| Cite this article: | 王子建,丁雪,吉庆丰.含刚性沉水植物明渠水流结构的试验研究[J].灌溉排水学报,0,():-. |
| wangzijian,dingxue,jiqingfeng.含刚性沉水植物明渠水流结构的试验研究[J].灌溉排水学报,0,():-. |
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| Experimental study on flow structure of open channels with rigid submerged plants |
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wangzijian, dingxue, jiqingfeng
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Yangzhou University
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| Abstract: |
| 【Objective】In order 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 does not change much in the direction of water depth when there are no plants, but the turbulence is most intense in the canopy when there are 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. The greater the plant density, the greater the turbulence intensity in the canopy. The plant density has a great influence on the region where the turbulence intensity decreases 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 increase of flow or plant density. |
| Key words: rigid submerged plant; experimental study; flow structure |
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