Measurements of velocity and trajectory of water particle for internal waves in two density layers
Measurements of velocity and trajectory of water particle for internal waves in two density layers
复制标题
两个密度层中内波水粒子速度和轨迹的测量
DOI：
10.1029/2010gl046419
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
S. Matsuki
中科院分区：
文献类型：
--
作者：
M. Umeyama;S. Matsuki
本文用粒子图像测速法（PIV）讨论了在恒定水深的两层流体系统中传播的内波动力学。在一个波周期的几个阶段估计了实验速度矢量场及其分量的垂直分布，并与基于三阶Stokes内波理论的相应预测进行了比较。这些尝试证明，PIV技术能够以相当的精度测量非线性内波引起的空间流速。将该方法应用于水粒子路径的跟踪。将实测轨迹与在泰勒级数展开中对欧拉速度进行高阶积分得到的粒子位置进行了比较。
This article discusses the kinetics of internal waves, which propagate in a two‐layer fluid system having a constant water depth, using particle image velocimetry (PIV). The experimental vector field of velocity and vertical distributions of its components were estimated at several phases in one wave cycle and compared with the corresponding predictions on the basis of third‐order Stokes internal‐wave theory. These attempts proved that the PIV technique enables the measurement of water velocity spatially induced by the nonlinear internal waves with considerable accuracy. This method was applied to trace water particle path. The measured trajectory was compared with the particle positions obtained theoretically by integrating the Eulerian velocity to a higher order in a Taylor series expansion.