Finding of the Boundary Conditions for the Safety of Outdoor Work Using the Bioclimatic Indicator Model

Abstract

The purpose of the study is to establish the upper and lower limits of air temperature and wind speed in local areas, that will allow to work outdoors without the risk of frostbite. Materials and methods. Based on daily observational data on air temperature and wind speed at meteorological stations Ossora (fall area 616), Magadan (fall area 645, 646), Vilyuisk (fall area 985, 986), long-term time series of these parameters for the winter season of 2015-2019 were formed. Using a multiplicative model of the bioclimatic index of weather severity, the average monthly and average seasonal values of the bioclimatic index of weather severity D were calculated. Di ≥ 0.37 was chosen as a criterion for the value of the desirability function. Statistical analysis of time series D, air temperature, wind speed on the territory of local fall areas for each month of the winter season was performed. Results. It has been established that the values of the generalized weather severity index Di can differ significantly for different fall areas in each month of the winter season. Boundary values of combinations of air temperature and wind speed are determined, corresponding to the conditions of weather severity "satisfactory and better" for the territories of local fall areas of the missile stages located north of 60 oN for Vostochny cosmodrome rockets. Conclusions. To assess the risk of frostbite, when organizing and planning outdoor work in the cold season, the local values of the generalized weather severity index Di, calculated on the base of a multiplicative model of the bioclimatic weather severity index can be used.