HR: 0800h
AN: OS41A-0159    [Abstracts]
TI: An Integrated Model of Hydrodynamics and Water Quality Transport
AU: * Yeh, G
EM: gyeh@mail.ucf.edu
AF: University of Central Florida, Room 442B/C, ENG II, UCF 4000 Central Florida Blvd, Orlando, FL 32816, United States
AU: Shan, H
EM: hshan@uta.edu
AF: University of Texas at Arlington, Department of Mathematics, Arlington, TX 76010, United States
AB: his paper presents the development of a numerical model to simulate integrated hydrodynamics and water quality transport in surface waters. The hydrodynamic module solves three-dimensional Navier-Stokes equations with or without the hydrostatic assumptions, and energy and salinity transport equations. The turbulence is modeled with a generalized transport equation. The moving free surface is explicitly handled by solving the kinematic boundary condition equation using a node-repositioning algorithm. The water quality module solves sediment and reactive biogeochemical transport equations. The set of species transport equations were transformed into three subsets using a general paradigm of diagonalization. The first subset constitutes of algebraic equations of equilibrium variables for fast/equilibrium reactions. The second subset is made of transport equations of kinetic variables for slow/kinetic reactions. Finally, the third subset composes transport equations of components for reaction invariance. The Arbitrary Lagrangian-Eulerian (ALE) representation is adopted for all transport equations. To provide robust, accurate, and efficient simulations, a variety of numerical schemes are provided. These include finite element methods or a combination of finite element and Semi-Lagrangian (particle tracking) methods. The model was applied to the Loxahatchee Estuary river system. The computational domain includes the Loxahatchee estuary, Intracoastal Waterways, and three major tributaries of the river - the South Fork, North Fork, and Northwest Fork. The comparison between model simulations and field data is excellent for tides and adequate for salinities. To demonstrate the flexibility and generality of water quality transport module, three widely used water quality models, WASP5, QUAL2E, and CE-QUAL-ICM, were recast in the mode of reaction networks. Simulations of QUAL2E and WASP5 using the model illustrated that they were treated simply as two examples in light of the general paradigm of modeling reactive biogeochemical transport.
UR: http://people.cecs.ucf.edu/yeh
DE: 1805 Computational hydrology
DE: 1871 Surface water quality
DE: 4534 Hydrodynamic modeling
DE: 4805 Biogeochemical cycles, processes, and modeling (0412, 0414, 0793, 1615, 4912)
DE: 4899 General or miscellaneous
SC: Ocean Sciences [OS]
MN: 2007 Fall Meeting