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沉水植被降低水体浊度的机理研究

庞翠超 吴时强 赖锡军 武 迪

庞翠超, 吴时强, 赖锡军, 武 迪. 沉水植被降低水体浊度的机理研究[J]. 环境科学研究, 2014, 27(5): 498-504. doi: 10.13198/j.issn.1001-6929.2014.05.07
引用本文: 庞翠超, 吴时强, 赖锡军, 武 迪. 沉水植被降低水体浊度的机理研究[J]. 环境科学研究, 2014, 27(5): 498-504. doi: 10.13198/j.issn.1001-6929.2014.05.07
PANG Cui-chao, WU Shi-qiang, LAI Xi-jun, WU Di. Water Flow with Submerged Vegetation and Its Effect on Water Turbidity[J]. Research of Environmental Sciences, 2014, 27(5): 498-504. doi: 10.13198/j.issn.1001-6929.2014.05.07
Citation: PANG Cui-chao, WU Shi-qiang, LAI Xi-jun, WU Di. Water Flow with Submerged Vegetation and Its Effect on Water Turbidity[J]. Research of Environmental Sciences, 2014, 27(5): 498-504. doi: 10.13198/j.issn.1001-6929.2014.05.07

沉水植被降低水体浊度的机理研究

doi: 10.13198/j.issn.1001-6929.2014.05.07
基金项目: 国家自然科学基金项目(41071021);国家重点基础研究发展计划(973)项目(2012CB417000);国家水体污染控制与治理科技重大专项(2012ZX07506-003-04)

Water Flow with Submerged Vegetation and Its Effect on Water Turbidity

  • 摘要: 水体浊度的变化影响着水生态系统的健康,而沉水植被对降低水体浊度具有显著效果. 为明确沉水植物对泥沙的作用机理,以苦草为试验用草,开展室内水槽试验. 结果表明,苦草斑块降低了水流的输沙能力,根据试验资料估算,斑块区水流的输沙能力仅约为无草时的10%. 利用象限分析法分析了实测的紊动流场,解释了植物对泥沙作用的物理过程. 在苦草斑块区,植物冠顶以下区域(相对高度小于1.00)为下扫流态,紊动漩涡形成的下扫流将泥沙带入水底,而近底层的喷射流抵消了下扫流的能量,抑制下扫流对泥沙的冲击起动,并使下扫流挟带的泥沙顺利淤积;在植物冠顶以上区域除高密度(172株/m2)工况为下扫流态外,中、低密度(86、43株/m2)工况均为喷射流态,不利于泥沙沉降. 由于泥沙主要存在于下层水体,因此沉水植被有利于减小水体浊度.

     

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出版历程
  • 收稿日期:  2013-06-02
  • 修回日期:  2014-01-26
  • 刊出日期:  2014-05-25

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