A simulation model for chemical spills in the upper St Lawrence River

A two-dimensional Lagrangian computer model to simulate the transport of chemical spills in the upper St. Lawrence River is developed. The model considers the spilled chemical to be transported in the river as a mired layer over the depth of the flow and a bottom layer along the bed, with continuous exchange between the two layers. The transport and fate processes include advection/diffusion, sorption/desorption, settling, resuspension, diffusive exchange between sediment/water interface, and can include volatilization, photolysis, hydrolysis, and biodegradation. The model is an integrated part of contingency plan for containment, control and cleanup of possible chemical spills in the upper ST. Lawrence River.