The geostatistical characteristics of the borden aquifer

摘要: A complete reexamination of Sudicky's (1986) field experiment for the geostatistical characterization hydraulic conductivity at Borden aquifer in Ontario, Canada is performed. The sampled data reveal that a number outliers (low ln (K) values) are present base. These low values cause difficulties both variogram estimation and determining population statistics. analysis shows assuming either normal distribution or exponential log appropriate. classical, Cressie/Hawkins squared median absolute deviations (SMAD) estimators used to compute experimental variograms. None these provides completely satisfactory variograms with exception classical estimator removed from set. Theoretical parameters determined nonlinear (NL) estimation. Differences obtained between NL fits those Sudicky (1986). For classical-screened estimated variogram, produce an variance 0.24, nugget 0.07, integral scales 5.1 m horizontal 0.21 vertical along A–A′. B–B′ 0.37, 0.11, 8.3 0.34. fitted parameter set (horizontal vertical) statistically different than We also evaluate probabilistic form Dagan's (1982, 1987) equations relating tracer cloud's spreading moments. evaluated using estimates covariances line A–A′ as input, velocity equal 9.0 cm/day. results compared actual test, but by Freyberg Rajaram Gelhar (1988). developed this study excellent fit sets calculated plume moments when combined stochastic theory predicting spread cloud.