Submersion (coastal management)

Submersion (Coastal Management), is the sustainable cyclic portion of foreshore erosion where coastal sediments move from the visible portion of a beach to the submerged nearshore region, and later return to the original visible portion of the beach.

Submersion vs Erosion

The sediment that is submerged during rough weather forms landforms including storm bars. In calmer weather waves return sediment to the visible part of beach. Due to longshore drift some sediment can end up further along the beach from where it started. Often coastal areas have developed sustainable coastal positions where the sediment moving off beaches is sustainable submersion. Unfortunately, for many inhabited, anthropogenic interference in coastal processes has meant that erosion is often more permanent then submersion.

Community Perception

The term 'erosion' often is associated with undesirable impacts on the environment, wheras submersion should be celebrated as a sustainable part of healthy foreshores. Communities making decisions about coastal management need to develop understanding of the components of beach recession and be able to separate the component that is temporary sustainable submersion from the more serious irreversible anthropogenic erosion portion.