treasure valley road dust study: final report - ResearchGate

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B.1 Precipitation Daily precipitation data is summarized for the Boise airport for the period Jan 1940- October 2001. Hourly wind speed data is summarized for the period January 1988-December 1994. Average annual precipitation for the period 1940-2000 is 11.88” with a standard deviation of 2.43 inches. Maximum annual precipitation was 18.77” in 1983; minimum was 6.64 “ in 1966. Table B-1 gives the fraction of days with precipitation 0.01” or more, the average daily precipitation, and the average precipitation for days with measurable precipitation. Table B-1. Summary of precipitation statistics by month, Boise airport January 1940-October 2001. Month Fraction of days with 0.25 mm or more precipitation Average daily precipitation (inches) Average daily precipitation when >0 Jan 0.38 1.17 0.12 Feb 0.36 1.04 0.11 Mar 0.31 1.02 0.13 Apr 0.28 1.02 0.15 May 0.25 1.04 0.16 Jun 0.20 0.74 0.15 Jul 0.08 0.23 0.11 Aug 0.08 0.23 0.12 Sep 0.12 0.51 0.16 Oct 0.19 0.66 0.14 Nov 0.34 1.14 0.13 Dec 0.37 1.12 0.12 Annual 0.25 0.81 0.13 Table B-1 shows that the frequency of precipitation peaks during winter, with November through February having measurable precipitation on more than one-third of the days. There is a gradual drop off in precipitation frequency in the spring. In July and August only 8% of the days have measurable values. Precipitation in September is also relativelyinfrequent; October is a transition month with frequency about mid-way between winter and summer. As precipitation amounts are typically somewhat higher for days in the spring compared to winter, average daily precipitation is relatively constant from November through May, even through the frequency of precipitation days decreases in spring. On a yearly average basis, 25% of the days have measurable amounts, with an average of 0.13” on those days. Figure 1 shows a cumulative frequency distribution of amounts for days with measurable precipitation (25% of all days). About 50% of the days with precipitation have less than 0.08”. Nearly 25% have only 0.01- 0.02”. 11% of the days with precipitation have >0.30”. B-2
Pecentile among days with precipitation 100 90 80 70 60 50 40 30 20 10 0 0.01 0.1 1 10 Daily precipitation (inches) Figure B-1. Cumulative frequency distribution of daily precipitation for days with measurable precipitation at Boise Airport January 1940-November 2001. Table B-2 and Figure B-2 summarize the persistence of days with precipitation. Of the 90 days per year with precipitation about 24 days each are in episodes with 1 or 2 consecutive days. On average about 15 days per year are in episodes with 3 consecutive days; 10 days are in episodes with 4 consecutive days. The maximum number of consecutive days on record is 16. However, the number of consecutive days with precipitation exceeded 8 days only 12 times in 61 years. Table B-2. Summary of precipitation persistence (consecutive days). Consecutive days with precipitation Number of occurrences (1940-2001) Total Days Occurrences per year Days per year Cumulative days per year 16 1 16 0.02 0.26 0.26 15 1 15 0.02 0.24 0.50 13 1 13 0.02 0.21 0.71 12 2 24 0.03 0.39 1.10 11 2 22 0.03 0.36 1.45 10 1 10 0.02 0.16 1.62 9 4 36 0.06 0.58 2.20 8 12 96 0.19 1.55 3.75 7 22 154 0.36 2.49 6.24 6 34 204 0.55 3.30 9.53 5 85 425 1.37 6.87 16.40 4 163 652 2.63 10.53 26.93 3 310 930 5.01 15.03 41.96 2 742 1484 11.99 23.98 65.94 1 1474 1474 23.82 23.82 89.76 0 17049 17049 275.47 275.47 365.23 Table B-3 shows information equivalent to Table B-2, except for snowfall days rather than precipitation (rain or snow). For days with snowfall, the snowfall is on average equivalent to approximately 11 times the recorded liquid water equivalent. This equivalence is probably understated since some of the days with recorded snowfall would have had a combination of both rain and snow. B-3
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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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Page 146 and 147: Figure A-1. Map of Sample Collectio
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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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