Abstract:

The features of water infiltration in irregular profile of homogeneous purple soil was investigated by establishing an infiltration model of purple soil with reference to Green-Ampt theory. Profiles of right triangle and inverted right triangle of homogeneous purple soil are set through specialized soil infiltration test device indoor.Results reveal that the wetting front rate of coarse soil is faster than that of fine soil. For the same soil texture, the vertical wetting front rate in triangular profile is faster than that in inverted triangular profile, but the infiltration rate is smaller than that of inverted triangular profile. In the early stage of infiltration, the inclined wetting front rate in triangular profile is faster than in inverted triangular profile, and then gradually gets slower than inverted triangular profile. The wetting front, infiltration rate display obvious power function relationship with time. The established infiltration model was verified to be consistent with measured data. Meanwhile, it can be transformed with the existing empirical models, and the parameters are of physical meanings.

Key words: purple soil, triangular profile, soil infiltration, homogeneous soil, infiltration model