Journal article
Free-surface response to large-scale bed roughness
Proceedings of the Seventh International Conference on Hydroscience and Engineering
18 Apr 2007
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.
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Details
- Title
- Free-surface response to large-scale bed roughness
- Creators
- Ceyda Polatel (Author) - Drexel University (1970-)Marian Muste (Author) - Drexel University (1970-)Virendra C. Patel (Author) - Drexel University (1970-)Thorsten Stoesser (Author) - Drexel University (1970-)
- Publication Details
- Proceedings of the Seventh International Conference on Hydroscience and Engineering
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- DU; College of Engineering; Civil, Architectural, and Environmental Engineering
- Identifiers
- 991014632686604721