1) INPUTS- river sediment, sediment from cliffs that have been eroded or suffered landslides, and sediment that has been transported by waves from offshore.
2) PROCESSES- wave action, tidal movement, erosion, weathering, transportation, deposition.
3) OUTPUTS- sediment washed out to sea, or deposited further along the coast.
Coastal sediment cells (littoral cells) are lengths of coastline that are pretty much are entirely self-contained for the movement of sediment. Each one is a coastal system. So processes going on in one cell don't affect the movement of sediment in another cell.
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