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The curved weir, as an innovative weir design, offers an extended upstream edge compared to orthogonal weirs, enhancing discharge capacity across its width and ensuring river flow safety. However, for rivers of fixed width, the effects of the curved configurations, partically the central angles, on hydraulic performance, warrant further investigation. This research uses FLOW-3D software to numerically simulate curved weir and orthogonal weir with different central angles (120°, 150° and 180°), and comparatively analyses the hydraulic characteristics of the two types of weirs under different upstream head conditions in terms of flow pattern, flow velocity, discharge coefficient and so on. The results show that under the condition of low upstream head, the discharge capacity of curved weir is obviously stronger than that of orthogonal weir, and when the degree of central angle α = 120°, which provides the necessary theoretical basis for the practical popularization of curved weir.

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Study of Discharge Capacity of Curved Weir

  • 章节

  • 出版模式：

    开放获取

  • 发表日期：

    2025年

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  • Peisheng Qiu,
  • Yu Zhou,
  • Linjie Wang,
  • Yuan Guo,
  • Tinghui Ge,
  • Dongxue Wang,
  • Minrong Xu,
  • Xin Mao,
  • Shuxian Zhu

摘要

The curved weir, as an innovative weir design, offers an extended upstream edge compared to orthogonal weirs, enhancing discharge capacity across its width and ensuring river flow safety. However, for rivers of fixed width, the effects of the curved configurations, partically the central angles, on hydraulic performance, warrant further investigation. This research uses FLOW-3D software to numerically simulate curved weir and orthogonal weir with different central angles (120°, 150° and 180°), and comparatively analyses the hydraulic characteristics of the two types of weirs under different upstream head conditions in terms of flow pattern, flow velocity, discharge coefficient and so on. The results show that under the condition of low upstream head, the discharge capacity of curved weir is obviously stronger than that of orthogonal weir, and when the degree of central angle α = 120°, which provides the necessary theoretical basis for the practical popularization of curved weir.