{"id":92254,"date":"2026-04-14T18:00:05","date_gmt":"2026-04-14T18:00:05","guid":{"rendered":"https:\/\/gaeatech.com\/knowledge-center\/?p=92254"},"modified":"2026-04-24T01:14:39","modified_gmt":"2026-04-24T01:14:39","slug":"pollutev10-example-18-phase-change-leachate-system","status":"publish","type":"post","link":"https:\/\/gaeatech.com\/knowledge-center\/pollutev10-example-18-phase-change-leachate-system\/","title":{"rendered":"POLLUTEv10 Example 18: Modeling Phase Change in a Secondary Leachate Collection System"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\" id=\"h-introduction\">Introduction<\/h2>\n\n\n\n<p>POLLUTEv10 Example 18 demonstrates the application of the <strong>Phase Change special feature<\/strong> to simulate contaminant transport within a landfill system that includes a <strong>secondary leachate collection system (SLCS)<\/strong>. This example is particularly valuable for environmental engineers and hydrogeologists interested in modeling <strong>multi-phase contaminant behavior<\/strong> across unsaturated and saturated zones.<\/p>\n\n\n\n<p>The scenario focuses on the migration of <strong>dichloromethane (DCM)<\/strong> under conditions where phase partitioning occurs, influenced by <strong>Henry\u2019s Law<\/strong> in the unsaturated zone. The model incorporates biological decay, layered hydrogeology, and controlled flow conditions to illustrate how phase change affects contaminant transport.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-small-font-size\">\u26a0\ufe0f <em>Important Note:<\/em> This example is hypothetical and intended for instructional purposes only. It should not be used as a direct template for real-world landfill modeling without proper hydrogeologic expertise.<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-conceptual-model-overview\">Conceptual Model Overview<\/h2>\n\n\n\n<p>The modeled system consists of:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A landfill containing a <strong>constant concentration source of DCM<\/strong><\/li>\n\n\n\n<li>A <strong>primary liner<\/strong><\/li>\n\n\n\n<li>A <strong>secondary leachate collection system (SLCS)<\/strong> with distinct unsaturated and saturated zones<\/li>\n\n\n\n<li>A <strong>secondary liner<\/strong><\/li>\n\n\n\n<li>An underlying <strong>1-meter thick aquifer<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-key-feature-phase-change\">Key Feature: Phase Change<\/h3>\n\n\n\n<p>A phase change occurs at the interface between:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Unsaturated zone (0.2 m thick)<\/strong><\/li>\n\n\n\n<li><strong>Saturated zone (0.1 m thick)<\/strong><\/li>\n<\/ul>\n\n\n\n<p>This interface governs how DCM transitions between vapor and dissolved phases, significantly impacting transport behavior.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-hydrogeologic-and-transport-assumptions\">Hydrogeologic and Transport Assumptions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-layered-structure-of-the-slcs\">1. Layered Structure of the SLCS<\/h3>\n\n\n\n<p>The secondary leachate collection system is divided into two conceptual layers:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><th>Layer<\/th><th>Zone Type<\/th><th>Thickness<\/th><\/tr><tr><td>Layer 1<\/td><td>Unsaturated Zone<\/td><td>0.2 m<\/td><\/tr><tr><td>Layer 2<\/td><td>Saturated Zone<\/td><td>0.1 m<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>This layered approach allows POLLUTE to simulate phase-dependent transport properties.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-contaminant-properties-dcm\">2. Contaminant Properties (DCM)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Constant concentration source<\/strong> in the landfill<\/li>\n\n\n\n<li>Subject to <strong>biological decay<\/strong><\/li>\n\n\n\n<li>Exhibits <strong>phase partitioning<\/strong> in the unsaturated zone<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-biological-decay-rates\">Biological Decay Rates<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>Zone<\/td><td>Half-Life<\/td><\/tr><tr><td>Landfill<\/td><td>10 years<\/td><\/tr><tr><td>Primary liner<\/td><td>40 years<\/td><\/tr><tr><td>Secondary liner<\/td><td>40 years<\/td><\/tr><tr><td>Aquifer<\/td><td>40 years<\/td><\/tr><tr><td>Secondary leachate system<\/td><td>No decay<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-diffusion-coefficients\">3. Diffusion Coefficients<\/h3>\n\n\n\n<p>Diffusion varies significantly between zones:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>Zone Type<\/td><td>Diffusion Coefficient<\/td><\/tr><tr><td>Unsaturated Zone<\/td><td>300 m\u00b2\/year<\/td><\/tr><tr><td>Saturated Zone<\/td><td>100 m\u00b2\/year<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>The higher diffusion in the unsaturated zone reflects enhanced vapor-phase mobility, while the saturated zone value represents <strong>increased mixing conditions<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-phase-change-parameter\">4. Phase Change Parameter<\/h3>\n\n\n\n<p>The phase behavior of DCM in the unsaturated zone is governed by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Henry\u2019s Constant = 0.1<\/strong><\/li>\n<\/ul>\n\n\n\n<p>This parameter controls the equilibrium between dissolved and vapor phases, making it critical for accurately simulating contaminant partitioning.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-5-flow-conditions\">5. Flow Conditions<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Darcy velocity through primary liner:<\/strong> 0.003 m\/year<\/li>\n\n\n\n<li><strong>Darcy velocity through secondary liner:<\/strong> 0 m\/year<\/li>\n<\/ul>\n\n\n\n<p>This creates a controlled system where flow is limited to the primary liner and lateral movement occurs within the saturated portion of the SLCS.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-modeling-approach-in-pollutev10\">Modeling Approach in POLLUTEv10<\/h2>\n\n\n\n<p>To implement this example in POLLUTEv10:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-step-1-define-layered-geometry\">Step 1: Define Layered Geometry<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Input two layers for the SLCS:\n<ul class=\"wp-block-list\">\n<li>Unsaturated (0.2 m)<\/li>\n\n\n\n<li>Saturated (0.1 m)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-step-2-assign-transport-properties\">Step 2: Assign Transport Properties<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Set diffusion coefficients for each layer<\/li>\n\n\n\n<li>Define Darcy velocities for liners<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-step-3-enable-phase-change-feature\">Step 3: Enable Phase Change Feature<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Activate the <strong>Phase Change option<\/strong><\/li>\n\n\n\n<li>Input <strong>Henry\u2019s Constant (0.1)<\/strong> for the unsaturated zone<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-step-4-apply-decay-parameters\">Step 4: Apply Decay Parameters<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Assign appropriate half-lives to each domain<\/li>\n\n\n\n<li>Ensure no decay is assigned to the SLCS<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-step-5-define-source-conditions\">Step 5: Define Source Conditions<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use a constant concentration boundary at the landfill base<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-step-6-run-simulation\">Step 6: Run Simulation<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Analyze concentration profiles across layers<\/li>\n\n\n\n<li>Evaluate the impact of phase change on transport<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-graphical-output-depth-vs-concentration\">Graphical Output: Depth vs Concentration<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1007\" height=\"910\" src=\"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/04\/image-29.jpg\" alt=\"\" class=\"wp-image-92255\" srcset=\"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/04\/image-29.jpg 1007w, https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/04\/image-29-300x271.jpg 300w, https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/04\/image-29-768x694.jpg 768w\" sizes=\"auto, (max-width: 1007px) 100vw, 1007px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-pdf-report\">PDF Report<\/h2>\n\n\n<div class=\"ead-preview\"><div class=\"ead-document\" style=\"position: relative;padding-top: 90%\"><div class=\"ead-iframe-wrapper\"><iframe src=\"\/\/docs.google.com\/viewer?url=https%3A%2F%2Fgaeatech.com%2Fknowledge-center%2Fwp-content%2Fuploads%2F2026%2F04%2Fpollute-example18.pdf&amp;embedded=true&amp;hl=en\" title=\"Embedded Document\" class=\"ead-iframe\" style=\"width: 100%;height: 100%;border: none;position: absolute;left: 0;top: 0;visibility: hidden;\"><\/iframe><\/div>\t\t\t<div class=\"ead-document-loading\" style=\"width:100%;height:100%;position:absolute;left:0;top:0;z-index:10\">\n\t\t\t\t<div class=\"ead-loading-wrap\">\n\t\t\t\t\t<div class=\"ead-loading-main\">\n\t\t\t\t\t\t<div class=\"ead-loading\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/plugins\/embed-any-document\/images\/loading.svg\" width=\"55\" height=\"55\" alt=\"Loader\">\n\t\t\t\t\t\t\t<span>Loading&#8230;<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"ead-loading-foot\">\n\t\t\t\t\t\t<div class=\"ead-loading-foot-title\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/plugins\/embed-any-document\/images\/EAD-logo.svg\" alt=\"EAD Logo\" width=\"36\" height=\"23\"\/>\n\t\t\t\t\t\t\t<span>Taking too long?<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<p>\n\t\t\t\t\t\t\t<div class=\"ead-document-btn ead-reload-btn\" role=\"button\">\n\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/plugins\/embed-any-document\/images\/reload.svg\" alt=\"Reload\" width=\"12\" height=\"12\"\/> Reload document\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<span>|<\/span>\n\t\t\t\t\t\t\t<a href=\"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/04\/pollute-example18.pdf\" class=\"ead-document-btn\" target=\"_blank\">\n\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/plugins\/embed-any-document\/images\/open.svg\" alt=\"Open\" width=\"12\" height=\"12\"\/> Open in new tab\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-interpretation-of-results\">Interpretation of Results<\/h2>\n\n\n\n<p>This example highlights several important behaviors:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-enhanced-transport-in-unsaturated-zone\">1. Enhanced Transport in Unsaturated Zone<\/h3>\n\n\n\n<p>Due to higher diffusion and vapor-phase mobility, DCM can migrate more rapidly in the unsaturated portion.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-mixing-dominated-saturated-zone\">2. Mixing-Dominated Saturated Zone<\/h3>\n\n\n\n<p>The lower diffusion coefficient still reflects significant mixing, leading to lateral spreading within the SLCS.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-impact-of-phase-partitioning\">3. Impact of Phase Partitioning<\/h3>\n\n\n\n<p>Henry\u2019s Constant controls how much DCM transitions into vapor form, influencing:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Vertical flux<\/li>\n\n\n\n<li>Concentration gradients<\/li>\n\n\n\n<li>Breakthrough timing<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-role-of-biological-decay\">4. Role of Biological Decay<\/h3>\n\n\n\n<p>Decay reduces concentrations over time, particularly in the landfill and underlying aquifer, but not within the SLCS.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-key-takeaways\">Key Takeaways<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <strong>Phase Change feature<\/strong> in POLLUTEv10 is essential for modeling contaminants that partition between phases.<\/li>\n\n\n\n<li>Accurate representation of <strong>unsaturated vs. saturated conditions<\/strong> is critical.<\/li>\n\n\n\n<li><strong>Henry\u2019s Law<\/strong> plays a central role in volatile contaminant transport.<\/li>\n\n\n\n<li>Layered modeling allows for realistic simulation of landfill systems.<\/li>\n\n\n\n<li>This example reinforces the importance of <strong>site-specific parameterization<\/strong>.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-final-thoughts\">Final Thoughts<\/h2>\n\n\n\n<p>Example 18 provides a powerful demonstration of how POLLUTEv10 can simulate complex environmental processes involving <strong>multi-phase transport and layered hydrogeology<\/strong>. While simplified, it introduces key concepts necessary for advanced contaminant migration modeling.<\/p>\n\n\n\n<p>However, real-world applications require:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Detailed site characterization<\/li>\n\n\n\n<li>Calibration against field data<\/li>\n\n\n\n<li>Expert interpretation of results<\/li>\n<\/ul>\n\n\n\n<p>The Phase Change option should only be used when the user fully understands the <strong>physical processes and assumptions involved<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-learn-more-about-our-contaminant-transport-modeling-solutions\">Learn more about our Contaminant Transport Modeling Solutions<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.gaeatech.com\/pollute.php\" target=\"_blank\" rel=\"noreferrer noopener\">POLLUTE and MIGRATE Contaminant Modeling and Landfill Design<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-pollute-examples\">POLLUTE Examples<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/pollutev10-example-1-modeling-a-u-s-rcra-subtitle-d-landfill\/\">POLLUTEv10 Example 1: Modeling a U.S. RCRA Subtitle D Landfill<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/pollutev10-example-2-pure-diffusion-soil-model\/\">POLLUTEv10 Example 2: Pure Diffusion in a Soil Layer (No Sorption)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/pollutev10-example-3-advection-diffusion-aquifer-mixing\/\">POLLUTEv10 Example 3: Advection + Diffusion with Aquifer Mixing<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/pollutev10-example-4-finite-mass-leachate-collection\/\">POLLUTEv10 Example 4: Finite Mass Source with Leachate Collection System<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/pollutev10-example-5-hydraulic-trap-upward-flow\/\">POLLUTEv10 Example 5: Hydraulic Trap (Upward Flow into the Landfill)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/pollutev10-example-6-fractured-till-sorption\/\">POLLUTEv10 Example 6: Fractured Layer with Sorption and Reactive Transport<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/pollutev10-example-7-radioactive-fractured-rock\/\">POLLUTEv10 Example 7: Lateral Migration of a Radioactive Contaminant in Fractured Rock<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/pollutev10-example-8-potassium-diffusion-clay\/\">POLLUTEv10 Example 8: Laboratory Diffusion of Potassium in Clay<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/pollutev10-example-9-phenol-diffusion-freundlich-sorption\/\">POLLUTEv10 Example 9: Diffusion with Freundlich Non-Linear Sorption (Phenol in Clay)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/pollutev10-example-10-landfill-variable-advective-dispersive-transport\/\">POLLUTEv10 Example 10: Time-Varying Advective\u2013Dispersive Transport from a Landfill<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/pollutev10-example-11-time-varying-source-chloride-diffusion\/\">POLLUTEv10 Example 11: Time-Varying Source Concentration with Diffusion (Chloride in Clay)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/pollutev10-example-12-fractured-media-transport-analytical-solution\/\">POLLUTEv10 Example 12: Fractured Media Transport vs Analytical Solution (Tang et al., 1981)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/pollutev10-example-13-2d-dispersion-tdast-analytical-comparison\/\">POLLUTEv10 Example 13: 2D Plane Dispersion vs Analytical Solution (TDAST)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/pollutev10-example-14-passive-sink-landfill-model\/\">POLLUTEv10 Example 14: Modeling a Landfill with Primary and Secondary Leachate Collection Using Passive Sink<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/pollutev10-example-15-leachate-system-failure-variable-properties\/\">POLLUTEv10 Example 15: Modeling Leachate Collection System Failure Using Variable Properties and Passive Sink<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/pollutev10-example-17-composite-liner-landfill-model\/\">POLLUTEv10 Example 17: Modeling a Landfill with Composite Liners and Dual Leachate Collection Systems<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/pollutev10-example-18-phase-change-leachate-system\/\">POLLUTEv10 Example 18: Modeling Phase Change in a Secondary Leachate Collection System<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/pollutev10-example-19-multiphase-diffusion-toluene\/\">POLLUTEv10 Example 19: Multiphase Diffusion of Toluene Through a Geomembrane System<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/pollutev10-example-20-sensitivity-analysis-leachate-system\/\">POLLUTEv10 Example 20: Sensitivity Analysis of Primary Leachate Collection System Failure<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-comparison-between-pollute-and-migrate\">Comparison between POLLUTE and  MIGRATE<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/migrate-vs-pollute-pure-diffusion\/\">MIGRATEv10 vs POLLUTEv10: Pure Diffusion Comparison<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/migrate-vs-pollute-advective-diffusive-transport\/\">MIGRATEv10 vs POLLUTEv10: Advective\u2013Diffusive Transport Comparison<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/wp-admin\/post.php?post=91707&amp;action=edit\">MIGRATEv10 vs POLLUTEv10: Finite Mass Source Comparison<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/migrate-vs-pollute-hydraulic-trap\/\">MIGRATEv10 vs POLLUTEv10: Hydraulic Trap (Finite Mass Source) Comparison<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/migrate-vs-pollute-fractured-layer-sorption\/\">MIGRATEv10 vs POLLUTEv10: Fractured Layer with Sorption Comparison<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Introduction POLLUTEv10 Example 18 demonstrates the application of the Phase Change special feature to simulate contaminant transport within a landfill system that includes a secondary leachate collection system (SLCS). This example is particularly valuable for environmental engineers and hydrogeologists interested in modeling multi-phase contaminant behavior across unsaturated and saturated zones. The scenario focuses on the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":92257,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[858,1632],"tags":[501,1684,685,1683,1672,1682,1627],"class_list":["post-92254","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-contaminant-transport-modeling","category-pollute-examples","tag-contaminant-transport","tag-dcm-transport","tag-environmental-modeling","tag-landfill-hydrogeology","tag-leachate-collection-system","tag-phase-change-modeling","tag-pollutev10"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.5 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>POLLUTEv10 Example 18 \u2013 Phase Change Explained - Knowledge Center<\/title>\n<meta name=\"description\" content=\"Explore 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