Progradation

 ( Sedimentology ) 

In sedimentary geology and geomorphology, the term progradation refers to the growth of a river delta further out into the sea over time. This occurs when the volume of incoming sediment is greater than the volume of the delta that is lost through subsidence, sea-level rise, or erosion.

Progradation can be caused by:

• Periods of sea level fall which result in marine regression. This can occur during major glaciation within , be caused by changes in the rates of seafloor spreading that affects the volume of the ocean basins,
  (1988). 9780918985743, Society of Economic Paleontologists and Mineralogists. . ISBN 9780918985743
  or tectonic effects on the regional mantle density structure which can change the geoid elevation.
• Extremely high sediment input, such as by the Huang He (Yellow River) in China, which drains the Loess plateau, or from high sediment loads in .