[AGE28-P05] Soil hydraulic parameter estimation by evaporation method
Keywords:Soil hydraulic properties
In this study, Toyoura sand, Tottori dune sand, glass beads and silt were used. After soil water retention curves were determined using the simplified method, the VG parameters were estimated to predict unsaturated hydraulic conductivity. With the inverse method, the VG parameters were inversely estimated using HYDRUS-1D program. Results showed that the parameters estimated from both the simplified and inverse methods predicted unsaturated hydraulic conductivity well compared to that determined from the simplified method. On the other hand, those for Toyoura sand, Tottori dune sand and glass beads were not well predicted. In general, the unsaturated hydraulic conductivity in the wet region was overpredicted, while that in the dry region was underestimated when the simplified method was used. Overall, this study shows that the simplified method needs to be carefully used especially for coarse materials, such as sand and glass beads.