The University will develop a high-fidelity, computational model of turbulent flow and scour at the foundations of the I-694 Bridge, Bridge No. 9321, including a sufficiently long reach of the Mississippi River containing this bridge. The proposed model will be based on the St. Anthony Falls Laboratory (SAFL) Virtual StreamLab (VSL3D) model, which is a state-of-the-art, high-performance computing (HPC), coupled hydro-morphodynamic numerical model capable of simulating turbulent flow, sediment transport and scour in real-life waterways with embedded hydraulic structures. River bathymetry and bridge foundation geometry data, to be provided by MnDOT, will be used to develop a high-resolution model of the Mississippi River
reach containing the bridge section. The model will extend from approximately 2 km upstream of bridge (near Manomin Park)to about 0.5 km downstream of the bridge location to ensure that the complex approach flow to the bridge section is correctly simulated. The computational model will be used to investigate computationally bridge foundation scour scenarios under 100-year and 500-year flooding events. The results of the simulations will be analyzed to determine the scour depths/scour potential
along the pier foundations for Bridge No. 9321, and to determine if scour protection or monitoring is necessary.