Which structures reduce the erosion of coastlines and river banks?

Which structures reduce the erosion of coastlines and river banks?

• A. Soft engineering
• B. Revetments
• C. Sediment
• D. Saltation

Answer: (B)

Protecting coastlines and river banks from erosion relies on structures that absorb energy and stabilize the bank. Revetments are built along the base of banks or shorelines using rock, concrete, or other sturdy materials to create a sloped barrier. Their job is to break up and dissipate the energy of waves or fast-flowing water before it can scour the toe of the bank, reducing erosion and protecting the land behind. Soft engineering, in contrast, refers to non-structural or less intrusive approaches like beach nourishment or dune restoration, which isn’t a specific structure. Sediment is simply material that could be added to replenish a beach, not a protective structure. Saltation is a term for how particles move along a surface, not something built to reduce erosion. So revetments are the most direct option for reducing erosion through a physical barrier.

Protecting coastlines and river banks from erosion relies on structures that absorb energy and stabilize the bank. Revetments are built along the base of banks or shorelines using rock, concrete, or other sturdy materials to create a sloped barrier. Their job is to break up and dissipate the energy of waves or fast-flowing water before it can scour the toe of the bank, reducing erosion and protecting the land behind.

Soft engineering, in contrast, refers to non-structural or less intrusive approaches like beach nourishment or dune restoration, which isn’t a specific structure. Sediment is simply material that could be added to replenish a beach, not a protective structure. Saltation is a term for how particles move along a surface, not something built to reduce erosion. So revetments are the most direct option for reducing erosion through a physical barrier.