Abstract: The practical weir is common discharge control structure of spillway, and its head loss is an important parameter for calculating the spillway discharge capacity and the water surface line, as well as for the design of energy dissipator. The empirical formula for calculating head loss recommended by cur ⁃ rent specifications has low accuracy. Therefore, using the hydraulic boundary layer theory to derive the calculation formula of head loss of practical weir in spillway is of practical significance.

Key words: spillway, practical weir, boundary layer, head loss

摘要： 实用堰是常见的溢洪道泄水控制建筑物，其水头损失是计算溢洪道过流能力与水面线，以及进行消能工设计的重要参数。现行规范推荐的水头损失计算经验公式精度较低，为此，采用水力学边界层理论推导溢洪道实用堰水头损失计算公式，极具工程实际意义与应用价值。

关键词: 溢洪道, 实用堰, 边界层, 水头损失