ATMOSPHERIC BOUNDARY LAYER STABILITY ESTIMATOR FOR URBAN AREA

Award Information
Agency: Department of Defense
Branch: Army
Contract: N/A
Agency Tracking Number: 15973
Amount: $49,967.00
Phase: Phase I
Program: SBIR
Awards Year: 1991
Solitcitation Year: N/A
Solitcitation Topic Code: N/A
Solitcitation Number: N/A
Small Business Information
Sigma Research Corp
234 Littleton Rd - Ste 2e, Westford, MA, 01886
Duns: N/A
Hubzone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Steven R Hanna
 Principal Investigator
 (508) 692-0330
Business Contact
Phone: () -
Research Institution
N/A
Abstract
IN MOST U.S. ARMY ATMOSPHERIC DISPERSION MODELS, THE PASQUILL METHODOLOGY IS USED TO ESTIMATE STABILITY IN THE BOUNDARY LAYER. AS A RESULT, THERE ARE DISCONTINUITIES IN CALCULATED DISPERSION AMONG THE SIX STABILITY CLASSES. FURTHERMORE, CORRECTIONS FOR SURFACE CONDITIONS (I.E., FIELDS, URBAN AREAS, OR FORESTS) ARE ALSO DISCRETE FUNCTIONS. RECENT THEORETICAL DEVELOPMENTS PROVIDE THE BASIS FOR REVISING THIS METHODOLOGY USING PRINCIPLES OF MONIN-OBUKHOV AND CONVECTIVE SIMILARITY THEORY. AN ALGORITHM FOR DETERMINING STABILITY AS A CONTINUOUS FUNCTION IS DEVELOPED FOR USE ON A PERSONAL COMPUTER. THIS ALGORITHM REQUIRES INPUT OF BASIC OBSERVATIONS SUCH AS WIND SPEED, CLOUDINESS, SURFACE ROUGHNESS AND ALBEDO, AND MOISTURE CONTENT OF THE GROUND. THE METHODOLOGY IS SUFFICIENTLY GENERAL THAT IT IS VALID FOR ALL TYPES OF UNDERLYING SURFACES AND PRODUCES AN ESTIMATE OF STABILITY THAT IS CONTINUOUS IN TIME AND SPACE. PROFILES OF WIND, TEMPERATURE, AND TURBULENCE CAN ALSO BE READILY CALCULATED BY THIS ALGORITHM, FOR DIRECT USE IN DISPERSION MODELS.

* information listed above is at the time of submission.

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