Technical Report 2013-018

Atmospheric Sound Propagation over Large-Scale Irregular Terrain

Martin Almquist, Ilkka Karasalo, and Ken Mattsson

September 2013

A benchmark problem on atmospheric sound propagation over irregular terrain has been solved using a stable fourth-order accurate finite difference approximation of a high-fidelity acoustic model. A comparison with the parabolic equation method and ray tracing methods is made. The results show that ray tracing methods can potentially be unreliable in the presence of irregular terrain.

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