Seawalls

Coastal Protection: Seawalls

Seawalls absorb the energy of waves before they can erode away loose materials.
Seawalls can be made of concrete, rocks or wood.
They are effective in protecting cliffs from erosion.
They can only absorb the energy of the oncoming waves. They do not prevent the powerful backwash of refracted waves from washing away the beach materials beneath the walls.
Base of seawalls will be undermined and leads to their collapse.
Seawals are costly to build and maintain as constant repairs have to be made to prevent their collapse.