Description of snow transport and accumulation in  mathematical model of surface mass balance of  mountain glacier. Part II. Parameterization of avalanche feeding

О.О. Rybak1,2, Е.А. Rybak1,2, I.A. Korneva2,3

 1Sochi Research Center of RAS, Sochi

2Branch of Institute of Natural and Technical Systems, Sochi

E-mail: o.o.rybak@gmail.com, elena.rybak@gmail.com

3Yu.A. Israel Institute of Global Climate and Ecology, Moscow

Email: comissa@mail.ru

DOI: 10.33075/2220-5861-2019-4-72-80

UDC 551.321.86

Abstract:

     Snow avalanches are able to contribute essentially to the income part of the surface mass balance of a mountain glacier. Morphology of a glacier and surrounding mountain slopes is the key factor determining the degree of significance of avalanche feeding of a glacier. This is true first of all for the glaciers located in depressions (corrie glaciers, valley glaciers etc.). Moreover, it is avalanche feeding that supports the stability of corrie glaciers, for instance. According to various estimates, contribution of avalanche feeding to the total mass income of the North Caucasus glaciers varies from 3% to 76%.

     At present, two approaches are generally used for prediction of snow avalanches – statistical and physico-mathematical. Both approaches focus mainly on operational forecasts of avalanche emerging. The purpose of the current research was somewhat different – we focused on adaptation of existing techniques of schematizations of avalanche feeding for simulation of the income part of the surface mass balance of a mountain glacier. We employed a cellular automaton model for imitation of the vertical redistribution of snow mass. Such models have been used for quite some time for evaluation of avalanche danger. The simplified algorithm, which was implemented in the numerical experiments, did not account for some important features like physical properties of snow, their change in time as well as snow structure, The only property which changes in the process of the vertical redistribution is snow depth. Indeed, regularities established in the numerical experiments can be attributed to the idealized case. Nevertheless, we demonstrated that it was possible to reproduce basic characteristics of snow post-depositional redistribution in the mountainous terrain using rather simple method. This method is planned to be implemented in a more general surface mass balance model.

 Key words: mountain glacier, accumulation, snow cover, avalanche, avalanche feeding, mathematical model, surface mass balance, cellular automaton.

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[IEEE] О.О. Rybak, Е.А. Rybak, and I.A. Korneva, “DESCRIPTION OF SNOW TRANSPORT AND ACCUMULATION IN MATHEMATICAL MODEL OF SURFACE MASS BALANCE OF MOUNTAIN GLACIER. PART II. PARAMETERIZATION OF AVALANCHE FEEDING,” Monitoring systems of environment, vol. 4, pp. 72–80, Dec. 2019.

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