Groyne
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A groyne or groin is a rigid aquatic structure built perpendicularly from an ocean shore or a river bank, interrupting water flow and limiting the movement of sediment. It is usually made out of wood,
Groynes in Sitges, Catalonia, Spain
Rock groyne at Sea Bright Beach, New Jersey.
Wooden groyne, Mundesley, UK
Lumberville Wing Dam on the Delaware River at Bulls Island, New Jersey. Some water is pouring over the wing dams or groins; there is a navigation channel between them.
Gabion
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A gabion is a cage, cylinder, or cube, typically mesh, filled with solid material suitable to use in various civil engineering and military applications. Ballasts include rocks, sand, soil, used tires
Groyne
…generally straight but could be of various plan view shapes, permeable or impermeable, built from various materials such as wood, sand, stone rubble, or gabion, etc. The term groyne is derived from the Old French groign, from Late Latin grunium, "snout…
An inclined stacked wall of gabions supporting a multilane roadway near Sveti Rok, Croatia
Gabions as X-ray protection during customs inspection
Mattress gabions protecting a bank
Gabions stepped with the slope as a bridge abutment