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    Gravity Waves in a Forest: A Linear Analysis

    Source: Journal of the Atmospheric Sciences:;1997:;Volume( 054 ):;issue: 021::page 2574
    Author:
    Lee, Xuhui
    DOI: 10.1175/1520-0469(1997)054<2574:GWIAFA>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Wavelike oscillations are a common form of air motion in the forest canopy at night. This paper investigates the canopy wave phenomenon using a two-dimensional inviscid linear wave model taking into account the drag force exerted on the wave wind components by plant elements and the plant?air heat exchange induced by temperature wave oscillations. The model appears to have adequately reproduced the salient features of a wave event in a boreal aspen forest. The wave dynamics are investigated as functions of parameters of the background states expressed in analytical form. It is shown that canopy waves are generated by wind shear near the treetops and share features of a Kelvin?Helmholtz disturbance. Because it is located close to the inflection point of the mean wind, the ground exerts a strong stabilizing effect on the wave motions, particularly in a sparse forest. The main role of the canopy drag in the wave dynamics is the creation of the inflection point; its damping effect on wave oscillations themselves is limited to disturbances of wavelengths shorter than that of the fastest growing waves. Wavelength, phase speed, and period of the fastest growing waves, those that are most likely to dominate observations, appear insensitive to static stability.
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      Gravity Waves in a Forest: A Linear Analysis

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4158477
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    contributor authorLee, Xuhui
    date accessioned2017-06-09T14:34:43Z
    date available2017-06-09T14:34:43Z
    date copyright1997/11/01
    date issued1997
    identifier issn0022-4928
    identifier otherams-22068.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4158477
    description abstractWavelike oscillations are a common form of air motion in the forest canopy at night. This paper investigates the canopy wave phenomenon using a two-dimensional inviscid linear wave model taking into account the drag force exerted on the wave wind components by plant elements and the plant?air heat exchange induced by temperature wave oscillations. The model appears to have adequately reproduced the salient features of a wave event in a boreal aspen forest. The wave dynamics are investigated as functions of parameters of the background states expressed in analytical form. It is shown that canopy waves are generated by wind shear near the treetops and share features of a Kelvin?Helmholtz disturbance. Because it is located close to the inflection point of the mean wind, the ground exerts a strong stabilizing effect on the wave motions, particularly in a sparse forest. The main role of the canopy drag in the wave dynamics is the creation of the inflection point; its damping effect on wave oscillations themselves is limited to disturbances of wavelengths shorter than that of the fastest growing waves. Wavelength, phase speed, and period of the fastest growing waves, those that are most likely to dominate observations, appear insensitive to static stability.
    publisherAmerican Meteorological Society
    titleGravity Waves in a Forest: A Linear Analysis
    typeJournal Paper
    journal volume54
    journal issue21
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1997)054<2574:GWIAFA>2.0.CO;2
    journal fristpage2574
    journal lastpage2585
    treeJournal of the Atmospheric Sciences:;1997:;Volume( 054 ):;issue: 021
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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