Category: Contaminant Transport Modeling
Posts
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MIGRATEv10 Example 3: Pure Diffusion of a Conservative Contaminant
Introduction MIGRATEv10 Example 3 presents a simplified but highly instructive case of pure diffusion of a conservative contaminant through a porous medium. Unlike previous examples, this scenario excludes: This makes it an ideal example for understanding the fundamental physics of diffusion-controlled transport in subsurface environments. Conceptual Model Overview The modeled system consists of: Key Simplification…
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POLLUTEv10 Example 1: Modeling a U.S. RCRA Subtitle D Landfill
This example is a classic scenario used to simulate contaminant transport from a U.S. RCRA Subtitle D landfill with a composite liner system. We’ll break down the setup, key assumptions, model inputs, and interpret the results using graphs and downloadable PDF-style output suitable for reporting. Overview of the Scenario The example models a landfill with:…
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MIGRATEv10 vs POLLUTEv10: Hydraulic Trap (Finite Mass Source) Comparison
Overview This example compares results from MIGRATEv10 and POLLUTEv10 for a hydraulic trap scenario with a finite mass source. A hydraulic trap occurs when upward (negative) advective velocity counteracts downward contaminant migration. In this case: This creates a system where contaminants are partially retained, significantly altering breakthrough behavior compared to standard downward flow cases. Model…
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MIGRATEv10 Example 4: Finite Mass Source and Aquifer Mixing with Base Outflow
Introduction MIGRATEv10 Example 4 builds directly on Example 3 by introducing two critical real-world complexities: This example provides a more realistic representation of landfill behavior by simulating how a limited contaminant mass evolves over time and how it is diluted within a flowing aquifer. ⚠️ Important: This example highlights key hydrogeologic assumptions. Proper application requires…
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POLLUTEv10 Example 2: Pure Diffusion in a Soil Layer (No Sorption)
This example is a fundamental case used to demonstrate pure diffusion of a conservative contaminant through soil. Unlike more complex landfill scenarios, this example isolates diffusion-only transport, making it ideal for understanding baseline contaminant migration behavior. Overview of the Scenario In this example, contaminant transport occurs through: Key simplifications: Conceptual Model The system represents a…
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POLLUTEv10 Example 3: Advection + Diffusion with Aquifer Mixing
This example builds directly on Example 2 by introducing advective transport and a permeable aquifer boundary. This scenario is much closer to real-world landfill hydrogeology, where both diffusion and groundwater flow control contaminant migration. Overview of the Scenario In this example, the system consists of: Key Enhancements from Example 2: Conceptual Model The transport system…
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POLLUTEv10 Example 4: Finite Mass Source with Leachate Collection System
Introduction This example builds directly on the conceptual and numerical framework established in Case 3, introducing a more realistic landfill condition: a finite mass contaminant source combined with an active leachate collection system. This scenario better reflects modern engineered landfills, where contaminant release is limited by waste mass and partially controlled through collection infrastructure. The…
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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…