Morganza Control Structure Forebay: Numerical Hydraulic Model Investigation
ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS VICKSBURG United States
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Flows and water levels within and approaching the Morganza Control Structure Forebay were investigated with an Adaptive Hydraulics model. The model was used to evaluate the influence of the potato ridge and lower guide levee grades on energy losses and flow patterns within the forebay. The diversion discharge capacity of the Morganza Control Structure is sensitive to computed water levels in the forebay and to estimated water levels at the entrance to the Morganza Floodway. Computed water levels in the forebay are determined by Mississippi River stages and energy losses across the potato ridge and within the forebay. The model simulated Morganza Control Structure operations and diversion discharge under two soft opening scenarios for a provisional project design flood hydrograph. The model demonstrates the potential impacts of the potato ridge grade on the discharge capacity of the Morganza Control Structure. The Adaptive Hydraulics code was modified to permit computation of individual gate discharges based on available operating head across the structure. Additional code enhancements are needed to simplify specification of structure operating rules. These modifications will support future coupling of this model with the Morganza Floodway model and development of a similar coupled model for the Old River Control Complex.
- Civil Engineering
- Fluid Mechanics