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A Land Use Tool for AERMOD Urban/Rural Classification John Glass South Carolina – BAQ.

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Presentation on theme: "A Land Use Tool for AERMOD Urban/Rural Classification John Glass South Carolina – BAQ."— Presentation transcript:

1 A Land Use Tool for AERMOD Urban/Rural Classification John Glass South Carolina – BAQ

2 EPA 40 CFR Part 51, Appendix W Rural-Urban Classification ► ► Section 7.2.3: ► ► c. Land Use Procedure:   (1) Classify the land use within the total area, Ao, circumscribed by a 3km radius circle about the source using the meteorological land use typing scheme proposed by Auer 73;   (2) if land use types I1, I2, C1, R2, and R3 account for 50 percent or more of Ao, use urban dispersion coefficients; otherwise, use appropriate rural dispersion coefficients. ► ► d. Population Density Procedure:   (1) Compute the average population density, p per square kilometer with Ao as defined above;   (2) If p is greater than 750 people/km2, use urban dispersion coefficients; otherwise use appropriate rural dispersion coefficients. ► ► e. Of the two methods, the land use procedure is considered more definitive.

3 SC-BAQ before 2008 ► AQ modeling guidelines (2001): ”With few exceptions, all of SC is considered to be rural. Typically, the areas in the large metropolitan areas of the state (Greenville/Spartanburg, Columbia, and Charleston) will meet one of the … definitions of urban.” ”With few exceptions, all of SC is considered to be rural. Typically, the areas in the large metropolitan areas of the state (Greenville/Spartanburg, Columbia, and Charleston) will meet one of the … definitions of urban.” ►Limited population-based checking by SC-BAQ for facilities claiming “Urban” near metro “cores”

4 SC-BAQ starting in 2008 ► Objective “Urban-Rural” Tool  Based on preferred LAND USE method  Uses GIS/ArcView  “Bridge” from Auer’s scheme to NLCD 2001

5 Auer vs. NLCD 2001 Auer – “Urban” NLCD 2001 TypeUseVegetationPerviousUseNo. I1 Heavy Industrial <5 % 0-20 % Dvlpd, hi intensity 24 I2 Light Industrial <5 % 20-50 % Dvlpd, med intensity 23 C1Comm. <15 % 50-80 % Dvlpd, low intensity 22 R2 Compact Residential <30 % R3 Compact Residential <35 %

6 User’s Basic Steps 1. Open “Land Use” tool in ArcView 1. Open “Land Use” tool in ArcView 2. Enter Lat/Lon of facility 2. Enter Lat/Lon of facility 3. Create buffer (circle) at r=3 km 3. Create buffer (circle) at r=3 km 4. Activate % land use algorithm 4. Activate % land use algorithm 5. Sum % for NLCD categories 23 & 24 5. Sum % for NLCD categories 23 & 24 (≥50%=URBAN, <50%=RURAL) (≥50%=URBAN, <50%=RURAL)

7 Example: Downtown Columbia

8 Results - % Land Use Algorithm

9 Compare 2 downtown locn’s Before20082008+North(yellow)Urban?Rural(46%) South(black)Urban?Urban(50%)

10 ► COMMENTS ?? ► QUESTIONS ?? John Glass, 803-898-4074, glassjp@dhec.sc.gov


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