[A-HW28] Hydrology and Water Environment

[AHW28-P12] Interactive Graphical User Interface for an Analytical Model Describing Three-Dimensional Plume Migration of a Degrading Contaminant

*Cheng-Wen Chen¹, Ching-ping Liang², Zhong-Yi Liao¹, Heejun Suk³, Chen-Wuing Liu⁴, Jui-Sheng Chen¹ (1.Institute of Applied Geology, National Central University, 2. Department of Nursing, Fooyin University, 3.Korea Institute of Geoscience and Mineral Resources, 4.Department of Bioenvironmental Systems Engineering, National Taiwan University)

Keywords:Multispecies contaminant transport, Analytical Modeling

Common groundwater contaminants, such as nitrogen, chlorinated solvents, radionuclides, and pesticides, often degrade into byproducts, resulting in the coexistence of the original contaminants and their degradation products. Analytical models that solve simultaneous advection-dispersion equations (ADEs) coupled with first-order decay reactions provide an effective means to evaluate the transport behavior of these compounds within chemical mixtures. While several analytical models have been developed for multispecies contaminant transport, BIOCHLOR and REMChlor are among the most widely recognized and utilized. However, their applicability is limited to cases where all contaminants share identical retardation factors. To overcome this limitation, we have developed analytical models that account for contaminant-specific retardation factors and incorporate dynamic, time-varying source inlet boundary conditions. Building on these advancements, we introduce MUSt (MultiSpecies Transport Analytical Model)—a commercial software package integrating a FORTRAN-based solver with an interactive Graphical User Interface (GUI). The GUI, developed in C# with Visualization Toolkit (VTK) support, provides a user-friendly platform for model parameter input and enables rapid and intuitive visualization of simulation results. To facilitate application, MUSt includes ten tutorial examples demonstrating its use in modeling BTEX transport, nitrate transformation chains, radionuclide decay chains, and the coexistence of chlorinated solvent contaminants. These tutorials are available on YouTube (https://www.youtube.com/watch?v=kG-gCP-lOvs), offering environmental scientists and engineers a powerful yet accessible tool for contaminant transport modeling and visualization.