A validation study of the physical based pesticide leaching model WAVE is presented. The model considers a mechanistic description of 1-D water, solute and heat transport. Linear sorption isotherms and ®rst order degradation sub-models are used to simulate pesticide sorption and transformation. The ®rst order degradation rates are reduced when temperature and moisture stress in the soil pro®le ...

Advanced numerical simula on models can poten ally help improve guidelines for irriga on and salinity management. Many simula on model parameters have considerable uncertainty, and ideally that uncertainty should be refl ected in model predic ons and recommenda ons. In this work, we inves gate solute transport predica on intervals that can be generated by propaga ng model parameter uncertainty ...

The composition of fuels, mixed-solvent wastes and other contaminants that find their way into the subsurface are frequently chemically complex. The dispersion and diffusion characteristics of multicomponent solutions in soil have rarely been compared to equivalent single-solute systems. The purpose of this work was to examine the diffusive and dispersive transport of singleand multi-component ...

a solute diffuses may cause the observed, or effective diffusion coefficient (De) to be lower than the diffusion Diffusion is often the dominant mode of solute transport in soils coefficient of a compound in water (D0) (Rao et al., when advection is minimal. This paper describes the application of a radial diffusion cell method to estimate the effective diffusion coeffi1980). Moreover, exclusio...

[1] Electrical resistivity tomography (ERT) has proved to be a valuable tool for imaging solute transport processes in the subsurface. However, a quantitative interpretation of corresponding ERT results is constrained by a number of factors. One such factor is the nonuniqueness of the ERT inverse problem if no additional constraints are imposed. In the vadose zone, further problems arise from t...

Although the spatial variability of water content is expected to be significant in heterogeneous, unsaturated media, its effect on solute transport has been neglected in most stochastic analyses. In this work we develop, evaluate, and numerically verify an analytical model describing the statistical moments of water content, soil water flux, soil water velocity, and solute spreading in the unsa...