Simulation of infiltration into typical triangular layered purple soils

Infiltration processes in typical triangular layeredpmple soils are first investigated using indoor mil infiltration devices.The devices are designed to have two distinct triangular layered soilprofiles, which are soarse-to-fine and fine-to-coarse in soil textures from surface to bottom.Experimental results show that the wetting front advance appears to be faster in the first half of the layered mil column compared to that of the second half in the coarse-to-fine soil infiltration device.The opposite result is obtainedwith the fine-to-coarse mil infiltration device.Observation from the fine-to-coarse mil infiltration device shows that the rate of advance of the wetting front increasesmore quicklywith tine in the second half of the layered soil column compared to thatof the first half in the coarse-to-fine mil infiltration device.However, there is no significant rate difference in the finer portions of layered mil columns on both devices.The inclined wetting front rate is found to be sinilaron both devices, which indicates that the mil texture has almost no influence on the rate.A mathematicmodel for simulating infiltration into triangular layered mils is developed using the power relationship and validated by the experimental data.The modeling result is in a good agreementwith the experinent The model has some physical meaning and can be transformed into the existing empirical models each other.