Transverse Bar Conversion: This evolved form of the central bar braiding is characteristic of steep shallow channels in which the lobes consist of coarse bed material, some of which protrudes above the water surface. Thin bed load sheets stall on top of or front of the lobe, which eventually emerges. Flow is then deflected off the edges of the lobe where a pair of diagonal slip faces can develop. Symmetrical Lobe Dissection: Multiple dissection of a lobate bar. Requires high discharge and flume width for a bottleneck to cause a scour by impingement. The symmetricality, or the bottleneck on the downstream side causes flow overrun to erode the top surface over time. Simulation results in dissection of an evolved bar. Chute Cutoff: Once diagonal bar forms exist, with flow obliquely across a wide shallow channel as in the single row alternate bar scheme the conditions are set for chute cutoff. This is an erosional process and involves headwards incision by flow taking a short cut across a bar.

Alluvian Ecospheres: Braided Geomorphology

Harvard GSD
Studio: Neo-Nature
Professor: Ciro Najle

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