Estimation of two layer soil parameters using finite Wenner resistivity expressions

An efficient computer-based method for evaluation of an optimal two-layer soil model from Wenner four probe test data is presented. The method is based on recently developed finite expressions for computation of potential in two-layer soil. The coefficients of the formulae have been readjusted to suit the present application. A computer program SPEF (Soil Parameters Estimation using Finite Expressions) based on the proposed method is described. The accuracy and efficiency of the method are established by determining two-layer soil models for several sets of apparent resistivity data. SPEF is shown to be much more efficient and convenient than programs based on infinite series expressions