Abstract
The following sequence of bed deformation leading to a development of a meandering stream path was observed in shallow flows along a straight laboratory channel molded in pumice: (a) appearance of far-spaced bed undulations; (b) appearance of flow-aligned scours at the leeward ends of the undulation crests; (c) growth and spread of the scours and a gradual deformation of the surrounding stream bed into a thatched at offset pattern of scours with intervening mounds; (d) growth and merging of scours along interconnecting sinuous paths; (e) rapid excavation along a preferred tortuous path and appearance of a pronounced meandering thalweg. These events may be interpreted as results of the inherent structure of the parent flow.
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