In this experiment, conducted at The University of California, Berkeley. Braudick et al. looked the the influence of vegetation and suspended load on the transition from braided stream to meandering stream pattern.

They grew Alfalfa periodically throughout the experiment. They came to somewhat different conclusions than Tal and Paola, in that they feel that suspended load is a requirement for meandering, as it partitions differently from coarse material during stream flow.

Details on the experiment and what is shown in the movie can be found at:

Braudrick, C.A., Dietrich, W.E., Leverich, G.T., and Sklar, L.S., 2009, Experimental evidence for the conditions necessary to sustain meandering in coarse-bedded rivers: Proceedings of the National Academy of Sciences, v. 106, p. 16036-16041.