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Outdoor sound propagation over ground of finite impedance
Abstract
There is an extensive body of theory, and some laboratory measurements, of sound propagation over a surface of finite impedance. There are also reliable measurements of outdoor sound propagation in near-horizontal directions over the ground. In an attempt to relate these more closely, we have made carefully controlled measurements at ranges from 1 to 1000 ft, in most cases over grass-covered flat surfaces, to demonstrate the several phenomena that are involved. These phenomena depend on, and conversely provide a means of estimating, the values of ground impedance for waves at near-grazing angles of incidence. Such values obtained for grass-covered surfaces are in reasonable agreement with each other and with values obtained by conventional means at other angles of incidence. It is suggested that simple but accurate predictions of noise levels can be made by assuming that an excess attenuation due to finite ground impedance would always exist in a certain shadow region near the ground. This shadow region is however penetrated at low frequencies by a ground wave, to an extent that depends principally on distance and ground impedance, and at higher frequencies by interference between direct and ground-reflected waves to an extent that depends also on source and receiver heights. These phenomena, well established at ranges up to about 1000 ft and in some aspects to over 3000 ft, have been extrapolated theoretically to the order of 10 000 ft so that simple effects of topography and meteorology can be added to show how reflection or refraction acts in conjunction with ground impedance to result in penetration of the shadow region. Subject Classification: [43]28.40; [43]20.55.
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Metadata
- Authors
- Embleton, T. F. W., Piercy, J. E., & Olson, N.
- Affiliations
- National Research Council Canada (CA)
- Venue
- The Journal of the Acoustical Society of America
- Publisher
- Acoustical Society of America (ASA)
- Published
- 1976-02-01
- Volume
- 59
- Issue
- 2
- Pages
- 267-277
- ISSN
- 0001-4966 (ISSN-L)
- 1520-8524
- OpenAlex
- W2051368652
- Cited by
- 153
- References
- 0
- Citations by year
- 2025: 1 · 2024: 3 · 2023: 1 · 2022: 4 · 2021: 1 · 2020: 3 · 2019: 2 · 2018: 4 · 2017: 1 · 2016: 4 · 2015: 2 · 2014: 3 · 2013: 2 · 2012: 4
- FWCI
- 9.86
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Journal of the Acoustical Society of America (publishedVersion)
- Topics
- Physical Sciences › Physics and Astronomy › Acoustics and Ultrasonics › Acoustic Wave Phenomena Research
- Physical Sciences › Physics and Astronomy › Acoustics and Ultrasonics › Noise Effects and Management
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Underwater Acoustics Research
- Keywords
- outdoor sound propagation, ground impedance, grazing incidence, shadow zone, ground wave, interference, noise prediction, topographic effects, weather effects
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