Author: GAEA Technologies
Posts
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MIGRATEv10 vs POLLUTEv10: Advective–Diffusive Transport Comparison
Overview This example compares advective–diffusive transport results from MIGRATEv10 and POLLUTEv10 using identical input conditions. The goal is to evaluate consistency between the two models while highlighting key differences in how they represent contaminant transport. Unlike pure diffusion, this case includes advection, resulting in much faster contaminant migration and earlier breakthrough at depth. Model Setup…
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MIGRATEv10 Example 1: Modeling a RCRA Subtitle D Landfill with a Composite Liner
Introduction MIGRATEv10 Example 1 demonstrates how to model contaminant migration from a U.S. RCRA Subtitle D landfill using a composite liner system and a primary leachate collection system (PLCS). This example is foundational for understanding how engineered barriers control leakage and how contaminants move into underlying groundwater systems. The simulation focuses on a volatile organic…
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MIGRATEv10 Example 2: Composite Liner System with Primary & Secondary Leachate Collection
Introduction MIGRATEv10 Example 2 builds on the fundamentals introduced in Example 1 by incorporating a more advanced landfill design that includes: This example demonstrates how multiple engineered barriers work together to minimize contaminant migration and how MIGRATEv10 models leakage and transport through a layered system. Conceptual Model Overview The modeled landfill system includes: This multi-barrier…
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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…