With an increase of the length of a crest in a given width, labyrinth weirs lead to an increase in flow transition capacity over the weir. This study was performed on a laboratory flume with a length of 12.5 m, width of 0.3 m and a height of 0.4 m, using triangular labyrinth weirs (with and without slots), each having single‐ and two‐cycle models. First, their hydraulic performance was examined, and then it was compared with that of a piano key weir (single‐cycle, two‐cycle). The results showed that the increase in crest length through a slot in single‐ and two‐cycle weirs cannot be an effective factor. The presence of a slot in single‐ and two‐cycle triangular weirs led to a decrease in the discharge coefficient of these weirs up to 35 and 33% respectively, compared to weirs without any slot. This is due to energy loss, local submergence and flow interference in the nose slot even at low flows. However, the flow's index weir (triangular weir slot, one slot) compared to single‐ and two‐cycle piano key weirs dropped by 40 and 26% respectively.

中文翻译：

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实验室研究带和不带槽的三角迷宫堰的排放系数并将其与钢琴键堰进行比较*

在给定宽度上，随着波峰长度的增加，迷宫堰导致了整个堰上的流动过渡能力的增加。这项研究是使用长为12.5 m，宽为0.3 m，高为0.4 m的实验室水槽，使用三角迷宫堰（有槽和无槽）进行的，每个堰具有单周期和二周期模型。首先，检查了它们的水力性能，然后将其与钢琴键堰的水力性能进行了比较（单循环，两循环）。结果表明，通过单圈堰和两圈堰的槽的波峰长度的增加不是一个有效的因素。与没有任何槽的堰相比，在单周期和二周期三角堰中存在槽导致这些堰的排放系数分别降低多达35％和33％。这是由于能量损失，即使在流量低的情况下，鼻子的局部浸没和流量干扰也是如此。但是，与单周期和二周期钢琴键堰相比，流量的指数堰（三角形堰槽，一个槽）分别下降了40％和26％。