mn/dot – acec/mn annual consultant conference partnering – innovation – multimodal march 1,...
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The New Transformer Sequel: “Transportation Engineer Becomes Atmospheric Scientist” Richard H. Osa, QEP*. Mn/DOT – ACEC/MN Annual Consultant Conference Partnering – Innovation – Multimodal March 1, 2011 Earle Brown Heritage Center. - PowerPoint PPT PresentationTRANSCRIPT
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The New Transformer Sequel:“Transportation Engineer Becomes Atmospheric Scientist”
Richard H. Osa, QEP*
Mn/DOT – ACEC/MN Annual Consultant Conference
Partnering – Innovation – Multimodal
March 1, 2011
Earle Brown Heritage Center
*with technical assistance, courtesy of Tom Fidler, P.E., Bonestroo
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Transformers…
…Traditionally Tough On All Modes Of Transportation
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Transportation Engineer Transforms Into…
… Atmospheric Scientist!
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Transportation Engineer Becomes…
•Civil engineer•Financial analyst•Public relations specialist•Materials scientist•Supply chain traffic cop•Contracts administrator•Labor negotiator•Et cetera
…Just wasn’t enough
Because:
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Transportation—Part of the Problem…While transportation makes possible our complex and
comfortable lifestyle,
▫ Transportation demands almost 28% of the country’s energy—most of it provided by dwindling oil supplies
▫ Transportation generates massive quantities of air pollutants: potential for localized acute health impacts
o CO
o NOx
o PM2.5 (and its precursors)
o contributes to regional O3 formation
o over half of transportation emissions due to personal vehicles
greenhouse gas emissions add to global climate change
o transportation responsible for one-third of U.S. GHG emissions
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Transportation Planning, Design—Part of the Solution…
▫ Vehicle manufacturers doing their part aerodynamics
engine efficiency
after a long stagnant period, even personal vehicle fleet fuel economy projected to improve in coming years
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Transportation Planning, Design—Part of the Solution…
▫ Multi-modal options promise even greater freight transport savings
sophisticated logistical management systems select optimal mode(s) & minimize deadheading
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Transportation Planning, Design—Part of the Solution…
▫ Deliberate planning methods can reduce VMT, fuel demand, air emissions
▫ Advanced roadway designs can reduce congestion, fuel demand, and build-up of unhealthy air pollutant concentrations
▫ Advanced transportation management policies & technology can also reduce congestion with corresponding benefits
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Today’s Message: Changes Are Coming
▫ National Ambient Air Quality Standards (NAAQS)
•NO2
•PM2.5
•O3
•CO▫ Greenhouse Gas (GHG) Management
▫ “SIP Conformity” process: new challenges• MOVES emissions model• “Hot Spot” monitoring, assessment
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Today’s Message: Changes Are Coming—NAAQS
Atmospheric Chemistry
NO + O3 NO2
NOx, SO2 PM2.5 (NO3-, SO4
-2), “haze”
VOC, NOx O3, “haze”
(sunlight)
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Today’s Message: Changes Are Coming—NO2
▫NO2
This one is HOT! 1/10/2010 EPA adds new, 1-hr
standard (100 ppb) to existing 53 ppb annual NAAQS
May affect any combustion source with a low release height and limited “buffer” distance to ambient air
Additional monitoring required—near highways
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Today’s Message: Changes Are Coming—NO2
EPA is establishing new NO2 ambient air monitoring requirements:
• In urban areas, monitors required near major where maximum concentrations expected
• Additional monitors required in large urban areas to measure the highestconcentrations that occur more broadly across communities
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Today’s Message: Changes Are Coming—NO2
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Today’s Message: Changes Are Coming—NO2
Atmospheric Chemistry I: NOx
▫ NOx is combustion byproduct
atmospheric and fuel nitrogen and atmospheric oxygen under high temperature and pressure
in internal combustion engine exhaust, most NOx is in the form of nitric oxide, NO
▫ In the atmosphere, NO oxidizes to NO2
reaction rate is largely determined by atmospheric ozone (O3) concentration—the higher the O3 concentration, the faster NO converts to NO2
▫ NAAQS is specific to NO2; if NO has not converted to NO2 by the time it reaches a monitor (or receptor being modeled), it doesn’t “count”
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Today’s Message: Changes Are Coming—NO2
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Today’s Message: Changes Are Coming—NO2
▫ National Ambient Air Quality Standards (NAAQS)
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Today’s Message: Changes Are Coming—PM2.5
▫PM2.5 recipes:
Primary PM2.5 emissions SO2 + O2 = SO4
-2 (part.)
NOx + O2 = NO3- (part.)
▫EPA & states regulating both primary emissions, as well as the precursors NOx, SO2, making PM2.5 a triple threat
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Today’s Message: Changes Are Coming—PM2.5
▫Particulate Matter 9/21/2006 EPA promulgates PM2.5 standards
35 µg/m3, 24 hr avg, 15 µg/m3, annual avg retains PM10 NAAQS: 150 µg/m3, 24 hr avg
Managing “secondary” particles crucial to PM2.5
attainmento constrains SO2 and NOx emissions
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Today’s Message: Changes Are Coming—PM2.5
Already very close to natural background concentrations…especially in the western (drier) states
Next NAAQS review is going to be late—maybe proposal in summer 2011; promulgation in 2012?
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Today’s Message: Changes Are Coming--Ozone
▫ O3
Still struggling with “old, old” 1-hr standard in legacy non-attainment areas
Making progress on the “old, new” (1997) 8-hr standard (85 ppb)
“Phase 2” implementation rule for “old, new” 8-hr standard being contested; resolution expected ???
“New, new” (2008) 8-hr standard (75 ppb)
Ozone standard is coming frighteningly close to natural background concentrations
Managed by controlling VOC and/or NOx emissions
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Today’s Message: Changes Are Coming—CO & Lead
▫ CO
1/28/2011 EPA proposes no change to NAAQS (Hooray!!!)
Additional air monitoring proposed
▫ Pb
11/12/2008 EPA reduced standard from 1.5 µg/m3 to 0.15 µg/m3, 24-hour average
12/14/2010 additional air monitoring required
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Today’s Message: Changes Are Coming
▫ Just because a monitor shows NAAQS compliance does not mean you’re off the hook…
▫ Modeling may not be as “forgiving”; modeled violations may pose just as effective a barrier to a project as monitoring
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So…Let’s Look At Modeling and NO2 Compliance
Distance From Hwy Centerline (m)
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Transportation Design to Reduce Carbon Footprint
▫ Simulation compared traffic flow, projected fuel consumption, and greenhouse gas emissions (i.e., “carbon footprint”) of traditional signalized intersections with an alternative configuration using roundabouts
▫ Exercise used the VISSIM simulation software
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Base Case—Signalized Configuration
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Base Case—Signalized Configuration
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Alternative Case—Roundabout Pair
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Alternative Case—Roundabout Pair
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Transportation Design to Reduce Carbon Footprint
▫
Fuel Consumption
(gal)
Greenhouse Gas Emissions
(CO2 equivalent)
6-hr Annual6-hr (lb)
Annual(metric tonne)
Two Signalized Intersections 37 53,407 710 387
Two Roundabout Intersections 24 34,733 462 252
Greenhouse Gas Emission
Reduction 13 18,673 248 135
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Transportation Design to Reduce Carbon Footprint
▫
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Questions?
Discussion?
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Questions?
(if this doesn’t provoke discussion...)