Title: AN ENHANCED QUASI TWO-DIMENSIONAL RIVER AND FLOOD PLAIN MODEL
Abstract: Flows in rivers and flood plains are generally three-dimensional. However, as found in most flood plain modelling applications, where the flow depth is small compared with lateral dimensions of the inundated area, the flow behaviour can be considered as two- dimensional (2D). Further, the flow is influenced by physical boundaries such as roads, levees, culverts and bridges. In such situations, quasi-2D models appear to provide the best flood profile characteristics with reasonable computer and input data efforts. In this paper an enhanced version of the original University of Witwatersrand cells model is described. The enhancements include improved bridge energy loss modelling, flow over non-horizontal weirs, allowing for constriction scour at bridges, modelling of transverse flow between cells using fluvial relationships, the incorporation of the local acceleration term to facilitate the modelling of tidal efforts, and an improved data entry pre-processor. The model has been successfully applied to a number of flood studies. Two case studies are presented in this paper. (a)
Publication Year: 1994
Publication Date: 1994-11-01
Language: en
Type: article
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