32nd IAHR Congress --International Association of Hydraulic Engineering and Research , 2007-07-01

Title : ENERGY AND MOMENTUM APPROACHES FOR ANALYSIS OF GRADUALLY-VARIED FLOW THROUGH COMPOUND CHANNELS ( Energy and Momentum Approaches for Analysis of Gradually-varied Flow through Compound Channels )

Authors: Seyed Mohammad Reza Alavi Moghaddam , Seyed Mahmood Hosseini ,

Citation: BibTeX | EndNote

Abstract

Energy and momentum approaches can lead to different results in one dimensional analysis of flow through compound channels and therefore a choice between these two equations must be made to analyse the flow. This investigation is an effort to provide some insight into the validity of these two approaches for one dimensional analysis of steady gradually-varied flow through compound channels. To achieve this, at first the energy and momentum equations and a comprehensive form of steady gradually-varied flow governing equation (G.E.) are introduced. As the G.E. shows and it has been reported in the literature, the accuracy of the two approaches depend on two important factors, 1) correct evaluation of friction or energy slopes and 2) selection of a proper functional form for Froude number. It is a common practice to assume that energy and friction slopes are equal and can be estimated by typical resistance equations for corresponding steady uniform flow (conveyance estimation methods). This is a reasonable assumption and is justified because of the inexact empirical methods involved in evaluating the slopes. Then several computed water surface profiles corresponding to experimental data (M1, S1 and S2 types) are developed by combinations of different conveyance methods and Froude number definitions. Finally, experimental data collected in this study and those reported in the literature are used to compare different computed water surface profiles with laboratory measurements. The study indicates that the momentum principle is more consistent with corresponding steady uniform flow energy/friction slope for water surface profile computation in compound channels at least for the profile types considered in this study. Interestingly, this result is independent of the conveyance method used to estimate the corresponding steady uniform flow energy/friction slope.

Keywords

, compound channel, conveyance, energy equation, Froude number, momentum equation, water surface profile
برای دانلود از شناسه و رمز عبور پرتال پویا استفاده کنید.

@inproceedings{paperid:101883,
author = {Alavi Moghaddam, Seyed Mohammad Reza and Hosseini, Seyed Mahmood},
title = {ENERGY AND MOMENTUM APPROACHES FOR ANALYSIS OF GRADUALLY-VARIED FLOW THROUGH COMPOUND CHANNELS},
booktitle = {32nd IAHR Congress --International Association of Hydraulic Engineering and Research},
year = {2007},
location = {ITALY},
keywords = {compound channel; conveyance; energy equation; Froude number; momentum equation; water surface profile},
}

[Download]

%0 Conference Proceedings
%T ENERGY AND MOMENTUM APPROACHES FOR ANALYSIS OF GRADUALLY-VARIED FLOW THROUGH COMPOUND CHANNELS
%A Alavi Moghaddam, Seyed Mohammad Reza
%A Hosseini, Seyed Mahmood
%J 32nd IAHR Congress --International Association of Hydraulic Engineering and Research
%D 2007

[Download]