摘要
含植物水流的涡量场构成了河漫滩湿地水生物生境的物理基础,形成水、营养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测量研究了含淹没柔性植物二维垂直涡量场的分布。研究表明:流速梯度是形成含植物水流涡量的关键因素,水流过植物冠层附近受到的干扰大,因而流速梯度大;涡量最大值出现在淹没柔性植物冠层以下约50%处;植物冠层处,涡量绝对值大,拟熵大,能量耗散率也高。植物冠层是造成水流紊动耗散的主要原因。
The two dimensional vertical vortex of flow over flood plain with submerged flexible vegetation were studied by using PIV in flume test. The velocity gradient is the main factor affecting the vortex formed by vegetation. The flow disturbance is very large near the coronal region of submerged flexible vegetation, and resulted in significant velocity gradient. The maximum vortex occurred at the layer about 50% of the relative vegetation height. At the vicinity of coronal layer, the absolute value of vortex is large, the imitate entropy is high, and the energy dissipation rate is large. The coronal layer of submerged flexible vegetation is the major factor affecting the turbulent diffusion.
出处
《水利学报》
EI
CSCD
北大核心
2010年第12期1469-1475,共7页
Journal of Hydraulic Engineering
关键词
涡量场
河漫滩
湿地
淹没柔性植物
流速梯度
拟熵
能量耗散率
紊动扩散
vortex field
floodplains
wetland
submerged flexible vegetation
velocity grads
imitate entropy
energy dissipation rate
turbulent diffusion
作者简介
吴福生（1963-），男，安徽池州人，高级工程师，主要从事水工水力学及环境水力学研究。E—mail：fswu8223@126．com
