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Analysis of Shear Stress and Potential Scour of Sediments from Stormwater Catchbasins Sumps Using a 2-Dimentional Computational Fluid Dynamic Model

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A number of research studies have investigated the performance of catchbasins as stormwater quality control devices. However, little information is available on the potential scour of previously captured sediment in hydrodynamic devices, and vendors and stormwater managers are trying to understand its significance. The sediment-retaining performance depends on the size and geometry of the device, the flow rate, sediment size, and specific gravity of the sediment. In the same way, scour of previously captured sediment includes all those parameters previously mentioned, in addition to the depth of the water protection layer above the sediment and the consolidation of the sediment bed due to aging after the sediment was deposited. This paper describes the first phase of a complete research project which will include verification testing using a series of experiments with a full-scale physical model and the implementation of a 3D CFD model to evaluate the hydrodynamics and the scour phenomenon of stormwater hydrodynamic devices. This first phase includes evaluation of significant factors involved in the scour phenomenon conventional catchbasin sumps, the evaluation of shear stress under different flow conditions and depths, and the presentation of initial experimental results obtained from a full-scale physical model and the calibration a 3D CFD model.


Document Type: Research Article


Publication date: October 1, 2007

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