Laboratory simulations of the atmospheric mixed layer in flow over complex terrain

Metadata Updated: January 18, 2020

A laboratory study of the influence of complex terrain on the interface between a well-mixed boundary layer and an elevated stratified layer was conducted in the towing-tank facility of the U.S. Environmental Protection Agency. The height of the mixed layer in the daytime boundary layer can have a strong influence on the concentration of pollutants within this layer. Deflections of streamlines at the height of the interface are primarily a function of hill Froude number (Fr), the ratio of mixed-layer height (zi) to terrain height (h), and the crosswind dimension of the terrain. The magnitude of the deflections increases as Fr increases and zi / h decreases. For mixing-height streamlines that are initially below the terrain top, the response is linear with Fr; for those initially above the terrain feature the response to Fr is more complex. Once Fr exceeds about 2, the terrain-related response of the mixed layer interface decreases somewhat with increasing Fr (toward more neutral flow). Deflections are also shown to increase as the crosswind dimensions of the terrain increases. Comparisons with numerical modeling, limited field data and other laboratory measurements reported in the literature are favorable. Additionally, visual observations of dye streamers suggests that the flow structure exhibited for our elevated inversions passing over three dimensional hills is similar to that reported in the literature for continuously stratified flow over two-dimensional hills.

This dataset is associated with the following publication: Perry, S., and W. Snyder. Laboratory simulations of the atmospheric mixed-layer in flow over complex topography. PHYSICS OF FLUIDS. Physics of Fluids, 29(2): 020702, (2017).

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Metadata Created Date April 25, 2017
Metadata Updated Date January 18, 2020

Metadata Source

Harvested from EPA ScienceHub

Additional Metadata

Resource Type Dataset
Metadata Created Date April 25, 2017
Metadata Updated Date January 18, 2020
Publisher U.S. EPA Office of Research and Development (ORD)
Unique Identifier A-w6n0-522
Steven Perry
Maintainer Email
Public Access Level public
Bureau Code 020:00
Schema Version
Data Dictionary
Data Dictionary Type application/vnd.openxmlformats-officedocument.wordprocessingml.document
Harvest Object Id 37d889c6-5063-4e07-a4c3-e98cf8a12ee4
Harvest Source Id cf9b0004-f9fd-420e-bade-a86839e82acf
Harvest Source Title EPA ScienceHub
Data Last Modified 2016-10-03
Program Code 020:094
Publisher Hierarchy U.S. Government > U.S. Environmental Protection Agency > U.S. EPA Office of Research and Development (ORD)
Related Documents
Source Datajson Identifier True
Source Hash d43b3e75bd2149051a9bf5adcb6eb6ec9ba018e1
Source Schema Version 1.1

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