Coastal sediment is supplied from a variety of sources

Sediment budget:
The balance between inputs and the removal of sediment. Positive budget is accretion of
material on shoreline, negative budget causes the shoreline to recede landwards.
Human – Beach nourishment
Offshore – Marine deposition
Terrestrial – Fluvial (90% of beach material), sub-aerial processes, aeolian and longshore
drift.