DOI: 10.1016/j.atmosenv.2014.06.058
Scopus记录号: 2-s2.0-84903772087
论文题名: Effect of vegetative canopy architecture on vertical transport of massless particles
作者: Bailey B ; N ; , Stoll R ; , Pardyjak E ; R ; , Mahaffee W ; F
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 95 起始页码: 480
结束页码: 489
语种: 英语
英文关键词: Lagrangian particle dispersion model
; Large-eddy simulation
; Persistence time
; Residence time
; Sparse canopy
; Vineyard
Scopus关键词: Differential equations
; Lagrange multipliers
; Large eddy simulation
; Lagrangian particle dispersion model
; Persistence time
; Residence time
; Sparse canopy
; Vineyard
; Transport properties
; atmospheric modeling
; atmospheric particle
; atmospheric transport
; canopy architecture
; dispersion
; Lagrangian analysis
; large eddy simulation
; particle motion
; persistence
; residence time
; vertical movement
; vineyard
; airflow
; article
; atmospheric dispersion
; canopy
; controlled study
; density
; geometry
; large eddy simulation
; leaf area
; mathematical model
; motion
; particle size
; particulate matter
; priority journal
; simulation
; statistical model
; vegetation
; vineyard
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Large-eddy simulations of approximately resolved heterogeneous vegetative canopies with repeating row structure were compared to 'equivalent' homogeneous simulations to explore how overall canopy density and horizontal heterogeneity influence the vertical transport of non-depositing massless fluid parcels. A Lagrangian approach was used to quantify particle dispersion. The subgrid component of particle motion was modeled with a Langevin equation that was integrated with a new semi-implicit scheme that successfully minimized rogue trajectories. With rogue trajectories controlled, the subgrid model had a negligible impact on average statistics. Analysis suggested that above the canopy top, canopy density and heterogeneity had a minor effect on mean profiles of particle concentration and vertical flux. However, increasing canopy density resulted in a linear increase in particle residence time, and increased the importance of release height on canopy escape. The average time of persistent vertical particle motions did not follow this monotonic trend. For sufficiently dense canopies, the time scale of persistent vertical motions increased with decreasing canopy density in agreement with mixing-layer scaling. As wall shear became significant, a transition was observed in which persistence decreased with decreasing canopy density. The effect of canopy heterogeneity on residence time and persistence was well correlated with the strength of dispersive fluxes. Canopy heterogeneity decreased the average time for a particle to escape the canopy, and also reduced the coherence of vertical particle motions. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81276
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Mechanical Engineering, University of Utah, Salt Lake City, UT, United States; U. S. Department of Agriculture - Agriculture Research Service, Horticulture Crops Research Laboratory, Corvallis, OR, United States
Recommended Citation:
Bailey B,N,, Stoll R,et al. Effect of vegetative canopy architecture on vertical transport of massless particles[J]. Atmospheric Environment,2014-01-01,95