气候变化领域集成服务门户(CCPortal): The Effects of Canopy Morphology on Flow Over a Two-Dimensional Isolated Ridge

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DOI	10.1029/2020JD033027
	The Effects of Canopy Morphology on Flow Over a Two-Dimensional Isolated Ridge
	Ma Y.; Liu H.; Banerjee T.; Katul G.G.; Yi C.; Pardyjak E.R.
发表日期	2020
ISSN	2169897X
卷号	125 期号:19
英文摘要	Momentum and mass exchanges between the atmosphere and forests situated on complex terrain continue to draw significant research attention primarily because of their significance to a plethora of applications. In this paper, we investigated flows behavior on the leeward side of a two-dimensional forested ridge under neutrally stratified conditions using large-eddy simulations (LESs). The goal is to understand how variations in leaf area index (LAI), vertical canopy foliage distributions, and forest edge positions affect mean/turbulent flow statistics, momentum fluxes, and onset of recirculation patterns. Although pressure perturbations are dominated by the hill shape, it is demonstrated here that changes in canopy foliage distribution modulate intensities and patterns of the leeward adverse pressure gradients. Such changes in the adverse pressure gradients alter the mean velocity streamlines including the patterns and magnitudes of the leeward downward mean vertical velocity and the velocity variances and momentum flux in the wake region. While a downwind recirculation zone develops in all cases, the details regarding the incipient location and recirculation zone size vary including positions of the separation and reattachment points. Furthermore, changes in the strength and depth of the zone occur due to canopy-induced changes in adverse pressure gradients, advection, and canopy drag. Because the recirculation zone impacts the local mean advective terms in momentum and scalar exchanges, the simulations here indicate that canopy morphology-induced changes in the leeward flows have significant implications to both measurements and models of biosphere-atmosphere exchange over complex terrain. ©2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185717
作者单位	Department of Civil and Environmental Engineering, Washington State University, Pullman, WA, United States; Department of Civil and Environmental Engineering, University of California, Irvine, CA, United States; Nicholas School of the Environment and Department of Civil and Environmental Engineering, Duke University, Durham, NC, United States; School of Earth and Environmental Sciences, Queens College, City University of New York, New York, NY, United States; Department of Mechanical Engineering, University of Utah, Salt Lake City, UT, United States
推荐引用方式 GB/T 7714	Ma Y.,Liu H.,Banerjee T.,et al. The Effects of Canopy Morphology on Flow Over a Two-Dimensional Isolated Ridge[J],2020,125(19).
APA	Ma Y.,Liu H.,Banerjee T.,Katul G.G.,Yi C.,&Pardyjak E.R..(2020).The Effects of Canopy Morphology on Flow Over a Two-Dimensional Isolated Ridge.Journal of Geophysical Research: Atmospheres,125(19).
MLA	Ma Y.,et al."The Effects of Canopy Morphology on Flow Over a Two-Dimensional Isolated Ridge".Journal of Geophysical Research: Atmospheres 125.19(2020).