An Integrated Media, Integrated Processes Watershed Model – WASH123D: Part 8 – Reactive Chemical Transport in Subsurface Media

Fan Zhang, Gour-Tsyh Yeh, Jack Parker, Scott Brooks, Molly Pace, Young-Jin Kim, Philip Jardine & Fan Zhang
A watershed system includes river/stream networks, overland regions, and subsurface media. This paper presents a reaction-based numerical model of reactive chemical transport in subsurface media of watershed systems. Transport of M chemical species with a variety of chemical and physical processes is mathematically described by M partial differential equations (PDEs). Decomposition via Gauss-Jordan column reduction of the reaction network transforms M species reactive transport equations into M reaction extent-transport equations (a reaction extent is a...
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