, therefore plants die due to the constant weight of human been put on them. Others may walk up and further into the dunes, creating an unnecessary path, exposing bare sand to the wind. Fences and signs should be placed at the start of primary dune.
Car parks and toilets are built near the tertiary dune, maybe even on it. They may have designed like so because for the convenience of human, there's a shorter distance to walk to the beach. However, it does not mean it is a positive thing for the dune system. A managing strategy during building facilities are to put them away from dunes.