Research On The Effect Of Snow Cover Characteristic And Radiation Energy On Snow Melting Process

At present,snowmelt erosion has become one of the most important problems in the study of soil erosion in the black soil region of northeast china.Snowmelt runoff is the direct cause of snowmelt erosion.In order to study the snow melting process in the black soil region of Northeast China,the snow melting process was divided into two processes before and after the runoff generation.Through simulation test,analysis of snow depth and density,radiation energy on snowmelt runoff time,before and after the snow to affect snow holding-water capacity and melt-water amount change and snow melting rate,revealing the main influencing factors of snow melting process and its variation,in order to provide some reference for the study on snowmelt runoff process.The main conclusions are as follows:(1)The main influencing factor of snowmelt time is the snow depth.The snowmelt time includes the initial runoff time,the late production time and the total time of snow melting.Changes in snow depth make snowmelt in snow in the migration process becomes complicated,and the effect of snow melting time.Radiant energy is the main cause of snow melting.The increase of radiant energy makes the snow melt and the time of melting snow decrease.Increase the density of snow makes the capillary force between the layers increases,the amount of liquid water can exceed the capillary force out of snow,has hindered the snow melting time.(2)The main factor affecting the variation of snow holding-water capacity is the snow density in the process of snow melting.Increase the density of snow,the snow between the porosity and the capillary force between particles increases,reduces the initial runoff time of snow holding-water capacity,promote the snow melt runoff.The main factor that affects the change of melt-water amount is the snow depth.The increase of snow depth,increasing the capacity of snowmelt water space,increases the movement path of snowmelt water in snow layer,slow snow melt runoff.In the process of snow depth and density,the two affect each other.(3)In the process of snow melting,the main factor is the radiant energy.External energy input is the direct and fundamental cause of snowmelt runoff.The process of snow melting is essentially a complex process of energy transformation and transfer within the snow cover.The increase in energy increases the rate of snowmelt.Variation characteristics of snowmelt runoff process line 4,respectively increase snowmelt runoff with time first increased and then decreased;snowmelt runoff increased gradually with time early,intermediate had a stable stage,later decreased gradually;increase the snowmelt runoff with time gradually increased;increasing snowmelt runoff with time the gradual decline.In this paper,the whole snow melting process is taken as the research object,and the initial runoff time is taken as the demarcation point,and the process is divided into two stages before and after the runoff production.About the snow melting process in the snowmelt period,a more in-depth study,recommendations on the selection of multi factors for simulation test of snowmelt,test results are compared with results from other snowmelt runoff model,the process can provide a reference for the simulation of snowmelt.