Variations in the frontal profile of laboratory deltas were determined in a series of controlled flume experiments. Principal variables isolated were stream velocity and bed shear stress, depth-ratio and sediment type. The base of the frontal profile was found to evolve from angular to incipiently tangential, to tangential, to strongly tangential, to low angle concave, as velocity and depth-ratio increased. Wave action and small oscillations of base level sometimes formed convex or S-shaped frontal profiles.

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