Sweeping Effects Modify Taylor’s Frozen Turbulence Hypothesis for Scalars in the Roughness Sublayer
Sweeping Effects Modify Taylor’s Frozen Turbulence Hypothesis for Scalars in the Roughness Sublayer
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DOI：
10.1029/2021gl093746
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发表时间：
2021-10
影响因子：
5.2
通讯作者：
K. Everard;G. Katul;G. Lawrence;A. Christen;M. Parlange
中科院分区：
文献类型：
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作者：
K. Everard;G. Katul;G. Lawrence;A. Christen;M. Parlange
使用细丝热电偶和超声波风速计的空间阵列在倾斜葡萄园树冠的粗糙子层中研究了泰勒的冷冻湍流假设（FTH）。将椭圆近似（EA）方法应用于测量的时空温度相关函数，以描述平流速度的扫掠效应。扫掠效应主要由湍流动能来解释。在消除扫掠效应后，平流速度被发现是相称的平均速度。
Taylor’s frozen turbulence hypothesis (FTH) is investigated in the roughness sublayer of a sloped vineyard canopy using a spatial array of fine‐wire thermocouples and ultrasonic anemometers. The Ellipse Approximation (EA) method is applied to the measured space‐time temperature correlation function to delineate sweeping effects from advection velocity. Sweeping effects are explained primarily by the turbulence kinetic energy. Upon the removal of sweeping effects, the advection velocity is found to be commensurate with the mean velocity.