Research On Migration And Accumulation Of Snow Melting Agent In Ski Resort Based On SWAT Model

The ice skiing industry in my country is developing rapidly.The skiing venues are generally in mountainous areas,with dense traffic facilities such as roads and parking lots.It is inevitable to use a large amount of snow melting agents when dealing with ice and snow weather.The working principle of snow melting agent is to melt the snow on the road by lowering the freezing point,which brings us a lot of convenience,but many of its hazards have gradually become known.Snow melting agent migrates and accumulates in soil and water system along with surface runoff,and affects water bodies,aquatic organisms,soil,land plants and terrestrial animals.Most of the existing researches on snow melting agents are qualitative researches on the impact of snow melting agents on the environment.In this study,the Yanqing competition area of the Winter Olympics is selected as the core of the research area,and snow melting agents are regarded as non-point source pollution for quantitative research.Strive to make up for the gap in quantitative research on the impact of snow melting agents on the environment,aiming to provide reference and guidance for the engineering application of snow melting agents,and to provide support for improving the management measures of snow melting agents.Taking into account the differences in the price,performance,and environmental impact of different types of deicing agents,the TOPSIS method combined with gray correlation is used to conduct selective research on the use of deicing agents in environments with different degrees of coldness and sensitivity,and determine the advantages of different environments.Different deicing agent adaptation schemes.After the deicing agent plan is selected for the study area,the deicing agent is added to the ice and snow pavement to form a water,ice,and deicing agent solution physical model(Water-Ice-Salt,WIS for short),and the simulation software Star-CCM+ is used as the research tool to simulate snow melting Process to determine the standard dosage of snow melting agent under different weather conditions.Finally,the study area is selected to construct a SWAT model,combined with weather data to input the amount of snow melting agent,to simulate and predict the migration and accumulation of snow melting agent in the soil and water system in the Yanqing competition area of the study area.This study uses the TOPSIS evaluation model combined with gray correlation to evaluate the five commonly used snow melting agents,sodium chloride,calcium chloride,magnesium chloride,chloride salt mixed snow melting agents,and calcium and magnesium acetate,in four specific environments with high cold and high sensitivity.The merits and demerits of the deicing agent are evaluated in areas with high cold and low sensitivity,low cold and high sensitivity,and low cold and low sensitivity.The type of deicing agent selected in this study is magnesium chloride deicing agent.The simulation software Star-CCM+ is used as a research tool to simulate the process of road snow removal,considering environmental factors such as ambient temperature,wind speed,and snowfall level,to simulate the melting process of the WIS physical model.In the article,the simulated wind speed is 0m/s,1m/s,2m/s,3m/s,the ambient temperature is 0℃,-3℃,-5℃,-7℃,-10℃,and the snowfall is light snow,medium Simulated value of deicing agent dosage for 100 different environmental conditions under snow,heavy snow and blizzard.In order to determine the accumulation of snow melting agent in the soil and water system of the study area,a SWAT model of the study area was established.The optimal snowmelting agent usage plan in the study area was adapted,combined with the area of roads and parking lots in each sub-basin of the study area,and the standard dosage thickness of snow-melting agent under different weather conditions was input in each sub-basin.By analyzing the simulation results of the changes in chloride ion content after the use of snow melting agents in the water system and each sub-basin,and comparing the simulation results with the tolerance of aquatic organisms and plants,it can be seen that the use of snow melting agents will affect the study area The chloride ion content increased,but only in the first part of the research cycle from 2021 to 2027,the chloride ion content increased rapidly.After 2027,the chloride ion content increased gradually and would not have a great impact on the environment such as water and soil.