Soil hydraulic properties are needed in globaland regionalscale circulation models for hydrologic and climate forecasting. They are also necessary in pointand nonpoint-source contaminant transport models. Prediction accuracy of these models is highly dependent on the quality of the model parameters. Collecting the required soil hydraulic parameters by direct measurement at any model grid scale ...

The modified Kovács (MK) model can be considered as one of the most versatile predictive models available to estimate the unsaturated hydraulic functions. The MK model relies on basic geotechnical properties to obtain the water retention curve (WRC), which can then be used to define the relative permeability function. In addition, the model can also take into consideration hysteresis effects an...

be described adequately by a soil hydraulic model that is a closed-form equation with a certain number of paramParametric pedotransfer functions (PTFs), which predict parameeters, e.g., Brooks and Corey or van Genuchten equation. ters of a model from basic soil properties are useful in deriving continuous functions of soil properties, such as water retention curves. The A parametric approach is...

Quantitative laboratory study of pesticide sorption and degradation during transport can provide insight into the basic processes affecting pesticide fate in field soils. Accordingly, we demonstrate the application of analytical solutions of two-site/two-region transport models useful in studying simultaneous pesticide sorption and degradation. Soil-column displacement experiments involving H2O...

This paper investigates the application of Physics-Informed Neural Networks (PINNs) to inverse problems in unsaturated groundwater flow. PINNs are applied types flow modelled with Richards partial differential equation and van Genuchten constitutive model. The problem is formulated here as a known or measured values solution at several spatio-temporal instances, unknown rest domain parameters s...

Residual soils result from chemical weathering, so their characteristics depend on environmental factors, in addition to origin, topography, drainage and geological age. In the unsaturated condition, behavior of is conditioned by suction, which refers state soil under reduced pressure. The aim this study compare water retention curve fitting equations tropical through filter paper technique ana...