Numerical simulation of gravity flows in the atmosphere over rough terrain

M. S. Yudin

doi:10.1117/12.2074884

25 November 2014 Numerical simulation of gravity flows in the atmosphere over rough terrain

M. S. Yudin

Proceedings Volume 9292, 20th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics; 92924T (2014) https://doi.org/10.1117/12.2074884
Event: 20th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 2014, Novosibirsk, Russian Federation

Abstract

In this paper the propagation of a cold atmospheric front over orographic obstacles of various shapes is simulated with a 2D small-scale meteorological finite-element model. Flow over a low hill at a coastal site with rough terrain at neutral thermal stratification is simulated with non-hydrostatic and hydrostatic models. The front surface is explicitly described by a special equation. A time filter is used to suppress the non-physical oscillations. The effects of flow retardation and near surface blocking under steep orography are estimated. The upwind and downwind velocities calculated for typical values of the parameters of orography and stratification are presented. It is shown that in case of coastal flow with a significant water- land surface roughness change, the nonhydrostatic model results are in better agreement with the measurement data than the hydrostatic model ones.

Citation Download Citation

M. S. Yudin "Numerical simulation of gravity flows in the atmosphere over rough terrain", Proc. SPIE 9292, 20th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 92924T (25 November 2014); https://doi.org/10.1117/12.2074884

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