Below is a link to an experiment conducted by The St. Anthony Falls Hydraulics Lab (under the direction of Tal and Paola) at the University of Minnesota studying the influence of vegetation (alfalfa) on the transition between braided and meandering stream patterns. The interesting thing here is that the change is from braided to a more meandering-like pattern.
http://faculty.gg.uwyo.edu/heller/SedMovs/Tal.htm
Details on the experiment can be found in:
Tal, M., and Paola, C., 2007, Dynamic single-thread channels maintained by the interaction of flow and vegetation: Geology, v. 35, p. 347-350.
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