Abstract
The three-dimensional compressible non-hydrostatic mesoscale model ADREA, developed at NCSR “Demokritos” for wind field and dispersion predictions in complex terrain, is used to perform two-dimensional simulations of orographically induced precipitation. The model makes use of a simple cartesian grid by allowing blocked areas in the grid volumes and grid faces which are crossed by the irregular topography (the so-called porous-medium concept). Additionally, since we are seeking both simplicity and low computational requirements, only one prognostic equation for the whole of the water substance is implemented. The model equations are based on the theory developed for multicom-ponent/multiphase mixtures and give full account of the effects arising from the relative motion between water particles and moist air. The evaluation of the feasibility of this approach is obtained by comparing model predictions with measurements and analytical results concerning orographic precipitation episodes in the mountain barrier of Sierra Nevada.
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Housiadas, C., Amanatidis, G.T. & Bartzis, J.G. Prediction of orographic precipitation using cartesian coordinates and a single prognostic equation for the water substance. Boundary-Layer Meteorol 56, 245–260 (1991). https://doi.org/10.1007/BF00120422
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DOI: https://doi.org/10.1007/BF00120422