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iDEA: Drexel E-repository and Archives > Drexel Academic Community > College of Engineering > Department of Civil, Architectural,and Environmental Engineering > Proceedings of the 7th International Conference on HydroScience and Engineering (ICHE 2006) [ISBN: 0977447405] > CCHE2D cohesive sediment transport model in freshwater

Please use this identifier to cite or link to this item: http://hdl.handle.net/1860/1500

Title: CCHE2D cohesive sediment transport model in freshwater
Authors: Zhu, Tingting
Jia, Yafei
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.
URI: http://hdl.handle.net/1860/1500
ISBN: 0977447405
Appears in Collections:Proceedings of the 7th International Conference on HydroScience and Engineering (ICHE 2006) [ISBN: 0977447405]

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