Beach Nourishment

Beach nourishment describes a process by which sediment (usually sand) lost through longshore drift or erosion is replaced from sources outside of the eroding beach. Sand fill must be compatible with native beach sand. In some cases, beaches have been nourished using a finer sand than the original. 
Seafloor habitat in both source and target areas are disrupted, e.g., when sand is deposited on coral reefs or when deposited sand hardens. Imported sand may differ in character (chemical makeup, grain size, non-native species) from that of the target environment.


information: http://en.wikipedia.org/wiki/Beach_nourishment

Coarse sand

Fine sand

Pictures taken at east coast park.