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Please use this identifier to cite or link to this item: http://hdl.handle.net/1860/1480

Title: Free-surface response to large-scale bed roughness
Authors: Polatel, Ceyda
Muste, Marian
Patel, Virendra C.
Stoesser, Thorsten
Keywords: Large eddy simulation;Computational hydraulics
Issue Date: 12-Sep-2006
Publisher: Michael Piasecki and College of Engineering, Drexel University
Citation: Proceedings of the Seventh International Conference on Hydroscience and Engineering, Philadelphia, PA, September 2006. http://hdl.handle.net/1860/732
Abstract: The state of the free-surface in open-channel flows over large-scale roughness elements is examined experimentally and numerically. Large Eddy Simulation (LES) of the incompressible fully developed turbulent flow in a rectangular channel bounded above by a rigid-wall is performed. The results of the computations are compared with Large Scale Image Velocimetry (LSPIV) measurements. Two roughness types, namely, square cavities and two-dimensional dunes, are tested with a range of flow depth (h) and roughness height (k) to obtain submergence ratios (h/k) of 4 to 8.5. The pressure, vorticity and velocity fields are used to identify the turbulent structures at the free-surface and their relationship with the channel roughness. It is found that the free-surface deformations and the velocity distributions are related to the geometry and relative submergence of the bed roughness elements. The results are used to support ongoing efforts for development of remote discharge measurements techniques.
Description: Paper presented at The Seventh International Conference on HydroScience and Engineering (ICHE) hosted by the College of Engineering at Drexel Univeristy on September 10-13, 2006 in Philadelphia, Pennsylvania. The conference theme was IT in the Field of HydroSciences. It included several mini-symposia that emphasized IT topics in HydroSciences and the yearly meeting of the metadata group of the International Oceanographic Data and Information Exchange organization.
URI: http://hdl.handle.net/1860/1480
ISBN: 0977447405
Appears in Collections:Proceedings of the 7th International Conference on HydroScience and Engineering (ICHE 2006) [ISBN: 0977447405]

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