Author(s): W. J. Syme; Rusty Jones; Larry Arneson

Linked Author(s): Bill Syme

Keywords: No Keywords

Abstract: In 1998, the TUFLOW 2D Alternating Direction Implicit (ADI) solver of the Shallow Water Equations (SWE) was modified to offer much improved flexibility in representing hydraulic structures. These modifications included staged energy losses, horizontal and vertical constrictions on the 2D elements, and additional energy loss once the structure soffit is surcharged. The added functionality has been used to model box culverts, bridges, and floating pontoons in 2D. More recently Layered Flow Constrictions were developed that provide the ability to define hydraulic structures with multiple elevation based layers where each layer has its own blockage and energy loss characteristics. For example, Layered Flow Constrictions can represent a bridge as four layers: beneath the bridge deck, the bridge deck, the bridge rails, and flow over the top of the rails. A description of the adaptations to the 2D ADI scheme, and discussion on the issues and approaches to modeling hydraulic structures using a 2D solution are provided. A brief outline is presented of research and testing being carried out by the authors to provide guidelines for modeling 2D structures.

DOI:

Year: 2009