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首页> 外文期刊>Trees. Structure and Function >A simple tree swaying model for forest motion in windstorm conditions.
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A simple tree swaying model for forest motion in windstorm conditions.

机译：暴风雨条件下森林运动的简单树摇摆模型。

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摘要

A simple tree swaying model, valid for windstorm conditions, has been developed for the purpose of simulating the effect of strong wind on the vulnerability of heterogeneous forest canopies. In this model the tree is represented as a flexible cantilever beam whose motion, induced by turbulent winds, is solved through a modal analysis. The geometric nonlinearities related to the tree curvature are accounted for through the formulation of the wind drag force. Furthermore, a breakage condition is considered at very large deflections. A variety of case studies is used to evaluate the present model. As compared to field data collected on three different tree species, and to the outputs of mechanistic models of wind damage, it appears to be able to predict accurately large tree deflections as well as tree breakage, using wind velocity at tree top as a forcing function. The instantaneous response of the modelled tree to a turbulent wind load shows very good agreement with a more complex tree model. The simplicity of the present model and its low computational time make it well adapted to future use in large-eddy simulation airflow models, aimed at simulating the complete interaction between turbulent wind fields and tree motion in fragmented forests.
机译：为了模拟强风对非均质林冠层脆弱性的影响，已经开发了一种适用于暴风雨条件的简单树木摇摆模型。在该模型中，树表示为柔性悬臂梁，其湍流引起的运动通过模态分析得以解决。与树木曲率有关的几何非线性是通过风阻力的公式说明的。此外，在非常大的挠度下考虑了断裂条件。各种案例研究用于评估当前模型。与在三种不同树种上收集的野外数据以及风害破坏机理模型的输出相比，它似乎能够准确地预测大树的挠度和树木的破损，并以树顶的风速为强迫函数。建模的树对湍流风荷载的瞬时响应与更复杂的树模型非常吻合。本模型的简单性及其较低的计算时间使其非常适合将来在大涡流模拟气流模型中使用，其目的是模拟零散森林中湍流风场与树木运动之间的完全相互作用。

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