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首页> 外文期刊>Berichte des Meteorologischen Institutes der Universitat Freiburg >Modelling forest canopy motion using a porous elastic approach
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Modelling forest canopy motion using a porous elastic approach

机译：使用多孔弹性方法模拟林冠运动

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摘要

In order to investigate the possibility of modelling plant motion at the landscape scale, an equa-tion for canopy plant motion, forced by the instantaneous wind flow, is introduced in a large-eddy simulation (LES) airflow model, previously validated over homogeneous and heterogene-ous canopies. The canopy is simply represented as a poroelastic continuous medium, which issimilar in its discrete form to an infinite row of identical stems. In a first step only one linearmode of plant vibration is considered. The two-way coupling between plant motion and thewind flow occurs through the drag force term. This coupled model is validated against data re-corded over an alfafa canopy, whose motions have been analysed elsewhere in great detailsfrom video recordings. It is shown that the modelis able to reproduce the well-known phe-nomenon of honami. The model is then extended to a forest canopy using the first flexible vi-bration mode, and compared to the previous model and a finite-element model of a tree. Thesimplified models are shown to be as efficient as the finite-element model. Finally, the possibil-ity of using such a porous elastic approach for studying forest canopy motion at landscape scaleis discussed.
机译：为了研究在景观尺度上对植物运动进行建模的可能性，在大涡流模拟（LES）气流模型中引入了由瞬时风流推动的冠层植物运动方程，该模型先前已通过均质和模拟验证。异质树冠。冠层简单地表示为多孔弹性连续介质，其离散形式类似于无限长的相同茎杆。第一步，仅考虑植物振动的一种线性模式。植物运动与风流之间的双向耦合通过阻力项进行。该耦合模型针对在苜蓿冠层上记录的数据进行了验证，该冠层的运动已在其他地方从视频记录中进行了详细分析。结果表明，该模型能够重现著名的“ honami”现象。然后使用第一种灵活的振动模式将模型扩展到林冠层，并与先前的模型和树木的有限元模型进行比较。简化的模型显示出与有限元模型一样有效。最后，讨论了使用这种多孔弹性方法研究景观尺度上的森林冠层运动的可能性。

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