曲面过水断面非正交阻水计算方法

左建; 李立平; 卜慧; 朱迪

doi:10.11988/ckyyb.20240870

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长江科学院院报 ›› 2025, Vol. 42 ›› Issue (10) : 9-14. DOI: 10.11988/ckyyb.20240870

河湖保护与治理

曲面过水断面非正交阻水计算方法

作者信息 +

Calculation Method for Non-orthogonal Water-Blocking Ratio in Curved River Cross-Sections

Author information +

文章历史 +

摘要

阻水比是衡量涉水工程建设对河道行洪影响程度的重要指标。对蜿蜒型、游荡型河道而言,其过水断面为曲面,常规的河道阻水计算方法无法适用。结合非正交于河道过水断面的工程线路,通过设置水流流向偏角阈值,将曲面过水断面划分为多个平面过水断面,提出了曲面过水断面非正交阻水计算公式,并在武汉—松滋高速公路东荆河大桥阻水比计算中进行了应用。计算结果表明,将东荆河大桥跨越处曲面过水断面划分为116个局部过水断面情况下,其阻水总面积为975 m²,阻水比为4.24%;通过经验公式和二维数学模型分析了阻水比计算的合理性,根据阻水比和Henderson公式计算河道内水位壅高值为1 mm,二维数值模型计算桥墩位置处水位壅高值为1~3 mm。考虑经验公式采用的是全断面平均流速,其计算的水位壅高值略小于二维水流数学模型计算的桥墩位置处局部水位壅高值是合理的。通过划分局部过水断面的方式计算曲面河道非正交工程的阻水面积及阻水比是可行的,可为水行政主管部门审批涉河建设工程的行洪影响提供参考。

Abstract

[Objective] Water-blocking ratio is an important indicator for assessing the impact of water-related project construction on river flood discharge. For meandering and wandering rivers whose flow cross-sections are curved, conventional water-blocking calculation methods are not applicable. [Methods] By setting a threshold for the flow direction deviation angle, sections of non-orthogonal water-related projects along the curved river cross-sections were divided into local cross-sections within a certain range of flow direction variation. The local project water-blocking area was calculated within each local cross-section. A non-orthogonal water-blocking calculation method for curved river cross-sections was proposed, and was applied to the calculation of water-blocking ratio of Dongjing River Bridge on Wuhan-Songzi Expressway. [Results] When the curved river cross-section at Dongjing River Bridge was divided into 116 local flow cross-sections, the total water-blocking area was 975 m², and the water-blocking ratio was 4.24%. The rationality of the water-blocking ratio calculation was analyzed using an empirical formula and a two-dimensional mathematical model. According to the water-blocking ratio and Henderson formula, the water level rise in the river channel was calculated to be 1mm, which was consistent with the 1-3 mm rise at the pier position calculated by the two-dimensional numerical model. As the average velocity of the entire cross-section was used in the empirical formula, it was reasonable that the calculated water level rise was slightly smaller than the local rise at the pier position calculated by the two-dimensional numerical model. [Conclusions] It is feasible to calculate the water-blocking area and water-blocking ratio of non-orthogonal projects in curved rivers by dividing them into local flow cross-sections, which can provide a reference for water administrative departments in approving river-related construction projects regarding their flood discharge impact.

导出引用

左建, 李立平, 卜慧, 等. 曲面过水断面非正交阻水计算方法[J]. 长江科学院院报. 2025, 42(10): 9-14 https://doi.org/10.11988/ckyyb.20240870

ZUO Jian, LI Li-ping, BU Hui, et al. Calculation Method for Non-orthogonal Water-Blocking Ratio in Curved River Cross-Sections[J]. Journal of Changjiang River Scientific Research Institute. 2025, 42(10): 9-14 https://doi.org/10.11988/ckyyb.20240870

中图分类号： TV143

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