...Fig. 1. Images of randomly generated van Genuchten parameter fields for loam used in the simulations. (a) log( K s ) with K s in centimeters per day; (b) log(α) with α in (1/cm), | R | 2 = 1.0; (c) log(α) with α in (1/cm), | R | 2 = 0.1; (d) log( n − 1), | R | 2 = 1.0; (e) log( n − 1...

... algorithm that uses a vertical electrical conductivity profile and auxiliary hydrologic data to estimate the van Genuchten parameters and saturated hydraulic conductivity of a homogeneous unsaturated zone. Using a synthetic case, we analyzed the method’s accuracy and sensitivity to temporal and spatial...

... of the coarser sands was found to be far more sensitive to porosity than the finer sands. Simulations of unsaturated conditions showed that the van Genuchten hydraulic parameter α increased nonlinearly with increasing grain size and mean pore body size of the sand mixtures. Compaction caused a linear decrease...

....) orchard in Homestead, FL. Hydrostatic conditions were identified and van Genuchten parameters were determined using the filtered data set and the van Genuchten equation; accuracy of the predictions was assessed with the Nash–Sutcliffe coefficient of efficiency ( C eff ). The greatest variability in soil...

... sensitivity of different outputs (cumulative outflow, water content, and pressure head at different positions inside the column) to the Mualem–van Genuchten parameters was analyzed. In addition, the marginal effects of the parameters on the different outputs were analyzed across their entire uncertainty range...

... using a pedotransfer function. On the basis of sensitivity analysis, hydraulic conductivity k s and van Genuchten parameter n were found to be most sensitive, and these two parameters were therefore subject to calibration at each site using the parameter estimation code PEST. From the calibrated models...

... van Genuchten parameters. The method of mean relative difference (MRD) of soil moisture was used as a diagnostic tool for assessing different climate and soil controls on SMSP. The results show that instead of being controlled by climate variables (e.g., precipitation and potential evapotranspiration...

..., and, if present, the microrelief. In this study, this dependency was used to determine the effective van Genuchten parameters by Bayesian inversion assuming a uniform soil profile. We applied our concept to field data from a peatland with microrelief. Results indicated that observations of water table rises...

.../N ratio. Differences between intrinsic and actual hydraulic properties increased with prolonged dry periods. Contact angles correlated with the air-entry value (inverse of van Genuchten parameter α). This finding offers a way to account for SWR in hydraulic models. * Corresponding author...

...' equation a function of the matric potential is derived to solve the problem of vertical-up, vertical-down and horizontal water infiltration into a sand. The effect of van Genuchten's shape parameters of the soil water retention curve on the application of the solution to other porous media was investigated...

...F ig . 8. The values of Mualem–van Genuchten parameters α and n per layer for different aggregation levels. Each dot is a parameter value for a particular land unit, each + represents the mean of the parameter values per aggregation level. The dots are jittered per aggregation level...

... pedotransfer functions are originally not developed for this purpose. State-space models estimated the spatial process of hydraulic conductivity at a soil water pressure head of −50 cm and the van Genuchten parameter n with relatively narrow confidence bands, whereas for α confidence was larger. Geoelectrical...

..., a methodology is presented for matching Gardner and van Genuchten parameters. The new solution is more realistic than the previous solution for a spherical inclusion with a sorptive number the same as the background but is computationally more tedious. * Corresponding author ( [email protected] ) 11...