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含挺水植物和沉水植物水流紊动特性

王忖, 王超

王忖, 王超. 含挺水植物和沉水植物水流紊动特性[J]. 水科学进展, 2010, 21(6): 816-822.
引用本文: 王忖, 王超. 含挺水植物和沉水植物水流紊动特性[J]. 水科学进展, 2010, 21(6): 816-822.
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WANG Cun, WANG Chao. Turbulent characteristics in open-channel flow with emergent and submerged macrophytes[J]. Advances in Water Science, 2010, 21(6): 816-822.
Citation: WANG Cun, WANG Chao. Turbulent characteristics in open-channel flow with emergent and submerged macrophytes[J]. Advances in Water Science, 2010, 21(6): 816-822.
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含挺水植物和沉水植物水流紊动特性

  • 1.

    浅水湖泊综合治理与资源开发教育部重点实验室, 江苏, 南京, 210098;

  • 2.

    河海大学力学与材料学院, 江苏, 南京, 210098;

  • 3.

    河海大学环境学院, 江苏, 南京, 210098

基金项目: 国家重点基础研究发展计划(973)资助项目(2008CB418203);浅水湖泊综合治理与资源开发教育部重点实验室资助(2008KJ004)
详细信息
    作者简介:

    王忖(1974- ),女,河北辛集人,讲师,主要从事流体力学研究.E-mail:Wangcun5158@sina.com

  • 中图分类号: TV133

Turbulent characteristics in open-channel flow with emergent and submerged macrophytes

  • 1.

    Ministry of Education Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Nanjing 210098, China;

  • 2.

    College of Mechanics and Materials, Hohai University, Nanjing 210098, China;

  • 3.

    College of Environment, Hohai University, Nanjing 210098, China

Funds: The study is financially supported by the National Basic Research Program of China(No.2008CB418203).

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    摘要
  • 摘要: 在一定的水动力条件下,不同水生植物对水流结构改变的程度及对底泥再悬浮的影响由于其形态结构的差异有所不同.在玻璃水槽中铺设太湖底泥并种植天然沉水植物(水蕨)和挺水植物(菖蒲),通过水槽实验,用三维声学多普勒流速仪ADV对植物段紊流特性进行测量研究,分析含水生植物明渠水流的水力特性及底泥再悬浮规律.结果表明:含沉水植物和挺水植物明渠水流的垂向流速分布各自遵循不同的规律;其紊动强度和雷诺应力具有明显的各向异性特性;在沉水植物冠层交界处及挺水植物的茎杆和枝叶分叉处,紊流强度及雷诺应力均出现最大值;在一定条件下沉水植物和挺水植物均能抑制底泥再悬浮,但当雷诺数达到一定数值时,水生植物的存在反而加剧了底泥的再悬浮,与挺水植物相比,沉水植物对底泥再悬浮的抑制效果要更好.
    Abstract: Under certain hydrodynamic conditions,different species of aquatic plants will have different impacts on the flow structure and sedmient re-suspension due to the differences in plant morphology.In this study,the sediment collected from the Taihu Lake is placed in a glass tank planting with emergent and submerged macrophytes calam us and water fern.Using the flume expermients,the turbulent flow in the open channel with macrophytes is measured by a three-dmiensional Acoustic Doppler Velocmieter(ADV).The analysis of flow turbulence and sediment re-suspension is conducted.The results show that the vertical velocity distribution has different regularities in open-channel flow with emergent and submerged mcrophytes.Both turbulence intensity and Reynolds Number exhibit obvious anisotropy,and their maximum values are found to be at the junction of submerged plant canopy and at the bifurcation of emergent plant stems and branches,respectively.The sedmient re-suspension process can be inhibited by the presence of emergent and submerged macrophytes under certain conditions.However,when the Reynolds Number reaches a certain value,the presence of these macrophytes can actually exacerbate the sedmient resuspension process.In comparison with emergent plants,submerged mcrophytes would be more effective ininhib iting sedi ent re-suspension.
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    • 参考文献(16)
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出版历程
  • 收稿日期:  2010-01-31
  • 刊出日期:  2010-11-24

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