A Study On The Water Infiltration Law Of Frozen Snowmelt In Seasonally Frozen Soil Regions

In this paper,the seasonal frozen soil in Hulan Experimental Field of Heilongjiang University,Harbin,Heilongjiang Province was used as the research object.The soil infiltration test and indoor simulated infiltration test in the field were carried out,and the water content of the section(sentiment),ground temperature and temperature were observed.And the change process of the depth of frozen soil,using the data analysis software Orign2016,SPSS18.0 to analyze the test results,based on mathematical statistics theory,using multiple linear regression method to simulate the infiltration process,the main results are as follows:(1)Analysis of soil infiltration process shows that the infiltration law of frozen and non-frozen soils is basically the same.,and the cumulative infiltration of soil increases rapidly first.Over time,the cumulative infiltration of soil increases slowly until stable infiltration is achieved.The infiltration of soil during freezing is much lower than that of unfrozen soil,and seasonal frozen soil has a hypotonic effect.(2)The surface temperature of the soil,the average moisture content of the soil surface layer,and the depth of the frozen soil have significant effects on soil infiltration.Both affect the infiltration capacity by affecting the hydraulic conductivity.By reducing the hydraulic conductivity,the cumulative infiltration is greatly reduced.(3)The melting of seasonal frozen soil can be roughly divided into three stages,namely melting in the early stage of melting snow,melting in the middle of melting snow and melting in the late stage of melting snow.In the different periods of the process of snowmelt infiltration,select typical infiltration models,such as Kostiakov model,Horton model,Philip model and general empirical model to fit the infiltration rate.Finally,it is concluded that the general empirical model has the best fitting degree of freezing and thawing soil in Hulan test site.(4)Established 90 min soil cumulative infiltration and soil surface water content,soil moisture content(20 cm soil depth),soil temperature(20 cm soil depth),soil temperature(40 cm soil depth),air temperature and frozen soil The depth of the multiple linear regression model,the model is significant.It can reflect the infiltration of seasonal frozen soil in Hulan Experimental Field of Heilongjiang University to some extent.