Constructing wind profiles in forests from limited measurements of wind and vegetation structure
Constructing wind profiles in forests from limited measurements of wind and vegetation structure
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DOI：
10.1016/j.agrformet.2010.01.012
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发表时间：
2010-05
影响因子：
6.2
通讯作者：
Ronald Queck;C. Bernhofer
中科院分区：
文献类型：
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作者：
Ronald Queck;C. Bernhofer
CarboEurope-IP（CEIP）内的平流倡议ADVEX的目的是评估平流对三个针叶林站点的重要性。计算CO2平衡平流项的前提和关键是风场的构造假设。风的测量必须在复杂的控制体积上进行插值。在这里，植物面积密度被确定为一个关键变量。在ADVEX活动期间，矩形控制体积由四个角落的塔标记，每个塔在体积高度（高达30米）上携带四个声波风速计。在CEIP森林站点Tharandter Wald设计了另一个实验，以调查仅在四个测量水平之间插值所产生的误差。13个声波风速计安装在一个高达42米的塔上（树冠高度为30米）。此外，植物面积密度分布进行了测量，以获得植物特定的风廓线参数化。风速矩和无量纲风速梯度的轮廓作为风场的基本特征进行了讨论。提出了一种新的基于混合长度方法的参数化方案。该模型与高分辨率的数据进行了验证，并应用于计算水平平流的ADVEX网站。除了改进插值程序外，该模型还提供了减少计算冠层内风场所需的大型塔架数量的机会。
The aim of the advection initiative ADVEX within CarboEurope-IP (CEIP) was to evaluate the importance of advection on three coniferous sites. A prerequisite and crucial point for calculating the advective terms of CO2balance are the assumptions for the construction of wind fields. Wind measurements must be interpolated over complex control volumes. Here the plant area density is identified as a key variable. During ADVEX campaigns, the rectangular control volumes were marked by four towers at the corners, each carrying four sonic anemometers over the volume height (up to 30m). An additional experiment was designed at the CEIP forest site Tharandter Wald to investigate the error made by interpolation between only four measurement levels. Thirteen sonic anemometers were installed on one tower up to a height of 42m (canopy height is 30m). In addition, plant area density profiles were measured to derive plant-specific parameterisation of the wind profiles. Profiles of velocity moments and nondimensional wind speed gradients are discussed as basic characteristics of the wind field. A new parameterisation scheme based on the mixing length approach was developed. The model was validated with the high-resolution data and applied to calculate horizontal advection for the ADVEX sites. In addition to improving the interpolation routine, this model provides the opportunity to reduce the number of large towers needed to calculate in-canopy wind fields.