Estimation and control of local scouring downstream hydraulic structures is an important aspect for designing hydraulic structures. Lack predicting of local scouring can cause endangered hydraulic structures. This study performed aseries of laboratory experiments in order to look for the scouring at the downstream of triangular labyrinth weir. The effects of four different weir apex angles on the local scour were tested. The tested angles were 90°, 75°, 60°, and 45° under varied rates of flow. A wier of linear crest ‘180°’ was also included in the test program to distinguish the rendition of the triangular labyrinth weir and to benchmark some existing formulas of local scouring downstream weirs. Consequently, a great reduction of the scour parameters was obtained. Results referred to that the best weir apex angle was found to be 60°, which produced minimum values of scour parameters downstream the triangular labyrinth weir. The formulas of others performed well compared to experimental results. Moreover linear regression formulae were also proposed.

估计和控制下游冲刷下游水工结构是设计水工结构的重要方面。缺乏对局部冲刷的预测可能会导致水工建筑物的危险。这项研究进行了一系列实验室实验，以寻找三角迷宫堰下游的冲刷情况。测试了四个不同的堰顶角对局部冲刷的影响。在不同的流速下，测试角度分别为90°，75°，60°和45°。测试程序中还包括一个线性波峰“ 180°”，以区分三角形迷宫堰的演绎形式，并基准一些局部冲刷下游堰的现有公式。因此，冲刷参数大大降低。结果指出，最佳堰顶角为60°，它在三角迷宫堰下游产生了冲刷参数的最小值。与实验结果相比，其他公式的效果很好。此外，还提出了线性回归公式。