Specialist Hydraulic Engineer U.S. Bureau of Reclamation, Colorado, United States
Abstract Submission: Open channel flow modeling has become popular in recent years due to the advancement of computing hardware and availability of reliable general-purpose 2D models. Simulation of mixed flows in streams - combined presence of pressurized and open-channel flows – is less recognized; therefore, advancements or improvements are needed. The ability of simulating mixed flows is important for any 2D models if they are to be used as general-purpose software as natural streams include always pressurized flows such as those through culverts and bridges.
In this talk, a new mixed flow numerical method is developed by extending the 1D Preissmann-slot method into two dimensions, along with a proposed method for its implementation on an arbitrarily shaped mesh cells. The mixed flow method is then implemented into the widely used 2D model SRH-2D. Various cases are used to verify the validity of the development as well as the accuracy of the method. Application examples are also given with regard to the use of the method to simulate flows through culverts and bridges.
