Author: GAEA Technologies
Posts
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MIGRATEv10 Example 5: Understanding Integration, Accuracy, and the Role of Engineering Judgment
Introduction MIGRATEv10 Example 5 is less about a specific landfill configuration and more about how to use the model intelligently. It emphasizes two critical aspects of contaminant transport modeling: This example highlights that modeling is not just about running software—it’s about understanding when results can be trusted and when additional effort is required. Conceptual Overview…
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POLLUTEv10 Example 5: Hydraulic Trap (Upward Flow into the Landfill)
Introduction Example 5 demonstrates a fundamentally different hydrogeological condition compared to previous cases: a hydraulic trap, where groundwater flow is directed upward into the landfill rather than downward into the aquifer. This scenario is critical in environmental modeling because it represents conditions where contaminant migration is naturally limited or even suppressed due to opposing hydraulic…
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MIGRATEv10 Example 6: Eliminating Negative Concentrations Through Improved Integration
Introduction MIGRATEv10 Example 6 builds directly on Example 5 by addressing a common numerical issue in contaminant transport modeling: 👉 Negative concentrations and flux values These results are non-physical and indicate that numerical integration parameters need adjustment. This example demonstrates how to refine the solution by modifying key Talbot integration parameters, and optionally verifying results…
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POLLUTEv10 Example 6: Fractured Layer with Sorption and Reactive Transport
This example demonstrates the application of POLLUTEv10 for a more complex subsurface condition where fractured media and sorption processes both influence contaminant transport. It builds on previous cases by introducing a fractured till layer beneath a compacted clay liner and modeling a reactive contaminant species that sorbs to soil particles. Conceptual Model Overview The system…
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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…