Download - NextGen for Noise Mitigation Paul Dunholter, P.E. BridgeNet International October 10, 2007
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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
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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
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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
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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
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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
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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
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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)
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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
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Contact:Contact:
Paul DunholterPaul Dunholter
BridgeNet InternationalBridgeNet International
[email protected]@airportnetwork.com
714-540-3120 extension 24714-540-3120 extension 24