Sand sheet

Position: In-channel

 

Form

Relatively homogeneous, uniform, tabular sand deposits which cover the entire bed. May consist of an array of bedforms, reflecting riffle, dune or plane-bed sedimentation.

 

Process description

Formed when transport capacity is exceeded or competence is decreased and bedload deposition occurs across the bed. Generally reflect transport capacity-limited conditions due to an oversupply of sediment. Bedforms are subject to frequent removal and replacement by floods as the sand sheet moves downstream as a pulse.