Modelling multiple solute transport in variably saturated soils
نویسنده
چکیده
This paper presents two models typical of two different approaches often used for modelling the advective-dispersive transport of multiple ions in variably-saturated porous media. The first approach assumes that all solute reactions can be incorporated directly into the governing transport equations (the one-step method), while the second approach divides the mathematical solution process into two separate steps: one for transport, and one for most or all chemical reactions (the two-step method). The two approaches are illustrated using the one-step CHAIN_2D code which simulates the nonlinear nonequilibrium transport of solutes involved in sequential first-order decay reactions, and the twostep UNSATCHEM-2D code which considers equilibrium and kinetic non-equilibrium chemistry of major ions.
منابع مشابه
Estimation of zeolite application effect on solute transport parameters at different soils using HYDRUS-1D model
ABSTRACT-Application of models for simulation of solute and pollutants transport in soil can reduce time and costs for remediation process. HYDRUS-1D model was developed to simulate the one–dimensional flow of soil water, heat, solute and viruses in variably saturated–unsaturated porous media. The objective of this investigation is to determine the solute transport parameters in disturbed soil ...
متن کاملAn Object-oriented computational framework for the simulation of variably saturated flow in soils, using a reduced complexity model
A simple and efficient computational modelling framework is presented for the simulation of variably saturated flows in porous media, which is not based on a conventional numerical solution of the Richards’ equation. The computational domain is discretized with a regular grid and simple rules govern the flow dynamics. Each cell can have distinct hydraulic properties and its state depends only o...
متن کاملAdvec ve – Dispersive Equa on with Spa al Frac onal Deriva ves Evaluated with Tracer Transport Data
242 A dispersion are considered to be the dominant mechanisms of solute transport in the vadose zone, i.e., the variably saturated layer of soils and sediments between the soil surface and groundwater table (Jury and Flühler, 1992). Advection is associated with the average water fl ux or velocity, whereas hydrodynamic dispersion is modeled using an analog of Fick’s law corresponding to the Brow...
متن کاملSimulation tool for variably saturated flow with comprehensive geochemical reactions in two- and three-dimensional domains
1 We present a software tool for simulations of flow and multi‐component solute transport in 2 two and three‐dimensional domains in combination with comprehensive intra‐phase and 3 inter‐phase geochemistry. The software uses IPhreeqc as a reaction engine to the multi‐ 4 purpose, multidimensional finite element solver COMSOL Multiphysics® for flow and 5 transport simulations. Here we used COMSOL...
متن کامل