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OCR for page 112
112 Aircraft Noise: A Toolkit for Managing Community Expectations
Figure 7-1. Prediction curve from Fidell compared
with original Schultz Curve (adapted from Fidell,
Barber, 1991, as presented in ACRP Synthesis
S02-01 Report, Effects of Aircraft Noise: Research
Update on Selected Topics (145)).
Cumulative Noise Metrics
All cumulative noise metrics are expressions of the total amount of acoustic energy that is
present. Most express a 1-second average of the noise energy that occurs during a selected period
of time. Based on the needs of the governmental jurisdiction where each is used, they often are
adjusted to weigh more heavily periods of the day that are considered to be more noise-sensitive.
Those that the airport manager in the United States should become most familiar are the DNL
Table 7-1. Utility of available noise metrics for public communication programs.
Applicable Noise Metric Type in United States
Application Cummulative Single Event Hybrid
EIS/EA/Part 150 evaluations DNL, CNEL
Comprehensive land use planning DNL, CNEL Lmax, SEL, Altitude
Noise abatement planning DNL, CNEL Lmax, SEL, Slant NA, TA
range distance, altitude
Sound insulation DNL, CNEL, Leg Lmax
Section 303(c) or 4(f) evaluations DNL, CNEL
National Parks evaluations DNL TA ambient, TAUD
Vibration assessments C-weighted SEL
Sleep disturbance SEL
Speech disturbance Lmax
Public involvement and clarification DNL, CNEL Lmax, SEL, Slant NA, TA
programs range distance, altitude
DNL Day-Night Average Sound Level
CNEL Community Noise Equivalent Level
Leq Equivalent Sound Level
Lmax Maximum Noise Level
SEL Sound Exposure Level
NA Number of Events Above (a user defined threshold)
TA Time Above (a user defined threshold)
TAUD Time Audible
