Backwater Effects of Bridge Piers and Abutments in 2D - Replication of Physical Model Tests in a 2D Hydrodynamic Model

摘要

Bridge embankments and structures can significantly influence flooding patterns and levels on floodplains. The literature (Austroads 1994; Bradley 1978) provides details of how to estimate contraction and expansion losses and pier losses of bridge embankments and structures for desktop analysis. However, limited guidance is provided as to the application of these losses in a 2D modelling environment. BMT WBM is currently undertaking research that involves the replication of physical flume models tests (undertaken at Colorado State University by Liu, Bradley and Plate, 1957) in the 2D hydraulic model, TUFLOW. The data from these physical flume tests formed the basis of all current literature into the contraction and expansion losses and pier losses of bridges. This paper will present the research that has been undertaken by BMT WBM and discuss its implications for the representation of key structures in 2D flood models.