In the case of a dune coast the front dune is part of the active coastal zone. It extends from the closure depth up to a fixed land boundary (rock, cliff, seawall, sea dike). The active coastal zone (also called active coastal profile) is the cross-shore coastal zone that is highly dynamic, with up and down redistribution of sand by the action of tides, waves and wind. Growth (vertical and/or horizontal) of morphological structures ( beach, bar, dune, sand bank, tidal flat, salt marsh, tidal channel, etc.) by sedimentation. The erosive action that occurs when rock particles of varying sizes are dragged over or hurled against a surface. Definition of coastal sub-zones, adapted from the Shore Protection Manual, 1984 Abrasion
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