DOI: 10.7256/2453-8922.2022.4.39279

Abstract: This paper presents brief results of studying the cryosphere of the Zeravshan and Hissar Ranges. At the same time, the rate of change in the area of glaciers over the past almost one hundred years and the presence and degradation of permafrost during this time were considered. The actual description of the numerical method for estimating the depth of soil freezing based on data on the thickness of the snow cover and air temperature was also given. An example of using this numerical method for estimating the depth of soil freezing on the slopes was given to map the cryolithozone of the Zeravshan and Hissar Ranges. According to the calculations, the ground under the snow cover remains frozen on the Anzob Pass from December to April. The power of the accumulated snow cover can reach one and a half meters or more. At the same time, the soil under the snow-covered surface freezes, according to calculations, by an average of 1.5 m. Thus, the proposed method for calculating the dynamics of the depth of soil freezing based on air temperature data and snow cover thickness made it possible to assess soil freezing as a factor of soil stability during the construction of village and avalanche protection structures. Thus, the Anzob Pass belongs to an area of seasonal freezing of rocks. Considering the gradient of the average annual temperature of rocks, we can conclude that permafrost rocks on the Hissar Range can be expected at altitudes of more than 4,000 meters.

DOI: 10.7256/2453-8922.2022.4.39429

Abstract: This paper considers the problem of monitoring seasonal changes in soil temperature in northern and mountainous areas in light of ongoing climate change. To study seasonal changes in soil temperature, the Moscow State University Meteorological Observatory was used as a model site with the ability to monitor air temperature, snow cover thickness, and ground freezing temperature and depth, which was a prototype of a system for monitoring the state of permafrost soils used in the Arctic and mountain territories. The paper presents the results of monitoring seasonal changes in soil temperature based on numerical modeling of the penetration of seasonal fluctuations in soil temperature in 2014–2017 in the MATLAB environment at the MSU Meteorological Observatory model site. The results of the numerical simulation of the penetration of seasonal temperature fluctuations in the ground at the MSU meteorological site in 2014–2017 in the MATLAB environment are in agreement with the thermometry data, and, therefore, the developed calculation scheme shows fairly good simulation results. This makes it possible to use the calculation scheme to assess the thermal state of frozen soils and assess the stability of foundations and buildings and linear structures located on them in the conditions of the north and mountainous territories. Therefore, the presented methodology can serve as a suitable method for monitoring and preventing the destruction of the studied structures in the conditions of climate warming.