摘要：Most Cities count on networks of underground tunnels for the conveyance of
storm water and wastewater. A storm drainage system usually is designed to
operate with freesurface flow regime, however when a storm exceeds the design
event, the flow in the tunnels may transition from free-surface flow to
pressurized flow. During the pressurization a moving air-water interface
advances into the free-surface region with the potential for generating
unacceptable hydraulic transients. A dynamic transient model has been developed
to simulate the complex and highly dynamic flow during the pressurization of
drainage systems. The model is based on the Interface Tracking Method and the
Characteristics Method. The numerical results are compared against measurements.
The code was used to predict the potential for hydraulic transients in the West
Area CSO Tunnel System of the City of Atlanta. Different design alternatives
were evaluated to mitigate pressure oscillations, backflows and flooding during
storm events.
