Instability Analysis of Terrain-Induced Canopy Flows

Tall vegetation and complex terrain create difficult conditions for measuring and modeling net ecosystem-atmosphere exchanges of carbon, water vapor, and pollutants. The instability of canopy flow regimes over complex terrain is critical for understanding what factors are essential to control exchan...

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Bibliographic Details
Published inJournal of the atmospheric sciences Vol. 66; no. 7; pp. 2134 - 2142
Main Author Yi, Chuixiang
Format Journal Article
LanguageEnglish
Published Boston, MA American Meteorological Society 01.07.2009
Subjects
Atmosphere
Atmospheric boundary layer
Buoyancy
Canopies
Criteria
Earth, ocean, space
Exact sciences and technology
Exchange
External geophysics
Instability
Mathematical models
Meteorology
Organization theory
Physics of the high neutral atmosphere
Research methodology
Stability
Terrain
Vegetation
Flow regime
Complex terrain
water vapor
instability
vegetation
Modeling
Drag coefficient
stability
Canopy(vegetation)
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Summary:Tall vegetation and complex terrain create difficult conditions for measuring and modeling net ecosystem-atmosphere exchanges of carbon, water vapor, and pollutants. The instability of canopy flow regimes over complex terrain is critical for understanding what factors are essential to control exchanges between different canopy flow regimes. In this paper, an analytical criterion of instability of the terrain-induced canopy flows is derived from the simplified thermal-hydromechanical equations by nonlinear instability analysis. The stability of the terrain-induced canopy flows and an oscillation solution are predicted based on the instability criterion. It is found that the critical values of control parameters are determined by the terrain slope, drag coefficient, and leaf area density of vegetation.
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ISSN:0022-4928
1520-0469
DOI:10.1175/2009JAS3005.1