Overwash

Overwash is the flow of water and sediment over a coastal dune or beach crest during storm events (or other sitations with high water). Overwash is a common process on barrier islands. There are two kinds of overwash: overwash by runup and overwash by inundation. In the fields of coastal geology and geomorphology, 'overwash' refers to a landward flux of sediment due to overtopping of a dune system.[1]

Washover is the sediment deposited inland of a beach by overwash. Washover can be deposited onto the berm crest or as far as the back barrier bay, estuary, or lagoon.

The amount of overwash and washover sedimentation depends on the characteristics of the storm and the setting — human habitat tends to reduce in the amount of sand deposited on a barrier island during overwash leading to impacts on barrier island evolution.[2]

References

  1. ↑ Donnelly, C..; Kraus, N.; Larson, M. (2006). "State of knowledge on measurement and modeling of coastal overwash". Journal of Coastal Research. 22 (4). doi:10.2112/04-0431.1.
  2. ↑ Rogers, L.J..; Moore L. J.; Goldstein E. B.; Hein C. J.; Lorenzo-Trueba J.; Ashton A. D. (2015). "Anthropogenic controls on overwash deposition: Evidence and consequences". Journal of Geophysical Research: Earth Surface. 120 (12). doi:10.1002/2015JF003634.


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