柔性沉水植物生长对含沙水流紊动特性的影响  

Influence of Growth of Flexible Submerged Plants on Turbulence Characteristics of Sediment-laden Flow

作　　者：李君宁[1] 杨具瑞[1] 罗晶[2] 程浩亮[1] 柏绍光[3] 

机构地区：[1]昆明理工大学电力工程学院水利水电工程系,云南昆明650051 [2]四川大学水力学及山区河流开发保护国家重点实验室,四川成都610065 [3]云南省水文水资源局昆明分局,云南昆明650051

出　　处：《湿地科学》2012年第4期445-450,共6页Wetland Science

基　　金：水利部科研专项项目(201101042);国家自然科学基金项目(50769001)资助

摘　　要：采用装饰塑料树在实验水槽中模拟柔性沉水植物,在一定水力条件下,探讨了柔性沉水植物生长对含沙水流紊动特性和悬移质含量分布规律的影响。实验结果表明,柔性沉水植物带中含沙水流垂向流速分布不符合无植物时的半对数分布形式。柔性沉水植物带中含沙水流纵向、横向和垂向的紊动强度和雷诺应力呈各向异性,且其最大值和最大值的位置随柔性沉水植物高度的增加而增大。植物带中垂向悬移质含量随着柔性沉水植物高度的增加而降低,沿柔性沉水植物带水流方向悬移质含量逐渐降低。The influence of the growth of submerged flexible plants on turbulence characteristics of sediment-laden flow and distribution law of suspended sediment concentration were discussed through flume experiment under a certain hydraulic condition in which plastic trees were chosen to simulate submerged flexible plants.The experiment results showed that the vertical velocity distribution of sediment-laden flow in the zones in which submerged flexible plants are growing was not consistent with semi-logarithm distribution law without plants.The turbulent intensity and Reynolds stress in longitudinal,transversal and vertical directions of sediment-laden flow in the zones with submerged flexible plants were showed an anisotropic tendency,and meanwhile the location of the maximums of turbulent intensity and Reynolds stress raised with the increase of plant height.The vertical concentration of suspended sediments decreased with the increase of plant height and along the flow direction suspended sediments concentration gradually decreased.

关 键 词：植物生长 流速 紊动强度 雷诺应力 悬移质含量 

分 类 号：TV131.65[水利工程—水力学及河流动力学]