High-Resolution Method for Modeling Hydraulic Regime Changes at Canal Gate Structures
Publication: Journal of Irrigation and Drainage Engineering
Volume 136, Issue 12
Abstract
A method for modeling flow regime changes at gate structures in canal reaches is presented. The methodology consists of using an approximate Riemann solver at the internal computational nodes, along with the simultaneous solution of the characteristic equations with a gate structure equation at the upstream and downstream boundaries of each reach. The conservative form of the unsteady shallow-water equations is solved in the one-dimensional form using an explicit second-order weighted-average—flux upwind total variation diminishing (TVD) method and a Preissmann implicit scheme method. Four types of TVD limiters are integrated into the explicit solution of the governing hydraulic equations, and the results of the different schemes were compared. Twelve possible cases of flow regime change in a two-reach canal with a gate downstream of the first reach and a weir downstream of the second reach, were considered. While the implicit method gave smoother results, the high-resolution scheme—characteristic method coupling approach at the gate structure was found to be robust in terms of minimizing oscillations generated during changing flow regimes. The complete method developed in this study was able to successfully resolve numerical instabilities due to intersecting shock waves.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 136 • Issue 12 • December 2010
Pages: 795 - 808
Copyright
© 2010 ASCE.
History
Received: Apr 16, 2009
Accepted: May 2, 2010
Published online: May 11, 2010
Published in print: Dec 2010
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