Measurement of liquid flow in open channels — Computing stream flow using an unsteady flow model

Mesure de débit de liquides dans les canaux découverts — Calcul de l'écoulement dans un cours d'eau à l'aide d'un modèle d'écoulement non permanent

General Information

Status
Withdrawn
Publication Date
06-May-1998
Withdrawal Date
06-May-1998
Current Stage
9599 - Withdrawal of International Standard
Start Date
10-Dec-2013
Completion Date
10-Dec-2013
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ISO/TR 11627:1998 - Measurement of liquid flow in open channels -- Computing stream flow using an unsteady flow model
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TECHNICAL ISO/TR
REPORT 11627
First edition
1998-05-15
Measurement of liquid flow in open
channels — Computing stream flow using
an unsteady flow model
Mesure de débit de liquides dans les canaux découverts — Calcul de
l'écoulement dans un cours d'eau à l'aide d'un modèle d'écoulement non
permanent
Reference number
ISO/TR 11627:1998(E)
---------------------- Page: 1 ----------------------
ISO/TR 11627:1998(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide
federation of national standards bodies (ISO member bodies). The work of
preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which
a technical committee has been established has the right to be represented
on that committee. International organizations, governmental and non-
governmental, in liaison with ISO, also take part in the work. ISO collab-
orates closely with the International Electrotechnical Commission (IEC) on
all matters of electrotechnical standardization.
The main task of technical committees is to prepare International
Standards, but in exceptional circumstances a technical committee may
propose the publication of a Technical Report of one of the following types:
— type 1, when the required support cannot be obtained for the publi-
cation of an International Standard, despite repeated efforts;
— type 2, when the subject is still under technical development or
where for any other reason there is the future but not immediate possibility
of an agreement on an International Standard;
— type 3, when a technical committee has collected data of a different
kind from that which is normally published as an International Standard
("state of the art", for example).
Technical Reports of types 1 and 2 are subject to review within three years
of publication, to decide whether they can be transformed into International
Standards. Technical Reports of type 3 do not necessarily have to be
reviewed until the data they provide are considered to be no longer valid or
useful.
ISO/TR 11627, which is a Technical Report of type 2, was prepared by
Technical Committee ISO/TC 113, Hydrometric determinations, Subcom-
mittee SC 1, Velocity area methods.
This document is being issued in the Technical Report (type 2) series of
publications (according to subclause G.3.2.2 of part 1 of the ISO/IEC
Directives) as a “prospective standard for provisional application” in the
field of hydrometric determinations because there is an urgent need for
© ISO 1998

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced

or utilized in any form or by any means, electronic or mechanical, including photocopying and

microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet central@iso.ch
X.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
---------------------- Page: 2 ----------------------
ISO ISO/TR 11627:1998(E)
guidance on how standards in this field should be used to meet an ident-
ified need.
This document is not to be regarded as an “International Standard”. It is
proposed for provisional application so that information and experience of
its use in practice may be gathered. Comments on the content of this
document should be sent to the ISO Central Secretariat.
A review of this Technical Report (type 2) will be carried out not later than
three years after its publication with the options of: extension for another
three years; conversion into an International Standard; or withdrawal.
iii
---------------------- Page: 3 ----------------------
TECHNICAL REPORT ISO ISO/TR 11627:1998(E)
Measurement of liquid flow in open channels — Computing stream
flow using an unsteady flow model
1 SCOPE

This Technical Report describes a method for computing continuous records of stream flow in an

open channel through the numerical solution of the one-dimensional unsteady flow equations. Such

an approach is typically identified as an unsteady flow model and generally involves the use of

computers for solution of the flow equations.

Unsteady flow models are appropriate for computing stream flow records at locations where (1) a

single-valued stage-discharge relation does not exist, (2) backwater affects the discharge under

selected or all conditions, (3) flows are affected by tides, or (4) it is not possible to gage the flow using

velocity-area methods. Unsteady flow models also are appropriate for evaluating the effects of changes

in a managed flow regime on downstream conditions prior to the implementation of any changes.

This Technical Report is applicable to steady and unsteady flows, to nominee flows, and to tidal

flows in which there are no significant longitudinal and vertical density gradients. The method is

considered equivalent to, or better than, the commonly used stage-fall-discharge technique

(ISO 1100-1:1996, 7.2 and Annex C) because the method uses information on the physical

characteristics of the channel, including the cross-sectional geometry, channel rugosity and channel

slope, and the method is based on a mathematical description of the physics of fluid flow.

This Technical Report describes the theoretical basis and fundamental assumptions of the technique,

and provides a summary of selected numerical methods used to solve the unsteady flow equations.

Also provided are details on the application of an unsteady flow model, including data requirements,

procedures for model calibration, testing, and appli
...

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