河道含淹没刚性植物二维涡量场特性  

Characateristics of 2D-vortex field in open channel flow with submerged rigid vegetation

作　　者：吴福生[1,2] 姜树海[1,2] 杨雪林[1,3] 

机构地区：[1]水文水资源及水利工程科学国家重点实验室,南京210098 [2]南京水利科学研究院,南京210029 [3]河海大学水利水电工程学院,南京210098

出　　处：《水动力学研究与进展（A辑）》2010年第1期8-15,共8页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金项目(50879019)资助

摘　　要：含植物水流的涡量场构成了水生动物生境的物理基础,形成水、物质的循环以及能量的分配过程。本文通过玻璃水槽试验用二维标准PIV测量研究了含淹没刚性植物二维垂直涡量场的分布,得出流速梯度是形成含植物水流涡量的关键因素。植物顶层附近对水流的干扰大,因而流速梯度大;涡量最大值出现在淹没刚性植物顶层以下约30%处;植物顶层处,涡量绝对值大,拟熵大,能量耗散率也高。植物顶层是造成水流紊动耗散的主要原因。The vortex field composes physics base for aquatic environment.It forms the cycles of water,substance and affects the process of energy distribution.The two dimensional vertical vortex of water flow with submerged rigid vegetation was studied by PIV in water flume test.The velocity grads distribution is the main factor of water flow vortex creation with vegetation.The flow disturbance is very large near the top of submerged rigid vegetation,so that the velocity grad is large.And the maximum vortex value is occurred under the top layer at about 30% of the relative vegetation height.Near the top area,the absolute value of vorticity is large,the imitate entropy is large too,and the energy dissipation rate is large too.The top area of submerged rigid vegetation is the main factor of turbulent diffusion.

关 键 词：淹没刚性植物 流速梯度 涡量场 拟熵 能量耗散率 紊动扩散 

分 类 号：TV14[水利工程—水力学及河流动力学]