Experimental Study On Influencing Factors Of Soil Infiltration Rate And Cumulative Infiltration Amount On The Backslope Of Reservoir

With the rapid development of water conservancy and civil engineering construction in China,under natural rainfall conditions,problems such as erosion of slopes and soil erosion caused by soil moisture infiltration are becoming increasingly serious.Soil water infiltration refers to the process of water entering the soil to form soil water.With the increase of rainfall duration,when the rainfall intensity is greater than the soil infiltration intensity,surface runoff will be formed,which will cause water and soil loss.Soil and water loss not only causes structural damage to the soil texture,but also carries a huge impact on the agricultural production through the impact of the sediment flow,and the ecological balance is gradually destroyed.In this paper,the backwater slope of Taolai Reservoir in Daiyue District,Tai’an City,Shandong Province is used as the test site.Artificial rainfall is used to simulate natural rainfall.Through orthogonal test design,A(soil moisture content),B(rainfall intensity),The relationship between C(rainfall duration)and D(vegetation coverage)and soil infiltration rate and cumulative infiltration rate.The relationship between the four factors and infiltration rate and cumulative infiltration rate was plotted and analyzed visually.The method and the method of analysis of variance explore the degree of influence of the four major factors on the infiltration rate and cumulative infiltration.The research results show that:(1)In terms of infiltration rate,of the four major factors,rainfall intensity is the most important factor affecting infiltration rate,followed by vegetation coverage and soil moisture content.Rainfall is the most influential factor affecting infiltration rate.For cumulative infiltration,rainfall duration is the most important factor affecting cumulative infiltration,followed by rainfall intensity and vegetation coverage,and soil moisture content is the most minor factor affecting cumulative infiltration.(2)With the increase of soil moisture content and rainfall duration,the infiltration rate gradually decreases.With the increase of rainfall intensity and vegetation coverage,the infiltration rate gradually increased.(3)Through the analysis of the variance of each factor and the infiltration rate,the F value of the test statistic is calculated,and it is found that the degree of influence of each factor on the infiltration rate is not significant,but the statistical value F_B>F_D>F_A>F_C,Indicating that rainfall intensity has the greatest effect on infiltration rate,followed by vegetation coverage and soil moisture content,and the effect of rainfall duration on infiltration rate has the smallest effect.(4)After analyzing the variance of each factor and the cumulative infiltration amount,and comparing the F value of the test statistic,we get F_C>Fα,which shows that the rainfall duration has a significant effect on the cumulative infiltration amount,and the other three factors affect the cumulative infiltration amount The degree is not significant.The test statistical value F_C>F_B>F_D>F_A indicates that the duration of rainfall has the greatest effect on the cumulative infiltration,followed by rainfall intensity and vegetation coverage,and the soil moisture content has the smallest effect on the cumulative infiltration.In this paper,through artificial simulated rainfall tests,the relationship between the four major factors and the soil infiltration rate and cumulative infiltration amount of the backslope of the reservoir is studied.