The aim of this work is to study sound propagation in a U-shaped street canyon with reflecting building facades. A 3D parabolic equation is developed which takes into account meteorological conditions. We use the approximation of effective sound speed to consider temperature gradients and the convection effect of the wind. The source is initialized by a gaussian starter in the frequency domain and the propagation operator is simplified using a Pade approximation. The initial- and boundary-value problem is numerically solved using an alternating direction method. Numerical results show the modal behaviour of the sound field. Comparisons between experimental and numerical results are also presented.
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