随上游水位的降低及下游水位的升高，切向流速最大值点也不断向管中心一侧移动。
With the upstream water level reducing and the downstream water level increasing, the highest tangent velocity also moving to the pipe center.
随旋流强度沿程的衰减最大值点不断向管中心移动；
With the swirl decays along the tunnel the highest point moving to the pipe center;
随旋流强度沿程的衰减最大值点不断向管中心移动；
With the swirl decays along the tunnel the highest point moving to the pipe center;
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