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| 植物对明渠流速分布影响的试验研究 |
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闰静1,唐洪武1,田志军2,何晔2
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1. 水文水资源与水利工程国家重点实验室,江苏南京210098;河海大学水电学院,江苏南京210098;水资源高效利用与工程安全国家工程研究中心,江苏南京210098
2. 水文水资源与水利工程国家重点实验室,江苏南京210098;河海大学水电学院,江苏南京210098
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| 摘要: |
| 采用圆柱铝棒模拟刚性植物进行水槽试验,利用激光流速仪LDV对含非淹没、淹没植物明渠流场进行了测量,对模拟植物淹没度、密度对流速分布的影响进行了研究.分析表明,植物非淹没条件下的平均流速可以表示为流量、渠宽、水深和植物密度的函数；植物淹没条件下,很难用统一的函数描述平均流速沿水深的分布,植物层上部和内部与顶部处的流速偏离有随淹没度、密度的增大而增大的规律,相同宽深比条件下,含淹没植物明渠和无植物明渠相比,最大流速位置前者高于后者,植物“抬高床面”或是减小了有效宽深比的作用. |
| 关键词: 植物 明渠流速分布 非淹没 淹没 |
| DOI： |
| 分类号:TV131 |
| 基金项目:国家自然科学基金资助项目(50879019); 教育部博士点基金资助项目(200802940001); 中央高校基本科研业务费专项资金资助(2010B02214); 江苏省333科研项目(2017-B08038); 河海大学自然科学基金资助项目(2008426411) |
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| Experimental study on the influence of vegetationon the velocity distribution of open channel flows |
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YAN Jing1,TANG Hong-wu1,TIAN Zhi-jun2,HE Ye2
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YAN Jing1,2,3,TANG Hong-wu1,TIAN Zhi-jun1,HE Ye1,2(1.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Nanjing 210098,China,2.College of Water Conservancy and Hydropower,Hohai University,3.National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety,China)
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| Abstract: |
| Vegetation is an important feature of natural rivers.Based on the flume experiments with aluminum cylinders simulating rigid vegetation and the laser Doppler velocimetry,the influences of vegetation submergence and density on the velocity distribution are investigated in this study.The analyses indicate that the mean streamwise velocity can be expressed by a function of flow discharge,channel width,water depth and vegetation density for non-submerged vegetated flows.For submerged cases,it is difficult to fi... |
| Key words: vegetation velocity distribution of open channel folw non-submerged submerged |
