Three-Dimensional Numerical Simulation of Flow and Pollutant Transport withApplication to a Shallow, Natural Lake

摘要

Presented is development and application of a three-dimensional numericalmodel to study wind-driven flow and associated pollutant transport in a shallowoxbow lake. A parabolic distribution of vertical eddy viscosity was specified toanalyze the wind-driven flow. The model was verified against an analytical solutionof wind-driven flow. The model was then used to simulate the wind-driven flow andpollutant transport in a shallow natural lake in the Mississippi River alluvial plain.Flow within the lake was primarily wind-induced. The flow velocities in the lakewere measured using an acoustic Doppler current profiler. A slug of tracer dye wasinjected into an artificial runoff event into the lake, and the concentrationdistributions within the lake at selected times over two days were obtained. Thesimulated flow currents and dye concentration distributions in the lake werecompared with field measurements, and good agreements were obtained.