In sedimentary geology and geomorphology, the term progradation refers to the growth of a river delta farther out into the sea over time. This occurs when the mass balance of sediment into the delta is such that the volume of incoming sediment is greater than the volume of the delta that is lost through subsidence, sea-level rise, and/or erosion. ...
The natural extension of a shoreline seaward.
seaward growth of a beach, delta, fan, etc., by progressive deposition of sediment by rivers or shoreline processes.