Generic Guidance and Optimum Model Settings for the CALPUFF ...

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long. Some of the buoyant emissions from the reduction process escape through a continuous ridge ventilator, which is a few meters wide, running the length of the potroom. Most of the emissions, however, are collected by hooding above the reduction cells and are treated and exhausted through nearby stacks. There are typically 2 to 20 point sources, usually low-level, for each potroom primary control system. Since a buoyant line source has one less degree of freedom than an isolated point source in entraining air, the plume rise will be enhanced. In addition, the line source rise will be dependent on wind direction, line length, the number of parallel lines, and their spacing. Both the line source and the short point sources are subject to building downwash effects. 3.5.1 Entering Line sources into CALPUFF The coordinates of the beginning and ending locations of each line are used to determine the points of release, and the orientation of the lines. In addition, for a group of such buildings, the average source attributes are needed: L the average building (line) length (m) Hb the average building height (m), Wm the average line source width (m) Dx the average spacing between buildings (m) and F| the average line source buoyancy parameter (m 4 /s 3 ) Where F| = g L WM w ( T s – Ta ) _________________ Ts And, g is the gravitational acceleration (m/s 2 ) w is the exit velocity (m/s) Ts is the exit temperature (K), and Ta is the ambient air temperature (K) The buoyancy parameter is computed for each line and then averaged. 24
Figure 3-3. Shows a cross-section of two adjacent buildings with dimensions defined (Schulman and Scire, 1980). The GUI screen shot below from CALPRO shows the Line Source Input section. Figure 3-4. CALPRO GUI screenshot showing the CALPUFF user input control screen for entering line source data. 25
Page 1 and 2: Generic Guidance and Optimum Model
Page 3 and 4: Contents SCOPE OF WORK AND BACKGROU
Page 5 and 6: LIST OF FIGURES Page Figure 2-1. Fi
Page 7 and 8: SCOPE OF WORK AND BACKGROUND A.1 In
Page 9 and 10: 1. INTRODUCTION The CALPUFF modelin
Page 11 and 12: 2.3 Methodologies for Running CALME
Page 13 and 14: hourly profiles of wind speed, wind
Page 15 and 16: Table 2-2. Model Option Switches fo
Page 17 and 18: 2.3.4 Single Station Meteorology It
Page 19 and 20: Note that in no-observations (No-Ob
Page 21 and 22: Table 2-3. Tabulated List of Variou
Page 23 and 24: 3 RECOMMENDED MODEL OPTION SETTINGS
Page 25 and 26: Ridge 1 distance (km) Ridge 2 Figur
Page 27 and 28: Boundary Layer (TIBL) over the land
Page 29: � algorithms were designed to tre
Page 33 and 34: 3.5.2 Evaluation Studies Figure 3-6
Page 35 and 36: AERMOD BLP 60 70 80 90 95 98 99 Cum
Page 37 and 38: In CALPUFF, by default, a calm peri
Page 39 and 40: UTM Y Coordinate (km) - WGS84 6474.
Page 41 and 42: It is important to note that no eva
Page 43 and 44: 6474.5 6474 6473.5 6473 6472.5 6472
Page 45 and 46: sigma v (CALPUFF calculated) Figure
Page 47 and 48: 4. DISCUSSION ON THE APPROPRIATE PR
Page 49 and 50: 4.3.1 Graphical Evaluation Graphica
Page 51 and 52: (uncorrelated). A line of best fit,
Page 53 and 54: 4.3.3 Other Meteorological Evaluati
Page 55 and 56: Schulman, L.L. and J.S. Scire, 1980
Page 57 and 58: Table A-1. An Explanation of the 7
Page 59 and 60: Table A-1 An Explanation of the 7 C
Page 61 and 62: Table A-2 Explanation and Recommend
Page 67 and 68: Table A-4. Explanation and Recommen
Page 69: Table A-4 Explanation and Recommend

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