Sculpted point bar

Position: In-channel

 

Form

Bank-attached arcuate-shaped bar that resembles a point bar along the convex banks of bends. The bar surface is typically inclined towards the channel but at a low angle. Typically these unit bar forms are unvegetated.

 

Process description

In fine-grained systems, these features are sculpted from the surrounding sediment of the adjacent channel bank. Sediment is subsequently draped over the low lying toe of the convex graded bank. May be formed by oblique accretion of suspended load sediments during the waning stage of flows. Scour of adjacent pools accentuates the topography and morphology of these features.