United States Department of Transportation
i
Human response to aviation noise : development of dose-response relationships for backcountry visitors - volume II : results and analysis
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2014-03-01
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[PDF-2.66 MB]
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Edition:Final report, March 2014
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Abstract:The Federal Aviation Administration and National Park Service conducted joint research to better understand the effects of noise due to commercial air tour operations over units of the National Park System. To evaluate the relationship between aircraft noise exposure and the quality of National Park visitor experience, research was conducted at backcountry sites providing day- and overnight-hiking and camping opportunities. Over 4600 visitor surveys and fifty days of acoustical measurements were collected and analyzed to develop dose-response relationships for backcountry visitors. This report, the second of two volumes, describes the the model-fitting approach used to identify the noise exposure metrics and mediator variables that best predict visitor responses to aircraft noise. The dose variables identified include sound exposure level, percent time audible, and energy percentages due to helicopters and fixed-wing propeller aircraft. Mediator variables identified include visitor ratings of the ‘importance of calmness, peace and tranquility’, attributes of adults-only in group, first visit to the site, having taken an air tour, and participation in activities of watching birds and listening to an interpretive talk. The models developed can be used as a tool for evaluating potential effects of air tours on visitors to National Parks.
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