Low walls built into the sea as a type of coastal defence are called?

Low walls built into the sea as a type of coastal defence are called?

• A. Housing tenure
• B. Groundwater
• C. Green belt land
• D. Groynes

Answer: (D)

The concept is coastal defence structures that manage how sediment moves along the shore. Groynes are the low walls built out into the sea at right angles to the coast. They interrupt longshore drift, causing sediment to accumulate on the updrift side and build a wider beach, which absorbs wave energy and reduces erosion of the shore. They can also cause increased erosion further down the coast on the downdrift side, due to changing sediment supply. The other terms relate to land use or natural resources, not coastal barriers.

The concept is coastal defence structures that manage how sediment moves along the shore. Groynes are the low walls built out into the sea at right angles to the coast. They interrupt longshore drift, causing sediment to accumulate on the updrift side and build a wider beach, which absorbs wave energy and reduces erosion of the shore. They can also cause increased erosion further down the coast on the downdrift side, due to changing sediment supply. The other terms relate to land use or natural resources, not coastal barriers.