1. Absorbing Wave Energy:
- The large, heavy rocks placed at the base of the cliff act as a barrier, absorbing the energy of incoming waves.
- This reduces the force of the waves hitting the cliff face, thus mitigating erosion.
2. Dispersing Wave Force:
- The irregular shape and placement of the rocks help to break up the wave's force, spreading it out over a wider area.
- This reduces the concentrated impact on the cliff face, minimizing erosion.
3. Protecting the Cliff Base:
- Rock armor acts as a buffer, shielding the base of the cliff from direct wave attack.
- This protects the softer underlying soil or rock from being undermined, preventing further erosion.
4. Preventing Undercutting:
- When waves erode the base of a cliff, it can cause the upper sections to become unstable and collapse.
- Rock armor helps prevent undercutting by protecting the base and preventing the formation of caves and crevices.
5. Reducing Sediment Transport:
- By breaking up the wave's energy, rock armor reduces the movement of sediment along the shore.
- This helps maintain a stable beach profile and prevents the loss of valuable sand.
Limitations:
- Rock armor can be expensive to install and maintain.
- It can also have negative impacts on the local ecosystem, altering the natural wave patterns and affecting marine life.
Overall, rock armor provides a valuable defense mechanism against coastal erosion. However, it's important to consider the potential environmental impacts and to use it in conjunction with other coastal protection measures.
