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Implementation and testing of a non-cohesive sediment library in the 2-dimensional shallow water equations of adaptive hydraulics (ADH)
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|Title: ||Implementation and testing of a non-cohesive sediment library in the 2-dimensional shallow water equations of adaptive hydraulics (ADH)|
|Authors: ||Tate, Jennifer N.|
|Keywords: ||Sediment transport|
|Issue Date: ||11-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: ||Adaptive Hydraulics (ADH) is an unstructured finite element package capable of modeling 2-dimensional and 3-dimensional shallow water equations, 3-dimensional Navier Stokes equations, groundwater equations and groundwater-surface water interaction. ADH solves the hydraulic and transport equations while dynamically adapting the mesh so that a coarse mesh can give results as accurate as a mesh with finer resolution. Another benefit is that one tool and file structure is used for several different applications. Two-dimensional non-cohesive sediment transport is one focus of current additions to the ADH package and the focus of this paper.
Non-cohesive sediment equations have been incorporated into the 2-dimensional shallow water equations of ADH. These equations are taken from accepted results and analyses by Van Rijn, Garcia and Parker, Shields, Krone, and others. Given the boundary flow conditions, the suspended sediment concentrations, bed displacement, and grain size distributions are calculated over time throughout the model domain. This process can be used when simulating single and multiple grain sizes, as well as non-erodable surfaces for steady state or long, time varying flow boundary conditions.
A reach of the Mississippi River north of Memphis, Tennessee, was used as a test domain for the sediment routines. This area experiences times of wetting and drying and contains several non-erodable dike structures and revetments. Several tests were run on this Kate Aubrey reach. Initial runs consisted of a single, steady flow event for two different channel bathymetries and modeled a single grain size. Runs were then made modeling multiple grain transport. A year-long hydrograph was later applied to drive the single grain simulations.
A detailed description of the equation implementation is given in the paper as well as the results and qualitative conclusions for the various simulations conducted.|
|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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