Results from unmanned measurements will be compared to previous manned studies and methods for quantifying the natural soundscape and the effect of intrusions will be discussed. Challenges of modeling aircraft noise in national parks . Aircraft noise in national parks has become a matter of concern in recent years. Modeling that noise for purposes of impact assessment and decision making poses challenges that are generally not present for conventional airport noise analysis. People present in parks are not residents, so conventional annual DNL analysis cannot be assumed to be appropriate.
Parks can also have a variety of ground cover and terrain, with terrain quite extreme in places.
Despite the differences, and obvious extended capabilities required, any noise model must have a solid relation to existing standard practices. This paper reviews the issues which must be addressed in a model which is suitable for modeling of noise in national parks. Using visitor responses to rank order national park soundscapes . Using the relationships between these two visitor responses and these two measures of aircraft sound, a framework is developed that permits a rank-ordering of park locations in terms of visitor reaction, once these two metrics have been measured at the location. Respondents' interpretations of impact measures for dose-response studies .