HR: 0830h
AN: H51C-1060    [PDF]
TI: A New Paradigm of Modeling Two-Dimensional Overland Watershed Water Quality
AU: * Zhang, F
EM: fzhang@pegasus.cc.ucf.edu
AF: University of Central Florida, 12172 Descartes Court, Apt #1, orlando, FL 32826 United States
AU: Yeh, G G
EM: gyeh@mail.ucf.edu
AF: University of Central Florida, Department of Civil & Environmental Engineering University of Central Florida, Orlando, FL 32816 United States
AB: This paper presents the development of sediment and reactive chemical transport under non-isotherm condition in two-dimensional overland watershed system. Through decomposition of reaction network via Gauss-Jordan column reduction, (a) redundant fast reactions and irrelevant kinetic reactions are removed from the system; (b) fast reactions and slow reactions can be decoupled; (c) species reaction equations are transformed into two sets: equilibrium species mass action equations and kinetic-variable reaction equations. This enable our model to include as many types of reactions as possible, choose kinetic-variables instead of chemical species as primary dependent variables, and simplify the reaction terms in transport equations. In our model two options are provided to solve the advection-dispersion transport equation: Lagrangian-Eulerian approach, and Finite Element Method in Conservative Form, and three options to deal with the reaction term: Fully-implicit, Predictor-corrector, and Operator-splitting methods. The production-consumption rate of chemical species is determined by reaction-based formulations. One example problem is employed to demonstrate the design capability of the model and the robustness of the numerical simulations.
DE: 1800 HYDROLOGY
DE: 1815 Erosion and sedimentation
DE: 1831 Groundwater quality
DE: 1832 Groundwater transport
DE: 1871 Surface water quality
SC: Hydrology [H]
MN: 2003 Fall Meeting