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| DOI：10.13522/j.cnki.ggps.2019040 |
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| Experimental study on flow structure of open channels with rigid submerged plants |
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WANG Zijian, DING Xue, JI Qingfeng
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College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China
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| Abstract: |
| 【Objective】This study is to explore the flow structure of open channel with rigid submerged plants.【Method】The flow structure of open channel was studied under different inflow and plant density conditions using particle image velocimeter (PIV) and plexiglass rod to simulate rigid plants.【Result】It was found that the average velocity distribution along the vertical line was logarithmic in the absence of plants, while it showed obvious zonal distribution in the presence of plants. The intensity of turbulence did not change much in the direction of water depth when there was no plant, but the turbulence was most intense in the canopy when there were plants. The greater the flow rate or plant density, the greater the velocity gradient at the canopy and the maximum velocity above the plant layer were. The greater the plant density, the greater the turbulence intensity were in the canopy. The plant density had a great influence on the region where the turbulence intensity decreased from the maximum to the minimum.【Conclusion】The existence of rigid submerged plants will change the flow structure, enhance turbulent mixing, enhance fluid particle exchange and energy transfer, and these effects will increase with the flow or plant density. |
| Key words: rigid submerged plant; open channel flow; flow structure; experimental study |
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