2000 Volume 44 Pages 771-776
Formative condition and mechanism of a self-formed stream channel in a straight river course are studied in terms of flume tests and numerical analysis. The results support that a self-formed stream channel in a straight river course is produced in the formative domain of multiple row bars. In developing stage of self-formed stream channel, multiple row bars are produced firstly, and then transformed into alternate bars. Finally, a self-formed stream channel is produced. In addition, the developing of the mode (0, 2) for bed configuration promotes the formation of self-formed stream channel. Formation of equilibrium multiple row bars is investigated by means of numerical analysis under a wide range of hydraulic condition. The numerical results realize that any multiple row bar changes into a self-formed stream channel under the studied conditions.
