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Abstract
A review of the important stream morphologic theories and hypotheses published before 1971 indicates that none provides a satisfactory explanation to the formation of meandering streams. The law of least time rate of energy expenditure introduced by Yang 1) is used to explain the formation of meandering streams. This law can explain why stable unbraided channels always follow a smooth sinuous course. It also explains how the variation in water discharge, sediment concentration, channel geometry, channel slope, valley slope, geological constraints, etc., should change the characteristics of meandering channels. The arguments made in this paper are strongly supported by laboratory and field observations.
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