Author: GAEA Technologies
Posts
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POLLUTEv10 Example 7: Lateral Migration of a Radioactive Contaminant in Fractured Rock
This example demonstrates how POLLUTEv10 can be used to simulate the lateral migration of a radioactive contaminant in a fractured porous rock system. It focuses on transport along a single set of parallel fractures, incorporating advection, dispersion, matrix diffusion, and radioactive decay. The scenario is particularly relevant for nuclear waste disposal assessments, deep geological repositories,…
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MIGRATEv10 Example 7: Improving Accuracy with User-Selected Fourier Integration
Introduction MIGRATEv10 Example 7 continues the refinement process from Examples 5 and 6 by addressing a persistent issue: 👉 Negative concentrations in the upper 5.6 m of the model domain In this case, the focus shifts from Talbot integration to Fourier integration, specifically how user-selected Gauss integration parameters can significantly improve model accuracy. This example…
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POLLUTEv10 Example 8: Laboratory Diffusion of Potassium in Clay
Laboratory diffusion testing is a cornerstone of contaminant transport analysis in low-permeability soils such as compacted clays. In POLLUTEv10 Example 8, the model is applied to simulate the diffusion of potassium (K⁺) through a clay specimen under controlled laboratory conditions. This example is based on well-established experimental work by R. Kerry Rowe and colleagues, including…
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POLLUTEv10 Example 9: Diffusion with Freundlich Non-Linear Sorption (Phenol in Clay)
In POLLUTEv10 Example 9, the model advances beyond linear sorption by incorporating Freundlich non-linear sorption to simulate the diffusion of phenol through a clay specimen. This example reflects more realistic contaminant behavior, particularly for organic compounds that do not follow simple linear partitioning. Problem Overview This example simulates a laboratory diffusion test with the following…
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MIGRATEv10 Example 8: Evaluating Contaminant Migration at Multiple Lateral Positions
Introduction MIGRATEv10 Example 8 introduces an important advancement in contaminant transport analysis: 👉 Evaluating concentration at multiple lateral positions Rather than focusing on a single point, this example investigates how a pollutant migrates outward from a buried landfill and how concentrations vary at different distances from the source. This approach provides a more realistic understanding…
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POLLUTEv10 Example 10: Time-Varying Advective–Dispersive Transport from a Landfill
Modeling Hydraulic Gradient Reversal with Variable Properties POLLUTEv10 Example 10 demonstrates one of the most powerful capabilities of the model: simulating time-varying transport conditions using the Variable Properties feature. This scenario captures a realistic landfill lifecycle where: Problem Overview This example models: Key Phases Conceptual Model The system includes: The most critical behavior is the…
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MIGRATEv10 Example 9: Comparison with the TDAST Analytical Solution
Introduction MIGRATEv10 Example 9 focuses on model validation by comparing numerical results from MIGRATEv10 with an established analytical solution. The benchmark used is TDAST, a program developed by Javandel et al. (1984) for solving 2-D plane dispersion in infinitely deep porous media. This example demonstrates how closely MIGRATE can reproduce analytical solutions and provides confidence…
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MIGRATEv10 Example 10: Contaminant Transport in Fractured Media with Sorption
Introduction MIGRATEv10 Example 10 introduces a more advanced and realistic scenario by incorporating: This example builds on earlier cases by modeling contaminant migration through a landfill barrier system that includes both compacted clay and a fractured till layer, while accounting for retardation due to sorption. It also serves as the 2-D extension of a similar…
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POLLUTEv10 Example 12: Fractured Media Transport vs Analytical Solution (Tang et al., 1981)
Validating Fracture Transport Modeling with Analytical Benchmarks POLLUTEv10 Example 12 is a benchmark validation case that compares numerical results from POLLUTEv10 with an analytical solution developed by Tang et al.. This example focuses on transport in fractured porous media, where contaminant migration occurs rapidly along fractures and slowly into the surrounding rock matrix. Problem Overview…