ISO-9123-2001.pdf
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1、INTERNATIONAL STANDARD ISO 9123 First edition 2001-11-15 Reference number ISO 9123:2001(E) ISO 2001 Measurement of liquid flow in open channels Stage-fall-discharge relationships Mesure de dbit des liquides dans les canaux dcouverts Relations hauteur-chute-dbit Copyright International Organization f
2、or Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 22:01:17 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 9123:2001(E) ii ISO 2001 All rights reserved PDF disclaimer This PDF file may con
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5、rameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2001 All rights reserved. Unless other
6、wise specified, no part of this publication may be reproduced or utilized in any form or by any means, elec- tronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs mem- ber body in the country of the requester. ISO copyr
7、ight office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not f
8、or Resale, 04/19/2007 22:01:17 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 9123:2001(E) ISO 2001 All rights reserved iii ContentsPage 1Scope .1 2Normative references .1 3Terms and definitions 1 4Units of measurement 1 5General considerations .1 6Unit-fall method 3 7
9、Constant-fall method 5 8Variable-fall method 9 9Rating curves and tables 14 10Method of computation .14 11Periodic checking of stage-fall-discharge ratings 14 12Extrapolations .14 13Uncertainties 14 Copyright International Organization for Standardization Provided by IHS under license with ISO Licen
10、see=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 22:01:17 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 9123:2001(E) iv ISO 2001 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of nati
11、onal 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. Internat
12、ional organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the ru
13、les given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the po
14、ssibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 9123 was prepared by Technical Committee ISO/TC 113,Hydrometric determinations, Subcommi
15、ttee SC 1,Velocity area methods. This first edition of ISO 9123 cancels and replaces Technical Report ISO/TR 9123:1986, which has been technically revised. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 N
16、ot for Resale, 04/19/2007 22:01:17 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARDISO 9123:2001(E) ISO 2001 All rights reserved 1 Measurement of liquid flow in open channels Stage-fall- discharge relationships 1Scope This International Standard specif
17、ies methods for determining stage-fall-discharge relationships for a stream reach where variable backwater occurs either intermittently or continuously. Two gauging stations, a base reference gauge and an auxiliary gauge are required for gauge height measurements. A number of discharge measurements
18、are re- quired in order to calibrate the rating to the accuracy required by this International Standard. The preparation of rating curves is not described in detail in this International Standard. NOTEFor a more detailed description of preparing rating curves, see the methods described in ISO 1100-2
19、 2Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publica- tions do not apply. However, parties to agre
20、ements based on this International Standard are encouraged to investi- gate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain reg-
21、isters of currently valid International Standards. ISO 772,Hydrometric determinations Vocabulary and symbols. ISO 1000,SI units and recommendations for the use of their multiples and of certain other units. ISO 1100-2,Measurement of liquid flow in open channels Part 2: Determination of the stage-dis
22、charge relation. 3Terms and definitions For the purposes of this International Standard, the terms and definitions and symbols given in ISO 772 apply. Note, however that the application of the definition of backwater given in ISO 772 to the determination of discharge under intermittent or continuous
23、 backwater conditions should take into account that a higher gauge height would prevail for a given discharge than would be the case if the variable backwater was not present. 4Units of measurement The International System of Units (SI System) is used in this International Standard in accordance wit
24、h ISO 1000. 5General considerations 5.1Importance of backwater Most programmes for collecting records of discharge of streams are based on the fact that a relatively simple relationship exists between gauge height and discharge so that, by simply recording gauge height and developing the stage-disch
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