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This study presents a simulation model called DAFLOW-BLTM for the simulation of stream discharge and transport of nitrate and selected herbicides in the Mississippi River Basin. The DAFLOW model solves continuity and momentum equations using a Lagrangian solution scheme for one-dimensional, unsteady discharge. The BLTM model routes parcels through the DAFLOW network, accounting for mixing, dilution, dispersion, and zero- and first-order reaction of nitrate, atrazine, and metolachlor. The model successfully routes water and pesticides, showing conservative behavior. The tool is expandable for future use.
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Simulation of stream discharge and transport of nitrate and selected herbicides in the Mississippi River Basin Robert E. Broshears, Gregory M. Clark, and Harvey Jobson, 2001 Hydrological Processes 15:1157-1167
Diffusion Analogy Flow Model (DAFLOW) • Solves continuity and momentum equations • Lagrangian solution scheme • One-dimensional, unsteady discharge • Calibration to WY 1996 hydrographs • Validation with WY 1992-1994 data
Branched Lagrangian Transport Model (BLTM) • Routes parcels through DAFLOW network • Mixing, dilution, dispersion • Zero- and first-order reaction • Nitrate, atrazine, metolachlor
Summary • Successful routing of water • Successful routing of pesticides and nitrate • Conservative behavior • Expandable tool
