Numerical reference models are necessary to validate engineering methods used for acoustical predictions in realistic situations. These situations include irregular geometries and characteristics that are not accurately known. This can be due to the complexity of the propagation medium, space and time variability of its physical properties, measurements uncertainties, etc. The objective of this work is to compute sound propagation through such a complex medium using a TLM numerical method. First examples of numerical studies dealing with irregular ground geometry and impedance properties are presented.
