NextGen for Noise Mitigation Paul Dunholter, P.E. BridgeNet International October 10, 2007.

NextGenfor Noise MitigationPaul Dunholter, P.E.

BridgeNet International

October 10, 2007

AAAE Noise Mitigation Symposium – San Diego October 10, 2007 2

Presentation Outline

What we do TodayWhat we do Today How will NextGen for ATC Alter How will NextGen for ATC Alter

NoiseNoise Options for NextGen in Noise Options for NextGen in Noise

MitigationMitigation SummarySummary

AAAE Noise Mitigation Symposium – San Diego October 10, 2007 3

Evolution of DNL Contours

““First generation” DNL Noise ContoursFirst generation” DNL Noise Contours Contours generated in late 1970’s – early 1980’sContours generated in late 1970’s – early 1980’s Fewer operations than today; contour influenced by Fewer operations than today; contour influenced by

loud Stage 2 aircraftloud Stage 2 aircraft ““Second generation” DNL Noise ContoursSecond generation” DNL Noise Contours

Contours generated 1990’s – presentContours generated 1990’s – present Increase in operations; contour influenced by Increase in operations; contour influenced by

number of operations and small amount of Stage 2 number of operations and small amount of Stage 2 activityactivity

Source noise greatly reduced = smaller contour = Source noise greatly reduced = smaller contour = fewer homes eligiblefewer homes eligible

Where do we go from here?Where do we go from here?

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Evolution of Mitigation

Prior to 1990 Airports has Ability to Prior to 1990 Airports has Ability to Propose Airport Specific MitigationPropose Airport Specific Mitigation

Post 1990 ANCA Limited Local Post 1990 ANCA Limited Local ActionsActions SuccessesSuccesses

• Substantial Home Insulation Completed to 65 DNLSubstantial Home Insulation Completed to 65 DNL• Removal of the Loudest Aircraft from FleetRemoval of the Loudest Aircraft from Fleet• Reduction in overall DNLReduction in overall DNL

LimitationsLimitations• Airport Development did not Match DemandAirport Development did not Match Demand• Community Opposition Still limits GrowthCommunity Opposition Still limits Growth

AAAE Noise Mitigation Symposium – San Diego October 10, 2007 5

NextGen and Noise

Noise is Noise is NOTNOT Going Away Going Away Substantial Growth in OperationsSubstantial Growth in Operations

Aircraft with Quieter but Similar Noise Aircraft with Quieter but Similar Noise CharacteristicsCharacteristics

Reduced Separation StandardsReduced Separation Standards Less time between flights Less time between flights

More Precisely Flown PathsMore Precisely Flown Paths Concentrated NoiseConcentrated Noise

AAAE Noise Mitigation Symposium – San Diego October 10, 2007 6

ADS-B Implementation

AAAE Noise Mitigation Symposium – San Diego October 10, 2007 7

Louisville ADS-B Example

AAAE Noise Mitigation Symposium – San Diego October 10, 2007 8

Noise NextGen Options

Do Nothing – keep using 65 DNLDo Nothing – keep using 65 DNL Use DNL at a lower valueUse DNL at a lower value Use Supplemental metricUse Supplemental metric Tie Mitigation to Capacity Tie Mitigation to Capacity

GrowthGrowth

AAAE Noise Mitigation Symposium – San Diego October 10, 2007 9

Noise Metric Argument

Approved MetricsApproved Metrics DNLDNL CNELCNEL

Alternative MetricsAlternative Metrics Number AboveNumber Above Single Event Noise LevelSingle Event Noise Level Time AboveTime Above School HoursSchool Hours Low frequencyLow frequency

AAAE Noise Mitigation Symposium – San Diego October 10, 2007 10

DNL Gets No Respect

Why is DNL the wrong metric?Why is DNL the wrong metric? Does not measure what you hearDoes not measure what you hear

• AKA – Single Event Noise LevelAKA – Single Event Noise Level Impossible to ExplainImpossible to Explain Averages NoiseAverages Noise More Sensitive to high noise events then More Sensitive to high noise events then

number of eventsnumber of events Single Number rating scale can never Single Number rating scale can never

account for all situationsaccount for all situations

AAAE Noise Mitigation Symposium – San Diego October 10, 2007 11

DNL gets no respect

Why is DNL the right metric?Why is DNL the right metric? Is it worth it to change it???? Is it worth it to change it???? Anything better????Anything better???? Is arguing over noise metrics the right Is arguing over noise metrics the right

battle to fight????battle to fight???? Flexibility to use lower metric (e.g., 60 Flexibility to use lower metric (e.g., 60

DNL)DNL)

AAAE Noise Mitigation Symposium – San Diego October 10, 2007 12

Can Supplemental Metrics Solve the Issue?

Are supplemental metrics the Are supplemental metrics the answer?answer? Number of Events AboveNumber of Events Above Time AboveTime Above Single eventSingle event Heath EffectsHeath Effects School HoursSchool Hours Low FrequencyLow Frequency

Is it the metric or the noise Is it the metric or the noise threshold?threshold?

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Tie Mitigation to Capacity Growth

Allow for Local ControlAllow for Local Control Create Financing Options for Create Financing Options for

MitigationMitigation Funding for mitigation beyond Funding for mitigation beyond

65 DNL when Capacity 65 DNL when Capacity Enhancement occursEnhancement occurs

Stick to DNL Stick to DNL

AAAE Noise Mitigation Symposium – San Diego October 10, 2007 14

Contact:Contact:

Paul DunholterPaul Dunholter

BridgeNet InternationalBridgeNet International

[email protected]@airportnetwork.com

714-540-3120 extension 24714-540-3120 extension 24