The primary function of gabions in erosion control is to:

The primary function of gabions in erosion control is to:

• A. Absorb wave energy
• B. Increase wave reflection
• C. Channel birds
• D. Store freshwater

Answer: (A)

Gabions serve mainly to dissipate wave and flow energy. The rock-filled cages are placed along slopes or shorelines to create a rough, permeable barrier. Water and waves can pass through the gaps and around the rock, but the flow is broken up, slowed, and turned turbulent. This conversion of kinetic energy into friction and turbulence reduces the erosive force on the soil behind and beneath the structure, helping to stabilize the area. That’s why the primary function is absorbing (dissipating) wave energy. They aren’t meant to store freshwater, they aren’t designed to channel birds, and they don’t work by increasing wave reflection; in practice they reduce reflection and, more importantly, energy that would cause erosion.

Gabions serve mainly to dissipate wave and flow energy. The rock-filled cages are placed along slopes or shorelines to create a rough, permeable barrier. Water and waves can pass through the gaps and around the rock, but the flow is broken up, slowed, and turned turbulent. This conversion of kinetic energy into friction and turbulence reduces the erosive force on the soil behind and beneath the structure, helping to stabilize the area.

That’s why the primary function is absorbing (dissipating) wave energy. They aren’t meant to store freshwater, they aren’t designed to channel birds, and they don’t work by increasing wave reflection; in practice they reduce reflection and, more importantly, energy that would cause erosion.