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1. To replicate the bar formation using a 2D hydraulic model with morphodynamic component
2. To understand the reason(s) for the bar formation and to apply lessons learned for future bridge and associated grading work
24,500 Elements
May 7 to 16, 2015 - 239.75 hours
1. Southern portion of bar was able to be approximated using SRH-2D and its sediment transport module, with the MPM relationship.
2. Running the sediment transport model for a longer period of record with higher flows may increase the reproductivity of the bar, especially the northern portions.
3. The engineered channel cross-section upstream and under the bridge was prone to 1-3 feet of sedimentation by gravels and sands even during a single 10-day runoff event.
4. We want to be careful in assuming that a larger bridge opening will necessarily lead to lower BFEs, especially when the active channel is more narrow than the opening. Grading can be optimized through a hydraulic structure by a morphodynamic model.
5. Though the new structure handles the 1% recurrence flood much better than the previous structure, more consideration should be paid to more typical flows throughout the year, especially where good quality real-time data is available. In bridge design, we often prioritize the high flows at the expense of understanding the lower flow regime.