rock wall- Walls of concrete or rock, built at the base of a cliff or at the back of a beach, or used to protect a settlement against erosion or flooding.
beach nourishment- also referred to as beach replenishment--describes a process by which sediment (usually sand) lost through longshore drift or erosion is replaced from sources outside of the eroding beach.
sand bar- A long, narrow sandbank, esp. at the mouth of a river
beach nourishment- also referred to as beach replenishment--describes a process by which sediment (usually sand) lost through longshore drift or erosion is replaced from sources outside of the eroding beach.
sand bar- A long, narrow sandbank, esp. at the mouth of a river
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