Effects of atmospheric inversion and stratification in the simulation of gravity currents over steep terrain

M. S. Yudin

doi:10.1117/12.2249119

29 November 2016 Effects of atmospheric inversion and stratification in the simulation of gravity currents over steep terrain

M. S. Yudin

Author Affiliations +

Proceedings Volume 10035, 22nd International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics; 100356K (2016) https://doi.org/10.1117/12.2249119
Event: XXII International Symposium Atmospheric and Ocean Optics. Atmospheric Physics, 2016, Tomsk, Russian Federation

Abstract

In the present paper, a preliminary investigation is carried out with a 2D finite-element model based on triangular elements .The model is used to simulate the phenomenon of cold front propagation over an idealized trapezoidal obstacle .The results of calculations are compared with measurements taken in a wind tunnel at neutral thermal stratification. The front surface is explicitly described by a special equation. A time filter is used to suppress the non-physical oscillations. The influence of an inversion layer introduced above an obstacle in the atmosphere on the propagation of gravity currents such as a well formed cold atmospheric front is investigated as well .The study is performed at stable stratification in and beyond the inversion layer. It is shown that the introduction of the inversion later produces some specific effects that lead to a significant decrease in the front speed both for the currents over the obstacle and those over flat orography.

Citation Download Citation

M. S. Yudin "Effects of atmospheric inversion and stratification in the simulation of gravity currents over steep terrain ", Proc. SPIE 10035, 22nd International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 100356K (29 November 2016); https://doi.org/10.1117/12.2249119

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