Wave ducting in a stratified shear flow over a two-dimensional mountain. Part II : Implications for the development of high-drag states for severe downslope windstorms

In this study, it is found that the discrepancies among earlier studies of severe downslope windstorms are caused by the use of the critical level height (zc), instead of the low-level uniform flow-layer depth (z1), as an indicator to determine the optimal conditions for the occurrence of high-drag...

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Bibliographic Details
Published inJournal of the atmospheric sciences Vol. 56; no. 3; pp. 437 - 452
Main Authors WANG, T.-A, LIN, Y.-L
Format Journal Article
LanguageEnglish
Published Boston, MA American Meteorological Society 01.02.1999
Subjects
Atmosphere
Earth, ocean, space
Exact sciences and technology
External geophysics
General circulation. Atmospheric waves
Mathematics
Meteorology
Mountains
Simulation
Tides
Uniform flow
Storm
Gravity wave
Wave drag
Shear flow
Theoretical study
Guided wave
Two dimensional flow
Richardson number
Wave breaking
Stratified flow
Atmospheric wave
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Summary:In this study, it is found that the discrepancies among earlier studies of severe downslope windstorms are caused by the use of the critical level height (zc), instead of the low-level uniform flow-layer depth (z1), as an indicator to determine the optimal conditions for the occurrence of high-drag states. It is determined that once the wave breaking occurs, it induces a critical level and establishes a flow configuration favorable for wave ducting in the lower uniform wind layer, which determines the phase of reflected waves.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0022-4928
1520-0469
DOI:10.1175/1520-0469(1999)056<0437:WDIASS>2.0.CO;2