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CCHE2D cohesive sediment transport model in freshwater
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|Title: ||CCHE2D cohesive sediment transport model in freshwater|
|Authors: ||Zhu, Tingting|
Wang, Sam S.Y.
|Keywords: ||Sediment transport;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: ||Cohesive sediment has been increasingly concerned for its potential threat to environment and
ecological systems as it is a media for accumulating toxic organic chemicals and heavy metals
through adsorption. The transport processes of cohesive sediments are quite different from that of
non-cohesive sediment, which include flocculation, settling, deposition, consolidation and erosion.
One of the most important factors which make the difference is flocculation. In freshwater rivers
turbulence is the most dominant factor in cohesive sediment transport processes.
CCHE2D model is a two-dimensional depth-integrated free surface hydrodynamic model. It
has three modes of turbulence closure, which can give a realistic estimation of the turbulence
intensity of the flow. In this study, a process-based module for cohesive sediment transport in
freshwater was developed and integrated with CCHE2D model. The module represents the bed
sediments in three-dimension with a number of vertical layers based on their consolidation time
(Td) and layer thickness. Bed sediment material properties can be given as initial condition and/or
estimated using empirical formulae during the simulation. The effects of turbulence on flocculation,
settling of flocs and the effects of consolidation on erosion are taken into account. The erosion rate
is calculated using formula of Gailani et al. (1991). The deposition rate is simulated using empirical
formula proposed by Burban et al. (1990).|
|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.|
|Appears in Collections:||Proceedings of the 7th International Conference on HydroScience and Engineering (ICHE 2006) [ISBN: 0977447405]|
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