Final answer:
Groins are an example of engineered hard stabilization structures used to trap sand and prevent erosion along the shore.
Step-by-step explanation:
A groin is an example of an engineered hard stabilization structure. It is a barrier constructed perpendicular to the shore in order to trap sand and prevent erosion. Groins are commonly made of concrete, wood, or rock, and they work by disrupting longshore sediment transport along the coast. When waves hit the groin, they are forced to slow down and deposit sand on the updrift side, creating a wider beach and protecting the area from erosion.
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