부산대학교 도서관

Two methods for the estimation of saturated-unsaturated properties of soil are examined using the field infiltration experiment. The first method by Reynolds and Elrick (1985) is based on the analytical solution where the exponential function for the relative unsaturated hydraulic conductivity is assumed. The second method combines the numerical calculation of unsaturated flow and the optimization algorithm for the estimations of unknown parameters in the van Genuchten's hydraulic relations. It is shown that the unsaturated properties of the soil affect the infiltration rate of water from the drainage facilities. It is also shown that the method by Reynolds and Elrick is useful in the field experiment for the estimation of the saturatedunsaturated hydraulic conductivity. The relation between the suction pressure h and the relative hydraulic conductivity kr is suitably expressed by kr=exp (-α1h2).