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The flow characteristics at the junction bifurcation with the large width ratio of the branch and the main channel differ with the junction flow having the small width ratio. This article reports the study of the 30°-model junction with the large width ratio for which the the oretical relationship was developed for thedischarge division at the various flow conditions of the main and the branch channel. The smaller the froude number at the main and larger at the branch channel, the wider the bottom dividing streamline will be and more will the flow-diverting in the branch channel. The understanding of the discharge division, flowdividing streamline at the surface and the bottom could be used for the study of the mechanism of sediment bifurcation at the junction.
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Lama et al. (2002) studied this question.
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