Decaying Scalars Emitted By A Forest Canopy: A Numerical Study
Decaying Scalars Emitted By A Forest Canopy: A Numerical Study
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森林树冠发出的衰变标量：一项数值研究
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
P. Sullivan
中科院分区：
文献类型：
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作者：
E. Patton;K. Davis;M. Barth;P. Sullivan
一个大涡模拟修改，包括由植物冠层发射的多个标量。这些标量中的每一个都受到不同速率的化学损失。本文详细地比较了保存物种和经历一级和二级化学损失物种的平均混合比、混合比方差和垂直混合比通量的剖面，揭示了化学反应性的影响。通过冠层的深度分布的thescale源被示出，以本地reducethe反应速率为二级物种。传输效率，diffusioncoefficients，和平均源高度也表现出化学dependency.Budgets的混合比方差和通量阐明的机制，通过化学修改每一个。瞬时场显示了间歇性相干结构的存在，这种相干结构被认为可以增强物种的分离。
A large-eddy simulation is modified to include multiple scalars emitted by a plant canopy. Each of these scalars is subjected to varying rates of chemical loss. Presented is a detailed comparison between conservedspecies and species undergoing first- and second-order chemical loss.Profiles of mean mixing ratio, mixing-ratio variance and vertical mixing-ratio flux reveal the influence of chemical reactivity. Distribution of thescalar source through the depth of the canopy is shown to locally reducethe reaction rate for second-order species. Transport efficiencies, diffusioncoefficients, and mean source heights also exhibit chemical dependencies.Budgets of mixing-ratio variance and flux elucidate the mechanisms throughwhich chemistry modifies each. Instantaneous fields show the existence ofintermittently occurring coherent structures that are thought to enhancespecies segregation.