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Proceedings of the 7th International Conference on HydroScience and Engineering (ICHE 2006) [ISBN: 0977447405] >
A 3D numerical model of graded sediment transport in nonequilibrium condition
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http://hdl.handle.net/1860/1377
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| Title: | A 3D numerical model of graded sediment transport in nonequilibrium condition |
| Authors: | Bui, Minh Duc
Rutschmann, Peter |
| Keywords: | Sediment transport
River morphodynamics
Bedforms
Fluvial hydraulics |
| Issue Date: | 13-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 computer code FAST3D has been developed to calculate flow and sediment transport in open channels.
In the code the flow field is calculated by solving the full Reynolds-averaged Navier-Stokes equations with k-
ε turbulence model; the bed-load transport is simulated with a non-equilibrium model containing an important
parameter the so-called non-equilibrium adaptation length, which characterizes the distance for sediment to
adjust from a non-equilibrium state to an equilibrium state; the bed deformation is obtained from an overall
mass-balance equation for sediment transport. The governing equations are solved numerically with a finitevolume
method on an adaptive, non-staggered grid. The former model assumed uniform bed material. In order
to take into account the influence of grain size distribution of the bed-surface on the evolution of the bed
topography and consequently also on the flow field, a sediment transport module has been presently developed
at the Institute of Hydraulic Engineering, University of Innsbruck, Austria, for fractional sediment
transport using a multiple layer model. This paper presents the numerical results for sediment sorting and the
bed deformation in a curved alluvial channel under unsteady flow conditions according to Yen and Lee
(1995). The calculations were compared with data from laboratory measurements. Further, the sensitivity of
the simulated results to the non-equilibrium adaptation length is investigated. |
| 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/1860/1377 |
| ISBN: | 0977447405 |
| Appears in Collections: | Proceedings of the 7th International Conference on HydroScience and Engineering (ICHE 2006) [ISBN: 0977447405]
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