RESEARCH ARTICLE


Computation of Normal Depth in Parabolic Cross Sections Using The Rough Model Method



Bachir ACHOUR
Research Laboratory in Subterranean and Surface Hydraulics, Biskra University, PO Box 145 RP 07000 Biskra Algeria.


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Creative Commons License
© 2014 Bachir ACHOUR;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Research Laboratory in Subterranean and Surface Hydraulics, Biskra University, PO Box 145 RP 07000 Biskra Algeria; Tel: 00213557263947; Fax: 0021333742481; E-mail: bachir.achour@larhyss.net


Abstract

A new method is applied to calculate the normal depth in an open channel of parabolic cross section. This is the rough model method whose main particularity is to ignore the flow resistance coefficients, such as Chezy’s coefficient and manning’s roughness coefficient. The method is applied to a referential rough model, whose friction coefficient is constant, which explicitly express the hydraulic and geometric characteristics of the model such as aspect ratio. By means of a non-dimensional correction factor, the normal depth is explicitly deduced. The rough model method is applicable to the entire domain of turbulent flow.

Keywords: Discharge, energy slope, Normal depth, Parabolic channel, Rough model method, Turbulent flow.