A WEAKLY NONLINEAR ANALYSIS OF BAR MODE REDUCTION PROCESS

摘要

This research incorporates the cross interference between the modes of doublerow bars and alternate bars into a weakly nonlinear analysis, and aims at clarifying the degree of the cross interference between the modes. The rate of linear amplification is introduced into this model so that the same order can examine alternate bars and double row bars. Hydraulic conditions of this analysis were set at a large width-depth ratio in which double-row bars were generated. The results of this analysis did not reproduce the results of hydraulic experiments quantitatively. However, it reproduced the qualitative characteristics of bar mode decrease process. Findings revealed that neither modes (alternate bars and double-row bars) do not grow up at the same time.