verb (used with object), ag·grad·ed, ag·grad·ing. Physical Geography. to raise the grade or level of (a river valley, a stream bed, etc.)

What means Aggradation?

Aggradation (or alluviation) is the term used in geology for the increase in land elevation, typically in a river system, due to the deposition of sediment. Aggradation occurs in areas in which the supply of sediment is greater than the amount of material that the system is able to transport.

What is an example of Aggradation?

Aggradation can be caused by changes in climate, land use, and geologic activity, such as volcanic eruption, earthquakes, and faulting. For example, volcanic eruptions may lead to rivers carrying more sediment than the flow can transport:this leads to the burial of the old channel and its floodplain.