The performance of a rake for large wood retention has been analysed in clean water and for the case of a slit check dam. An experimental investigation was conducted in a steep rectangular flume, by employing regular cylinders at different rates and rake geometry. The effects of the inclination and distance of the rake from the check dam have been analysed in terms of the trapping efficiency and backwater effect. By intercepting the incoming wood material, the rake avoids the direct occlusion of the slit check dam, preventing large backwater rises and allowing the dam to work properly even in the presence of intense woody flow. The trapping efficiency slightly increases with the inclination of the rake when it remains very close to the check dam, but it tends to decrease when the structure is out of the calm water region upstream of the dam. Additionally, a comparison between the rake performance and the check dam without retaining devices is presented.

中文翻译：

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在干净的水中将带有大型木结构的止水坝连接起来

耙子在大面积木材上的性能已在清水和开裂止水坝的情况下进行了分析。通过使用规则的圆柱体以不同的速率和前刀几何形状，在陡峭的矩形水槽中进行了实验研究。从诱集效率和回水效应方面分析了耙子距止水坝的倾角和距离的影响。通过拦截传入的木材，耙子避免了直缝式止水坝的直接堵塞，从而防止了大的回水上升，即使在强烈的木质流动下，大坝也能正常工作。当耙子非常接近止水坝时，捕集效率随耙子的倾斜而略有增加，但是当结构不在坝上游的平静水域中时，捕集效率往往会降低。