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On the Conditions of the Emergence of a Periodic Mode of Saltating Flow

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Abstract

The effect of the emergence of quasi-periodic oscillations of particle (with size >50 mсm) concentrations in the saltation flow has been detected in similar arid conditions in desertified areas: (1) using high-speed video in Astrakhan region (2009); (2) by acoustic method in the Republic of Kalmykia (2021). During the field experiments were revealed characteristic low frequencies (<50 Hz), which is associated with the peculiarities of the microrelief shape. More high frequences (>50 Hz) have been observed also. The appearance of these frequencies is determined by changes in the saltation cycle in heterogeneous topography. Such processes is simulated in a numerical experiment using the OpenFoam package. There are demonstrated the characteristic frequencies of changes in the number of particles (from 10 to 200 Hz) in the saltation flow over the surface ledge of the ripple type. Numerical experiments include analysis of frequency characteristics of particle concentration changes in the flow behind the ledge. Spectral analysis of data of numerical realizations of the saltation flow at variation of boundary parameters and height of the obstacle shows that the characteristic frequency or frequencies change and are close to those observed in the experiment. Input parameters such a models can be adjusted with such analysis.

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ACKNOWLEDGMENTS

The authors are grateful to O.G. Chkhetiani for his constant attention to the topic of the present research, his help in organizing and conducting expeditionary measurements, and his constructive comments.

Funding

The research was supported by the Russian Science Foundation—Project no. 23-27-00480 “Study of generation and export of dust aerosol over arid territories under conditions of terrain and temperature inhomogeneities”.

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Authors and Affiliations

  1. Obukhov Institute of Atmospheric Physics RAS, 119017, Moscow, Russia

    E. A. Malinovskaya, G. I. Gorchakov, A. V. Karpov, L. O. Maksimenkov & O. I. Datsenko

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  1. E. A. Malinovskaya
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  2. G. I. Gorchakov
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  3. A. V. Karpov
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  4. L. O. Maksimenkov
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  5. O. I. Datsenko
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Correspondence to E. A. Malinovskaya.

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Malinovskaya, E.A., Gorchakov, G.I., Karpov, A.V. et al. On the Conditions of the Emergence of a Periodic Mode of Saltating Flow. Izv. Atmos. Ocean. Phys. 59, 749–759 (2023). https://doi.org/10.1134/S0001433823330022

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  • DOI: https://doi.org/10.1134/S0001433823330022

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