| 摘要: |
| 针对传统消能护滩结构存在整体钩连性不足问题,本文开展了正双工透水框架抛投几何特征、水力消能特性、防冲促淤效果试验研究工作,研究表明：单位面积上,正双工透水框架的抛投高度、孔隙率与抛投层数存在一定关系,每一层抛投高度与孔隙率随着抛投层数的增加而减小并逐渐趋于稳定；正双工透水框架具有阻水消能的作用,抛投后抛投区内时均纵向流速与紊动强度垂线分布均发生调整,并建立了抛投区中心时均纵向流速垂线分布公式；抛投层数越大,框架底部流速减小越大,上层流速增加越多,框架内紊动流速减小幅度越大,而框架表面附近紊动强度增加更大；当透水框架的抛投长度达到一定距离后,其消能效果趋于稳定；该框架能够对床面进行有效的守护,抛投区内泥沙落淤效果显著,且两层正双工字框架的守护效果比一层更好。研究成果有助于推动水利水运工程消能护滩结构研究发展。 |
| 关键词: 消能护滩 航道整治 正双工透水框架 冲淤 |
| DOI： |
| 分类号:U617.9 |
| 基金项目:国家重点研发计划资助项目(2022YFC3204504)；国家自然科学基金资助项目(U2040221)；江苏省水利科技项目(2021004) |
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| Study on energy dissipation and beach protection mechanism of a new type of straight double “H” permeable frame |
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LIU Qi1, LUO Tingyu2, HUANG Beibei3, XU Hua1, Zhao Zeya1, WANG Haojie1
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1.River Harbor Engineering Department,Nanjing Hydraulic Research Institute;2.College of Resources and Environmental Sciences,Nanjing Agricultural University;3.Changjiang Waterway Bureau
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| Abstract: |
| In view of the shortcomings of overall hooking ability of traditional energy dissipation and beach protection structure, this paper carried out experimental research on the casting geometric characteristics, hydraulic energy dissipation characteristics and anti-erosion and silt-promoting effects of straight double “H” permeable frame. The research shows that: In unit area, the casting height and porosity of straight double “H” permeable frame have a certain relationship with the number of casting layers, and the casting height and porosity of each layer decrease with the increase of the number of casting layers and gradually become stable. The vertical distribution of the time average longitudinal velocity and turbulence intensity in the zone is adjusted after the casting, and the vertical distribution formula of the time average longitudinal velocity in the center of the zone is established. The larger the number of layers, the greater the decrease of velocity at the bottom of the frame, the greater the increase of velocity at the top, the greater the decrease of turbulent velocity in the frame, and the greater the increase of turbulence intensity near the surface of the frame. When the casting length of the permeable frame reaches a certain distance, the energy dissipation effect tends to be stable. The frame can effectively protect the bed surface, and the effect of sediment deposition in the casting zone is remarkable, and the effect of two-layer straight double “H” permeable frame is better than that of one-layer. The research results are helpful to promote the research and development of energy dissipation and beach protection structures of water conservancy and water transport engineering. |
| Key words: energy dissipation and beach protection waterway regulation straight double “H” permeable frame scouring and silting |
