DOI: 10.1029/2018JD028397
Scopus记录号: 2-s2.0-85052369433
论文题名: Wind Dynamics Over a Highly Heterogeneous Oasis Area: An Experimental and Numerical Study
作者: Liu R. ; Liu S. ; Yang X. ; Lu H. ; Pan X. ; Xu Z. ; Ma Y. ; Xu T.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 16 起始页码: 8418
结束页码: 8440
语种: 英语
英文关键词: aerodynamic roughness length
; computational fluid dynamics
; ground measurements
; micrometeorology
; remote sensing
; wind dynamics
英文摘要: Oases are unique heterogeneous landscapes that coexist within the Gobi desert in the arid and semiarid regions, which are vital for agricultural production and economic development. The heterogeneity of the land surface with vegetation will significantly influence the wind dynamics and airflow characteristics. The current study utilized an integrated approach, combining the computational fluid dynamics (CFD) method with the k-ɛ turbulence model and high-resolution ground-measurement data to analyze the wind dynamics over an oasis. Specifically, (1) the Weather Research and Forecast model (WRF) data were used as boundary conditions to initiate the simulations; (2) the canopy leaf area density estimated from airborne laser scanning data was added as the source terms of the momentum and turbulence transport equations, which represented the highly heterogeneous vegetation structures in the oasis area. CFD-simulated wind field results agreed well with the flux observation matrix data (17 tower measurements in a 5.5 km × 5.5 km experimental area). The spatial and temporal variations of wind fields affected by heterogeneous land surfaces were successfully captured. The CFD-simulated wind fields also clearly showed the “wind shield effect” over highly heterogeneous land surfaces, wherein the existence of shorter and longer wind speed reduction areas at the windward and leeward sides of the shelterbelts contribute to protecting farmlands and orchards from wind erosion. In addition, the current approach of estimating aerodynamic roughness length (z0m) based on high-resolution CFD-simulated wind profiles was demonstrated to be a promising method of capturing wind dynamics over heterogeneous surfaces. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113235
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing, China; Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing, China; Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China; Department of Geography, Handan College, Handan, China
Recommended Citation:
Liu R.,Liu S.,Yang X.,et al. Wind Dynamics Over a Highly Heterogeneous Oasis Area: An Experimental and Numerical Study[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(16)