A Model for Water Circulation and Solute Transport in Pool Number 2 of the Mississippi River

摘要

Low flow water circulation in Pool No. 2 of the Mississippi River was analyzed and the resulting flow distribution was used for the computation of mass (solute) transport through the system. The study establishes a basis for dynamic water quality modelling at a very short time-scale as appropriate e.g., for dissolved oxygen or suspended solids. The river reach analyzed receives the effluent from the Metropolitan waste treatment plant (Pig's Eye Plant), but has also great recreation potential because of its proximity to the Twin Cities. Pool No. 2 of the Mississippi River has a fairly complex geometry. It was analyzed as a networkk of 17 fixed boundary segments, taking into account gravity forces, bed shear stresses, local (minor) energy losses and wind effects. The hydrodynamic equations were solved for quasi-steady state conditions. The mass transport was analyzed with a cells-in-series type model. The hydrodynamic and transport model described herein is the basis for a water quality model now under development.