The modification and application of RAMS computer code. Final report Page: 1 of 13
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Subcontract 9XA3-6764H-1 CSU-LANL
THE MODIFICATION AND APPLICATION
OF RAMS COMPUTER CODE
Thomas B. McKee, Principal Investigator
January 17, 1995
Department of Atmospheric Science
Colorado State University
Fort Collins, Colorado, 80523
The Regional Atmospheric Modeling System (RAMS) has been utilized in its
most updated form, version 3a, to simulate a case night from the Atmospheric
Studies in COmplex Terrain (ASCOT) experimental program. ASCOT held a
wintertime observational campaign during February, 1991 to observe the often
strong drainage flows which form on the Great Plains and in the canyons embed-
ded within the slope from the Continental Divide to the Great Plains. A high reso-
lution (500 m grid spacing) simulation of the 4-5 Feb 1991 case night using the
more advanced turbulence closure now available in RAMS 3a allowed greater
analysis of the physical processes governing the drainage flows. It is found that
shear interaction above and within the drainage flow are important, and are over-
predicted with the new scheme at small grid spacing (<-1000 m). The implica-
tion is that contaminants trapped in nighttime stable flows such as these, will be
mixed too strongly in the vertical reducing predicted ground concentrations. The
HYPACT code has been added to the capability at LANL, although due to the
reduced scope of work, no simulations with HYPACT were performed.
C TRIBUTION F THIS DOCUMENT is UNL MIT M A S T
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McKee, T.B. The modification and application of RAMS computer code. Final report, report, January 17, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc780230/m1/1/: accessed March 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.