MODELING OF HEAVY METAL TRANSPORT AND SOIL EROSION IN SURFACE RUNOFF

S.R. Ramireddygari1, R.S. Govindaraju1, and L.E. Erickson2, 1Department of Civil Engineering, Kansas State University, Manhattan, KS, 66506, Phone: 913-532-7612, FAX: 913-532-7717, and 2Department of Chemical Engineering, Kansas State University, Manhattan, KS, 66506, Phone: 913-532-4313, FAX: 913-532-7372

ABSTRACT A physically-based model was developed for rainfall, runoff, erosion, and solute transport processes on land surfaces under time-varying rainfall events. Kinematic wave approximation was used to describe the overland flow dynamics. Erosion equation was represented as a first-order reaction, with the reaction rate being represented by soil erodibility. The solute transport equations were based on a convective-dispersive model that incorporates rate-limited mass transfer through a laminar boundary layer at the soil surface/runoff water interface. The model has been validated using data available in literature. Results for the erosion and solute transport processes were validated separately. Experiments are planned for complete model validation.

KEYWORDS: modeling, heavy metal transport, soil erosion, overland flow

This paper is from the Proceedings of the HSRC/WERC Joint Conference on the Environment, May 1996, published in hard copy and on the Web by the Great Plains/Rocky Mountain Hazardous Substance Research Center.

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