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首页> 外文期刊>European Journal of Forest Research >Wind fields in heterogeneous conifer canopies: parameterisation of momentum absorption using high-resolution 3D vegetation scans
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Wind fields in heterogeneous conifer canopies: parameterisation of momentum absorption using high-resolution 3D vegetation scans

机译：异类针叶林冠层中的风场：使用高分辨率3D植被扫描对动量吸收进行参数化

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摘要

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 (C D ) 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 C D with PAD (i.e. a dependence on canopy and plant structure).
机译：由于缺少有关植被结构的详细信息，流模型在高大植物冠层中的应用受到限制。提出了一种方法来记录3D植被结构并使该信息适用于适用于流动模型的湍流参数的推导。在东部矿石山脉下部的一个针叶树混交林中，通过实验研究了风速，风阻系数（C D ）与植物面积密度（PAD）之间的关系。通过收集多级高频风速测量值收集了基本信息，并从陆地激光扫描仪数据中获得了森林的密集3D表示。在大多数风向中都观察到风速依赖性或流线型。边缘效应，即此处未考虑的压力梯度和动量方程的对流项的影响，被认为是造成这种异质性的原因。与假想的遮蔽效应相反，后者会减少对遮蔽的植物部位的阻力，计算得出的阻力系数曲线表明，PAD会增加C D （即对冠层和植物结构的依赖性）。

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