Answer :
Erosion occurs on the left, while silt is normally transported from the upper left and accumulates in the lee of the jetty on the right.
What are groins and jetties ?
Usually at inlets, a jetty is constructed perpendicular to the land and extends into the water. It retains sand in place, stops the end of the island from washing away, and prevents the passage across the inlet from filling with sand. It also inhibits the current going down the beach, known as the longshore drift. Jetties are often erected near inlets and channels to preserve channels for shipping and navigation. They can be made of concrete or rock.
A groin is constructed perpendicular to the coast and functions similarly to a jetty. However, groins are often erected on straight stretches of beach, not close to inlets or channels, and are smaller than jetties.
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