부산대학교 도서관

A new, simple technique for estimating the parameters of the two‐term Philip infiltration equation was developed and tested using field‐measured data obtained in the northern Chihuahuan desert of New Mexico. The technique simultaneously provided information on the relationship between the Philip equation parameter A, and the field‐measured hydraulic conductivity. The equation was reformulated as I− cKf= 1/2St−1/2, where Iis the infiltration rate, Sthe sorptivity, tthe time, Kfthe field‐measured final infiltration rate, and c, a coefficient relating Kfto the Philip parameter A. The final, steady infiltration rate measured in the field was used for the value of Kf. Regressions of (I− cKf) vs. (1/2t−1/2) for values of cbetween 0 to 1 resulted in optimum cvalues for each treatment along with their corresponding Svalues. For the soils in this area, values for the coefficient cwere sometimes outside the suggested range of 0.33 to 0.67, and were different for each study site. The regression analysis also showed that the value of Scan be highly sensitive to changes in c. Using the values of Sand cdetermined by the proposed method, a comparison was made between computed infiltration rates and measured infiltration rates. The results of this study showed that the prediction method provided adequate fits to field‐measured data, and that the choice of an appropriate cfactor is important in determining infiltration parameters from field data.