Research On Profiles Of Blowing Snow And Snow Distribution On Traffic Line

Wind-induced snow movement is a natural phenomenon that often occurs in cold regions,also known as "blowing snow" or "drifting snow".The drifting snow on traffic routes can reduce visibility affecting transportation,making the accumulation of snow,and is a natural disaster that cannot be ignored.Moreover,the formation and movement of the drifting snow are complex,involving multiphase flow and multi-physical,and there is still no systematic solution.To further study the movement and vertical distribution of drifting snow,this study conducted on-site measurements in the Laofengkou-Mayitasi region of Xinjiang,China.Combined with the research methods of field measurement and numerical simulation,this study used the Mixture multiphase model based on Euler-Euler to investigate the distribution of snow on traffic lines,and also research the prevention measures of drifting snow on traffic lines to provide reference and suggestions on controlling.The main contributions and results of this study can be summarized as follows.1.Research on snow particle size and the profiles of drifting snow.A simplified empirical model of the physical characteristics of drifting snow is proposed in the present study.Based on the current data,we summarize and analyze the snow particle size probability distribution,the mean equivalent diameter profile and the snow mass flux profile when snow drifts.The results show that the probability distribution of the equivalent diameter of different snow particles follows the gamma distribution,and these parameters significantly vary for different types of snow particles.The wall friction velocity is an important factor that affects the profiles of the snow mean equivalent diameter and snow mass flux.The empirical model proposed in this paper coincide well with field measurements.2.Research on the accuracy of the numerical simulation results.The simulation results of the steady-state method and the transient method are analyzed and compared.The simulation results of the transient method are consistent with the measured results.Distortion may occur in the quasi-steady state method.More attention should be paid to the parameter of time when using the quasi-steady state method to simulate the distribution in snow drifts.3.Research on the snow distribution of the typical embankment and road cutting.The transient method was used to simulate the evolution of snow accumulation of the selected sections.Furthermore,the flow field and snow concentration were analyzed to clarify the mechanisms of the snow accumulation.Additionally,snow accumulation evolution of these traffic lines are summarized and analyzed.4.Research on the influence of wind deflector on the snow distribution of the road cutting.A road cutting of the project(the cutting slope ratio is 1:1.5)is selected in this study.Then,the influence of three different types of wind deflectors,vertical,backward and forward,on the road cutting is analyzed based on the parameters of flow field,snow concentration,and the length of the deposition area at the initial stage.The inclination angle of the wind deflector is the key parameter in the engineering design.In practical engineering applications,it is recommended to use the forward inclined wind deflector,and the angle α should be set as near 45°.