Reconstruction of Concentration Boundary Condition for Unsteady Pesticide Transport Modeling

by Deborah J. Mossman, (M.ASCE), Univ of Missouri, Kansas City, United States,
Nael Al Mulki, Univ of Missouri, Kansas City, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


A one-dimensional unsteady contaminant transport model which used an unsteady hydraulic field was used to model pesticides (metolachlor, metribuzin) in the Iowa River/Coralville Reservoir. Eulerian chemistry data were collected during April-July 1986 along three longitudinal points in the impoundment. The water quality model uses a split-operator format for solving the advective-dispersive-reaction equation, and is coupled with a fixed bed through particulate settling and diffusive exchange. The Courant number ranged up to 64 in the water quality model without inducing significant numerical dispersion. Longitudinal dispersion was held at a constant 0.5 m2/sec. The upstream concentration boundary condition was reconstructed by reaching agreement between downstream data and model output. The frequency of data collection suggested that some high concentration events could go unmeasured. The reconstruction was supported by rainfall events which could transport these agricultural chemicals to the river.

Subject Headings: Water quality | Water pollution | Pesticides | Boundary conditions | Rivers and streams | Mathematical models | Hydraulic models | Iowa | United States

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