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最近 ,小型倾斜河流中的阶梯形鱼道建筑以它的简易与实用而变得日益重要。在这种鱼道中出现的滚动流将产生波涌 ,并继续向下传播 ,而且它的周期性滚动可能会严重危害鱼道。因此 ,我们着手研究了它的严重性以便设计者在设计鱼道时能考虑这些因素。由实验证实滚动流源于阶梯形鱼道的上游。滚动流在稳定流与半平滑流间转变 ,它在一定时间间隔内不断地从稳定流变成半平滑流 ,又从半平滑流变成稳定流。它的流量值随着阶梯形水道的几何形状变形而呈现上下限。流量值和时间间隔均随着水池长度的增加而增加。
Recently, stepped-shaped fishline structures in small inclined rivers have become increasingly important with its simplicity and utility. The rolling stream that appears in this fishway will surge and continue to propagate downward, and its periodic rolling may be a serious hazard to the fishline. Therefore, we set out to study its severity so that designers can consider these factors when designing fish paths. Experiments show that the flow of the scrolls from the fish-shaped channel upstream. The rolling flow changes between stable flow and semi-smooth flow. It continuously changes from steady flow to semi-smooth flow and semi-smooth flow to steady flow at a certain time interval. Its flow rate value varies with the geometry of the ladder-shaped watercourse and presents the upper and lower limits. Flow rates and intervals increase with pool length.