Sound speed profiles linearisation for engineering methods

Fabrice Junker (1)

1 EDF - EDF

Due to the large distances and the numerous sources to be considered, environmental noise impact is calculated using engineering methods. These methods are based on path finding approaches. Many studies have shown that the influence of meteorological effects has to be taken into account to get realistic results. This can be achieved by curving the ray paths or by using the curved ground analogy considering a linear variation of the sound speed along the height. As the real sound speed profiles are well defined by a combination of linear and logarithmic functions of the height, a suitable linearisation approach has to be done. This is the scope of this paper. It is based on the comparison of two sets of results from Parabolic Equation calculations. A first set of calculations is done using realistic linear/logarithmic profiles. A second set is done using linear profiles. A comparison between the two sets shows that the linearisation approach must consider not only the geometric parameters (source and receiver heights, propagation distance) but also the absorption of the ground.

Mots clés: Engineering Methods; Outdoor Sound Propagation

Domaines: Acoustique [physics.class-ph]

Fabrice Junker. Sound speed profiles linearisation for engineering methods. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811051⟩