该河段水流的动力轴线的变化和摆动是常态。

Changing and swing of the axis of flow power is normality.

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作为尝试，文中基于对水流动力轴线、自然岸线、堤防线等河势特征曲线进行系统的频率分析，提出了可用的相关判定参数。

As an attempt in this paper, the available related judgment parameters are found based on the systematical analysis of characteristic curves of flow dynamic axis, bank line and levee line.

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依据试验资料，通过对挖槽水流影响因素的因次分析，提出挖槽后轴线处的流速计算式。

Based on experimental data, through dimensional analysis of the influence factors of channelling flow, put forward the computative formula for velocities along axis after channelling.

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