Frequency Modeling of Open-Channel Flow
Publication: Journal of Hydraulic Engineering
Volume 130, Issue 8
Abstract
A good model is necessary to design automatic controllers for water distribution in an open-channel system. The frequency response of a canal governed by the Saint-Venant equations can be easily obtained in the uniform case. However, in realistic situations, open-channel systems are usually far from the uniform regime. This paper provides a new computational method to obtain a frequency domain model of the Saint-Venant equations linearized around any stationary regime (including backwater curves). The method computes the frequency response of the Saint-Venant transfer matrix, which can be used to design controllers with classical automatic control techniques. The precision and numerical efficiency of the proposed method compare favorably with classical numerical schemes (e.g., Runge–Kutta). The model is compared in nonuniform situations to the one given by a finite difference scheme applied to Saint-Venant equations (Preissmann scheme), first in the frequency domain, then in the time domain. The proposed scheme can be used, e.g., to validate finite difference schemes in the frequency domain.
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Published In
Journal of Hydraulic Engineering
Volume 130 • Issue 8 • August 2004
Pages: 806 - 815
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Aug 8, 2002
Accepted: Dec 9, 2003
Published online: Jul 15, 2004
Published in print: Aug 2004
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