Wind fields in heterogeneous conifer canopies: parameterisation of momentum absorption using high-resolution 3D vegetation scans
Wind fields in heterogeneous conifer canopies: parameterisation of momentum absorption using high-resolution 3D vegetation scans
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异质针叶树冠层中的风场：使用高分辨率 3D 植被扫描对动量吸收进行参数化
DOI：
10.1007/s10342-011-0550-0
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发表时间：
2011
影响因子：
2.8
通讯作者：
C. Bernhofer
中科院分区：
文献类型：
--
作者：
Ronald Queck;A. Bienert;H. Maas;Stefan Harmansa;V. Goldberg;C. Bernhofer
流模型的应用，高大的植物冠层是有限的，除其他因素外，缺乏详细的信息，植被结构。本文提出了一种记录三维植被结构的方法，并使这种信息适用于推导适用于水流模型的湍流参数。在东灵山下半部分针叶混交林中，对风速、阻力系数（CD）和植物面积密度（PAD）之间的关系进行了实验研究。通过收集多层次高频风速测量数据收集了基本信息，并从地面激光扫描仪数据中获得了森林的密集三维表示。在大多数风向下观察到风速依赖性或流线型。边缘效应，即这里不考虑的压力梯度和动量方程的平流项的影响，被认为是造成这种不均匀性。与假设的遮蔽效应相反，遮蔽效应会减少遮蔽植物部分的阻力，计算的阻力系数曲线显示随着PAD（即对冠层和植物结构的依赖）CD增加。
Applications of flow models to tall plant canopies are limited, amongst other factors, by the lack of detailed information on vegetation structure. A method is presented to record 3D vegetation structure and make this information applicable to the derivation of turbulence parameters suitable for flow models. The relationship between wind speed, drag coefficient (CD) and plant area density (PAD) was experimentally investigated in a mixed conifer forest in the lower part of the Eastern Ore Mountains. Essential information was gathered by collecting multi-level high-frequency wind velocity measurements and a dense 3D representation of the forest was obtained from terrestrial laser scanner data. Wind speed dependence or streamlining was observed for most of the wind directions. Edge effects, i.e. the influence of the here not regarded pressure gradient and the advective terms of the momentum equation, are assumed to cause this heterogeneity. Contrary to the hypothetic shelter effect, which would reduce the drag on sheltered plant parts, the calculated profiles of drag coefficients revealed an increasing CD with PAD (i.e. a dependence on canopy and plant structure).