开孔促淤板周围悬沙浓度分布特征数值分析  

Analysis of Siltation Characteristics of Different Opening Ratios of Open-hole Siltation Plates

作　　者：石力 卢盛雄 程永舟[1] 范甜甜 SHI Li;LU Sheng-xiong;CHENG Yong-zhou;FAN Tian-tian(School of Hydraulic and environmental Engineering,Changsha University of Science and Technology,Changsha 410114,Hunan Province,China;The Third Engineering Co.,Ltd.of China Second Navigation Bureau,Zhenjiang 212000,Jiangsu Province,China)

机构地区：[1]长沙理工大学水利与环境工程学院,湖南长沙410114 [2]中交二航局第三工程有限公司,江苏镇江212000

出　　处：《中国农村水利水电》2025年第1期54-60,共7页China Rural Water and Hydropower

基　　金：国家自然科学基金项目(52071031);湖南省水利科技项目(XSKJ2023059-50)。

摘　　要：开孔促淤板作为保护岸滩的有效结构,一直被用于保滩护岸、河流海岸生态修复等工程。由于开孔促淤板的存在,使得其周围水流流态变得较为复杂,水流阻力增大,开孔促淤板周围的水流流态会直接影响板周悬沙的运动和输移。基于Mixture两相流模型,对不同开孔率的促淤板周围的流场特性以及悬沙浓度分布特征进行了数值模拟研究。结果表明:开孔促淤板后槽底近壁区(距底高度dH/15)区域,开孔处板后断面相对悬沙浓度值较板前大,格栅处的板后断面相对悬沙浓度较开孔处的板后断面相对较大。当来流流速一定时,开孔促淤板的开孔率越大,板周的相对悬沙浓度越低,开孔促淤板的促淤效果也越不理想;当开孔率为20%时,开孔促淤板的促淤效果显著。Perforated siltation-promoting plates are effective structures for shoreline protection and have been widely used in projects such as beach preservation,riverbank protection,and coastal ecological restoration.The presence of these plates complicates the surrounding flow patterns and increases flow resistance.The flow pattern around the perforated siltation-promoting plates directly influences the movement and transport of suspended sediment.Using a Mixture two-phase flow model,a numerical simulation study was conducted to investigate the flow field characteristics and suspended sediment concentration distribution around siltation-promoting plates with different perforation rates.The results indicate that a recirculation zone appears in the near-wall region at the bottom of the slot behind the perforated siltation-promoting plate(height from the bottom d<H/15).This recirculation zone is primarily located within the range of 0 to 20/3H behind the plate.As the perforation rate increases,the recirculation zone in the near-wall region at the bottom of the slot in front of the plate essentially disappears,and the area of the recirculation zone behind the plate gradually decreases.Both the length and width of the recirculation zone diminish with increasing perforation rate.In the near-wall region at the bottom of the slot behind the plate,the relative suspended sediment concentration at the cross-section behind the perforated areas is lower than in front of the plate.In the region where d>H/15,the relative suspended sediment concentration behind the perforated sections is higher than in front,while the concentration behind the grille sections is relatively higher than behind the perforated sections.When the inflow velocity is constant,a higher perforation rate of the siltation-promoting plate results in a lower relative suspended sediment concentration around the plate,and the siltation-promoting effectiveness of the plate becomes less ideal.When the perforation rate is 20%,the siltation-promoting effect of the perforat

关 键 词：开孔促淤板 数值模拟 流场分布 相对悬沙浓度分布 

分 类 号：TV863[水利工程—水利水电工程] TV131.21