沉水植被斑块尾流多尺度紊流结构研究
TV133; 探究斑块尾流中多尺度紊流结构对理解植被群落影响下的泥沙输移规律和河床演化过程有着重要意义.通过室内水槽试验,分析不同高径比及植被体积分数影响下的斑块后水流特性,得到时均流速及雷诺应力分布规律;通过谱本征正交分解对其脉动场进行分析,探究不同尺度涡的空间模态及能量分布规律.研究结果表明:① 冠层垂向剪切层内剪切强度及其最大量纲一剪切层垂向厚度随着植被体积分数增大而增大,随着高径比增大而减小.② 斑块尾流中,大尺度涡旋对应频率集中在 0.15～0.29 Hz,对应斯特劳哈尔数为 0.16～0.32,垂向分布介于0.2～1.3 倍植被高度,纵向分布介于2～6 倍斑块直径,横向关于植被中心...
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| Published in | 水科学进展 Vol. 34; no. 6; pp. 913 - 927 |
|---|---|
| Main Authors | , , , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
长江保护与绿色发展研究院,江苏 南京 210098%南京水利科学研究院,江苏 南京 210029
01.11.2023
南京水利科学研究院,江苏 南京 210029%南京水利科学研究院,江苏 南京 210029 天津大学建筑工程学院,天津 300072 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1001-6791 |
| DOI | 10.14042/j.cnki.32.1309.2023.06.009 |
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| Abstract | TV133; 探究斑块尾流中多尺度紊流结构对理解植被群落影响下的泥沙输移规律和河床演化过程有着重要意义.通过室内水槽试验,分析不同高径比及植被体积分数影响下的斑块后水流特性,得到时均流速及雷诺应力分布规律;通过谱本征正交分解对其脉动场进行分析,探究不同尺度涡的空间模态及能量分布规律.研究结果表明:① 冠层垂向剪切层内剪切强度及其最大量纲一剪切层垂向厚度随着植被体积分数增大而增大,随着高径比增大而减小.② 斑块尾流中,大尺度涡旋对应频率集中在 0.15～0.29 Hz,对应斯特劳哈尔数为 0.16～0.32,垂向分布介于0.2～1.3 倍植被高度,纵向分布介于2～6 倍斑块直径,横向关于植被中心线呈现出非对称分布.③ 纵向出流流速及剪切层内紊动强度是影响稳定尾流区长度的重要因素.剪切层纵向输运速度随着纵向出流流速增大而增大,剪切层垂向扩散速度随着紊动强度的增大而增大. |
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| AbstractList | TV133; 探究斑块尾流中多尺度紊流结构对理解植被群落影响下的泥沙输移规律和河床演化过程有着重要意义.通过室内水槽试验,分析不同高径比及植被体积分数影响下的斑块后水流特性,得到时均流速及雷诺应力分布规律;通过谱本征正交分解对其脉动场进行分析,探究不同尺度涡的空间模态及能量分布规律.研究结果表明:① 冠层垂向剪切层内剪切强度及其最大量纲一剪切层垂向厚度随着植被体积分数增大而增大,随着高径比增大而减小.② 斑块尾流中,大尺度涡旋对应频率集中在 0.15～0.29 Hz,对应斯特劳哈尔数为 0.16～0.32,垂向分布介于0.2～1.3 倍植被高度,纵向分布介于2～6 倍斑块直径,横向关于植被中心线呈现出非对称分布.③ 纵向出流流速及剪切层内紊动强度是影响稳定尾流区长度的重要因素.剪切层纵向输运速度随着纵向出流流速增大而增大,剪切层垂向扩散速度随着紊动强度的增大而增大. |
| Abstract_FL | The multi-scale turbulent structures enable understanding the vegetation patch-affected sediment transport and riverbed evolution.Here,flume-based wake flow characteristics were analysed under different aspect ratios and vegetation densities.The mean flow velocity and Reynolds stress distribution were obtained.The fluctuation field was analysed using the spectral proper orthogonal decomposition to obtain different scale eddies′spatial modes and energy distribution.We demonstrate the following:① The shear strength and non-dimensional shear layer thickness increased with the vegetation density and decreased with increasing canopy shear layer aspect ratio.②The wake flow large-scale eddies exhibited a 0.15-0.29 Hz frequency and 0.16-0.32 Strouhal number(Sr).The eddies exhibited 0.2-1.3 times higher vertical distribution than the vegetation and 2-6 times wider longitudinal distribution than the patch diameter.The eddies exhibited transverse distribution from the vegetation centreline.③ The wake region longitudinal outflow velocity and turbulence intensity affected the stable wake region length.The longitudinal outflow velocity and turbulence intensity determined the shear layer longitudinal transportation and vertical diffusion velocities,respectively. |
| Author | 吴时强 於思瀚 吴修锋 张维乐 王芳芳 薛万云 张宇 |
| AuthorAffiliation | 天津大学建筑工程学院,天津 300072;南京水利科学研究院,江苏 南京 210029%南京水利科学研究院,江苏 南京 210029;长江保护与绿色发展研究院,江苏 南京 210098%南京水利科学研究院,江苏 南京 210029 |
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| Author_FL | ZHANG Yu YU Sihan XUE Wanyun ZHANG Weile WU Shiqiang WANG Fangfang WU Xiufeng |
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| DocumentTitle_FL | Investigation of wake flow on submerged vegetation patches based on spectral proper orthogonal decomposition |
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| Keywords | 沉水植被 submerged vegetation 多尺度紊流 SPOD the length of the wake region multi-scale turbulent structures 植被斑块 vegetation patch 尾流区长度 谱本征正交分解 |
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| PublicationTitle | 水科学进展 |
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| Publisher | 长江保护与绿色发展研究院,江苏 南京 210098%南京水利科学研究院,江苏 南京 210029 南京水利科学研究院,江苏 南京 210029%南京水利科学研究院,江苏 南京 210029 天津大学建筑工程学院,天津 300072 |
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| Snippet | TV133; 探究斑块尾流中多尺度紊流结构对理解植被群落影响下的泥沙输移规律和河床演化过程有着重要意义.通过室内水槽试验,分析不同高径比及植被体积分数影响下的斑块后水流特性,得到时均流速及雷诺应力分布规律;通过谱本征正交分解对其脉动场进行分析,探究不同尺度涡的空间模态及能量分布规律.研究结果表明:①... |
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| Title | 沉水植被斑块尾流多尺度紊流结构研究 |
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