Why do people make groyne and piers and sea walls?
Groynes are used to help control erosion and sedimentation along shorelines having easily eroded soils or in areas where the weather and currents cause ongoing erosion of normally stable soils. Piers are also constructed at right angles to the shore, and are used to tie up boats and ships. Large piers may have commercial buildings on them, from gas docks and marina supply stores to warehouses. Groynes are typically solid embankments rising from the bottom, while piers are more like bridges in construction, allowing wind and water to pass between the water and the top of the pier. Sea Walls are built along the shoreline rather than perpendicular to it, and may consist of a ‘hardened’ shore (concrete and stone laid on grade as the ground emerges from the water), or may be a vertical concrete or steel structure. In any case, sea walls are intended to prevent erosion of the adjacent ground into the waterway. Frequently seawalls are places alongside docks to provide additional depth to faci
