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|Title:||Two-dimensional QUICKEST : solution of the depth-averaged transport-dispersion equation|
|Authors:||Hall, Ross W.|
Chapman, Raymond S.
|Keywords:||Finite element method|
Water quality--Measurement--Mathematical models
|Publisher:||Environmental Laboratory (U.S.)|
U.S. Army Engineer Waterways Experiment Station.
|Series/Report no.:||Technical Report;EL-85-3|
|Abstract:||This study details the derivation of a third-order accurate, explicit, finite-difference scheme (QUICKEST) for the solution of the depth-averaged transport-dispersion equation and compares its performance to an existing third-order accurate Lagrangian algorithm (12-POINT). Test comparisons included both one- and two-dimensional transient transport. Performance criteria examined included numerical diffusion/amplitude, phase, and mass conservation errors. Results presented show that both schemes possess favorable amplitude and phase characteristics. However, unlike QUICKEST, which is mass conservative, the 12-POINT scheme exhibits mass conservation errors that are directly attributable to the time step employed. Neglect of the cross-derivative terms in the QUICKEST formulation results in increased diffusion/amplitude errors as grid density decreases or time step increases. The work presented herein is preliminary to the development of a general purpose, depth-integrated water quality model. Of the two third-order finite schemes examined, QUICKEST is far superior for engineering applications where practical grid spacing and time steps are essential.|
|Appears in Collections:||Technical Report|
Files in This Item:
|TR EL-85-3.pdf||2.04 MB||Adobe PDF|