treasure valley road dust study: final report - ResearchGate

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Frequency of occurrence (days/year) 1000 100 10 1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 15 Consecutive days of precipitation Figure B-2. Histogram of the number of consecutive precipitation days. Table B-3. Summary of snowfall persistence (consecutive days). Consecutive days with snow Number of occurrences (1940-2001) Total Days Occurrences per year Days per year Cumulative days per year 8 1 8 0.02 0.13 0.13 7 1 7 0.02 0.11 0.24 6 4 24 0.06 0.39 0.63 5 12 60 0.19 0.97 1.60 4 22 88 0.36 1.42 3.02 3 61 183 0.99 2.96 5.98 2 196 392 3.17 6.33 12.31 1 497 497 8.03 8.03 20.34 0 21345 21345 344.89 344.89 365.23 On average, about 20 days per year have measurable snow. Fourteen of those are in episodes with durations of 1 or 2 days. The maximum number of consecutive days with snowfall is 8. Table B-4 shows a summary of monthly snowfall. December and January have the highest fraction of days with snow, about 20% each and the highest average monthly totals. For days with snowfall, the average amount is one inch. Table B-4. Summary of snowfall statistics by month, Boise airport January 1940-October 2001. Month Fraction of days with 0.01” or more snowfall Average daily precipitation when >0 Average monthly snowfall (inches) Jan 0.21 1.02 6.5 Feb 0.13 0.98 3.6 Mar 0.06 0.83 1.7 Apr 0.02 0.90 0.6 May 0.00 1.55 0.1 Jun 0.00 0.0 Jul 0.00 0.0 Aug 0.00 0.0 Sep 0.00 0.0 Oct 0.00 0.75 0.1 Nov 0.07 1.02 2.2 Dec 0.19 1.06 5.7 Annual 0.06 1.00 20.4 B-4
A.1 Wind speed The cumulative frequency distribution of wind speed is shown in Figure B-3. Winds in the 4-8 mph range were most common, occurring 56% of the time. Calms occurred about 8% of the hours. Sixteen percent exceeded 10 mph and 5% exceeded 14 mph. The maximum recorded wind speed for the period was 30 mph. Cumulative frequency (%) 100 90 80 70 60 50 40 30 20 10 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 Wind Speed (mph) Figure B-3. Cumulative frequency distribution of wind speed (mph). Average wind speed by month is shown in Figure B-4. Average wind speeds are highest in the spring (March-May) and lowest in December and January. Average wind speed by time of day (averaged over all months) is shown in Figure B-5. Wind speeds are low from about 9 pm through 8 am. They increase steadily from 8 am to 1 pm and then more slowly to 4 pm. From 5 to 9 pm winds subside steadily. At night, surface-based inversions cause light winds by decoupling the surface air from winds aloft. This results in stable atmospheric conditions overnight. As the mixing layer deepens during the day, higher momentum air is mixed down from aloft, increasing the surface wind speed. Most of the growth in the mixed layer depth and increase in wind speed occurs by early afternoon. Later in the afternoon, the mixed layer depth and surface wind speed increase more slowly. Wind speed decreases later in the day as the inversion sets in. Days are shorter in winter; therefore, compared to the average shown in Figure B-5 wind speeds decrease earlier in the evening and remain calm later into the morning. B-5
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TREASURE VALLEY ROAD DUST STUDY: FI
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EXECUTIVE SUMMARY The Idaho Departm
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TABLE OF CONTENTS 1. INTRODUCTION..
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6.3 DISCUSSION ....................
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are strongly correlated and that on
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Figure 4-17. Map of street sweeper
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xvi
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Table 5-3. Speeds and VKT by county
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Table A-28. Laboratory Silt Analysi
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?? To assess the impact of winterti
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2. SILT MEASUREMENTS For this study
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vehicle tires. The lengths of the s
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Figure 2-1. Map of Sample Collectio
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Table 2-5 Silt Content and Silt Loa
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collectors. In contrast, summer sil
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3.2 TRAKER Measurements For the TVR
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introduced by the carbon vanes insi
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3.2.4.1 Data Acquisition The TRAKER
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Figure 3-6 shows the TRAKER coeffic
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250 200 PM2.5 signal (mg/m 3 ) 150
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Line losses associated with the Dus
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1.2 1 Left Diluted Right Diluted Pr
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Table 3-2. Regression exponents for
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3.4.2 Flux Calculation from Meteoro
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12.2 m 0.16 9.0 m 0.05 5.7 m 0.22 4
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400 Ford Ranger on NS Road by DW1 4
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ceiling can be further stretched to
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100 sL = 2.5717(T*) 0.4741 R 2 = 0.
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4.1.1 Converting TRAKER Data Into E
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Table 4-1. (cont) GIS coverages use
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Table 4-1. (cont) GIS coverages use
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a. b. Figure 4-1. Map of TRAKER Str
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egressions, R 2 and P-values are al
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Summer - Ada - Rural Summer - Ada -
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The average emissions factor is 6.7
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Figure 4-5. TRAKER Loop 4.3.1 Tempo
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weeks prior to being swept. While t
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4.3.2 Meteorological Effects on Unp
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Section 1 Section 2 Section 3 Figur
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Figure 4-13. Johnston HSD mechanica
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Approximately 8 hours after the ini
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One-second emissions potentials (i.
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5. EMISSIONS INVENTORIES FOR THE TR
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where E i.10 is the emissions in gr
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County Setting Road Class Speed (m/
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January, February, and March were u
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5.1.3.2a January 1 - 9, 2000, 2010,
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Table 5-9 Precipitation and snow co
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complete link-level emissions inven
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Table 5-14. Distributions of averag
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Taken on an average annual basis, T
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Z n , K zn , ? c/ ? z n Z 3 , K z3
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Table 6-1. Aerodynamic particle siz
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14 m 0 s 15 s 30 s 60 s 120 s 240 s
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Furthermore, the vertical profile o
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?? Sieving each sample to obtain a
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7-4 Table 7-1. Source Profile Key M
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Table 6-1 (continued). Table of geo
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Treasure Valley Road Dust Winter Pa
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7.3 Source Profile Summary This a p
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Table 7-4. Source profiles of Summe
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Table 7-6. Source profiles of Winte
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Bliss experiments were significant
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section was swept with a vacuum swe
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8.3 Differences Between Emissions M
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determine at this time what fractio
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Page 146 and 147: Figure A-1. Map of Sample Collectio
Page 148 and 149: Table A-2. Summer 2001 Silt Samplin
Page 150 and 151: Table A-3. Laboratory Silt Analysis
Page 152 and 153: Figure A-3. Map of Silt Loading Loc
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Page 189 and 190: APPENDIX B. BOISE PRECIPITATION AND
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Page 195 and 196: APPENDIX C : EMISSIONS INVENTORIES:
Page 197 and 198: C.1.1.2a Field List for worksheets
Page 199 and 200: values specified by AP-42 and do no
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