Influence of Slope and Rainfall Intensity on Infiltration Characteristics of Lou Soil

In this paper,indoor artificial simulated rainfall was used to investigate the effects and mechanisms of slope and rainfall intensity(RI) on Lou soil infiltration.Adopting mathematical methods,dynamic change of soil infiltration rate and cumulative infiltration were simulated.The results showed that RI influenced infiltration rate and cumulative infiltration obviously.Within the range of rainfall intensity from 20 mm h-1 to 90 mm h-1,larger rainfall intensity led to higher initial infiltration rate and shorter time to reach stable infiltration rate.Mainly subjected to soil characteristics,there were no obvious differences between different treatments in stable infiltration rate.Cumulative infiltration decreased with the increase of RI.Soil infiltration rate and cumulative infiltration did not show obvious difference between different slopes.Using mathematical models to simulate dynamic change of soil infiltration rate and cumulative infiltration,the result showed both Kostiakov model and ARIMA model could be used to simulate infiltration process and fitted better.