GEOGRAPHY & CARTOGRAPHY CALCULATOR
Canyonsnoise Level Distance
A precise tool.
What is the Canyonsnoise Level Distance & How does it work?
Sound spreads outward from a point source, and its intensity decreases with distance. In open terrain the decrease follows the inverse‑square law, which translates to a 6 dB loss each time the distance doubles.
In deep canyons the geometry of the walls can trap sound, effectively altering the spreading exponent. The exponent n in the propagation formula can range from 1 (cylindrical spreading) to 2 (spherical spreading) depending on how confined the acoustic energy is.
By combining the reference level with the appropriate spreading exponent, we can predict the noise level at any distance inside a canyon.
L = L_0 – 10 n \log_{10}\left(\frac{d}{d_0}\right)
L = noise level at distance d (dB)
L_0 = reference noise level at distance d_0 (dB)
n = spreading exponent
d = target distance (m)
d_0 = reference distance (m)
L_0 = reference noise level at distance d_0 (dB)
n = spreading exponent
d = target distance (m)
d_0 = reference distance (m)
Parameters
Result
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Frequently Asked Questions
How does sound intensity change with distance in open terrain?
In open terrain, sound intensity decreases by 6 dB each time the distance doubles.
What is the inverse-square law in acoustics?
The inverse-square law states that sound intensity decreases proportionally to the square of the distance from the source.
How does canyon geometry affect sound propagation?
Canyon walls can trap sound, altering its spreading pattern and reducing the rate of intensity decrease with distance.
What is the range for the acoustic spreading exponent n in canyons?
The exponent n ranges from 1 (cylindrical spreading) to 2 (spherical spreading), depending on how confined the sound is.
How does noise level change with distance in a canyon?
Noise level decreases more slowly than in open terrain due to acoustic confinement, often following an exponent n less than 2.
What factors affect the accuracy of this calculator?
Factors include the geometry of the canyon, material properties of the walls, and atmospheric conditions.
Can this calculator be used for urban noise assessment?
While primarily designed for canyons, it may provide rough estimates for other confined spaces with similar acoustic characteristics.
Results are for informational purposes only and do not constitute professional advice.