scour and fill

scour and fill
   [ geomorphology ]
   A process of alternate excavation and refilling of a channel, as by a stream or the tides; especially such a process occurring in time of flood, when the discharge and velocity of an aggrading stream are suddenly increased, causing the digging of new channels that become filled with sediment when the flood subsides.
   Compare: cut and fill.

Glossary of landform and geologic terms. 2013.

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