• 关键词：平面激光诱导荧光  污染物  浓度场  淹没度  植被水流  明渠流

• 基金项目：国家自然科学基金（No.51679191）陕西省自然科学基金（No.2019JLM-60）

• 任姗
• 1. 西安理工大学, 省部共建西北旱区生态水利国家重点实验室, 西安 710048;2. 陕西省水利电力勘测设计研究院, 西安 710001

• 冯民权
• 西安理工大学, 省部共建西北旱区生态水利国家重点实验室, 西安 710048

• 摘要：利用平面激光诱导荧光（PLIF）技术对含柔性淹没植被明渠污染物浓度场进行试验研究.固定排污口于植被顶部，分析不同淹没度、不同植被密度下含植被水流浓度场的扩散规律.试验结果表明，随着淹没度的增加，污染物浓度沿流向下降变快，完全混合所需距离缩短；随着植被密度的增加，污染物浓度沿流向下降变快，完全混合所需距离缩短.随着淹没度的增加，垂向浓度半宽比横向浓度半宽大，垂向上的标量输移占主导地位.

• Abstract：In this study, plane laser-induced fluorescence (PLIF) technology was used to investigate the pollutant concentration field in open channels with flexible submerged vegetation. A sewage outlet was fixed at the top of the vegetation, and the diffusion of the concentration field for the vegetation-containing water flow under different inundation degrees and different vegetation densities was analyzed. The test results showed that as the submergence increased, the pollutant concentration decreased along the flow direction, and the distance required for complete mixing decreased. As the vegetation density increased, the pollutant concentration also decreased along the flow direction, and the distance required for complete mixing also decreased. In addition, as the submergence increased, the vertical concentration half-width was larger than the lateral concentration half-width, and the vertical scalar transport was dominant.

• Key words：planar laser-induced fluorescence  pollutants  concentration field  submergence  vegetation flow  open channel flow

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