长江科学院院报2025，Vol.42Issue(10)：9-14,23,7.DOI:10.11988/ckyyb.20240870
曲面过水断面非正交阻水计算方法
Calculation Method for Non-orthogonal Water-Blocking Ratio in Curved River Cross-Sections
摘要
Abstract
[Objective]Water-blocking ratio is an important indicator for assessing the impact of water-related pro-ject 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-sec-tions 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 Riv-er 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 ra-tio 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.[Conclusion]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.关键词
阻水比/曲面河道断面/局部过水断面/阻水面积/非正交/行洪影响Key words
water-blocking ratio/curved river cross-section/local flow cross-section/water-blocking area/non-or-thogonal/flood discharge impact分类
建筑与水利引用本文复制引用
左建,李立平,卜慧,朱迪..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):9-14,23,7.基金项目
湖北省重点研发计划项目(2023BCB115) （2023BCB115）
