Use

Determine the noise level outdoors at a distance from a line source

User Inputs

1. Distance from the line source.
2. Line Source Coherency: **Incoherent (different broadband noise sources “along” the line) or coherent (tonal and/or equivalent noise sources “along” which are in phase).

SoundSurfer Input

Sound Power Level (red node).

Note the sound power level is the total energy over the length of the line source rather than a dB per m.

Algorithm

Cylindrical spreading over reflective ground (hemicylindrical)

Coherent sources:

$L_p = L_w - 10logr-8$

Incoherent sources:

$L_p = L_w - 10logr-6$