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BS ISO 24578:2021

BS ISO 24578:2021

$198.66

Hydrometry. Acoustic Doppler profiler. Method and application for measurement of flow in open channels from a moving boat

Published By Publication Date Number of Pages
BSI 2021 58
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This document gives guidelines for the use of boat-mounted acoustic Doppler current profilers (ADCPs) for determining flow in open channels. It describes a number of methods of deploying ADCPs to determine flow. Although, in some cases, these measurements are intended to determine the stage-discharge relationship of a gauging station, this document deals only with single determination of discharge.

ADCPs can be used to measure a variety of parameters, such as current or stream flow, water velocity fields, and channel bathymetry. As a potential application, an idea of bedload discharge can be obtained applying the bottom track velocity, while suspended sediment flow can be obtained applying the acoustic backscatter and the sonar equation. This document is generic in form and contains no operational details specific to particular ADCP makes and models.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
11 4 Principles of the boat mounted ADCP method
4.1 General
12 4.2 Doppler principle applied to moving objects
13 4.3 Acoustic Doppler current profiler techniques
4.3.1 General
4.3.2 Pulse incoherent
14 4.3.3 Pulse-to-pulse coherent
4.3.4 Broadband (Spread spectrum)
4.4 Measurement of velocity profile
4.4.1 General
4.4.2 Measurement of relative velocity
4.4.3 Measurement of boat velocity
16 4.4.4 Near boundary data collection
18 4.5 Speed of sound in water
19 5 Flow determination
5.1 General method
21 5.2 Measurement procedure
23 5.3 Method dealing with moving-bed condition without GNSS system
5.3.1 General
5.3.2 Stationary moving-bed method
24 5.3.3 Azimuth method
5.3.4 Subsection correction method
25 5.3.5 Loop method
27 5.3.6 Mid-section method
6 Site selection
6.1 General
28 6.2 Site-selection criteria
29 7 ADCP Deployment procedure
7.1 Deployment techniques
7.1.1 General
7.1.2 Manned boat mounted
7.1.3 Tethered boat
30 7.1.4 Deployment on a remote-control craft
7.1.5 Data retrieval modes
7.2 Operation of boat
7.2.1 Boat path
31 7.2.2 Boat speed
7.3 Field procedures
7.3.1 Pre-field procedures
7.3.2 Field setup
34 7.3.3 Reviewing ADCP data during measurement
7.3.4 Post measurement requirements
35 7.4 Ancillary equipment
7.5 Other consideration
7.5.1 Edge distances
7.5.2 Depth measurements at sites with high sediment concentrations
36 7.5.3 GNSS compass
7.6 Maintenance and ADCP checks
7.6.1 General
7.6.2 Built-in diagnostic check
7.6.3 Periodic major service in the manufacturer
7.6.4 Periodic ADCP performance check
7.6.5 Physical maintenance
7.6.6 Beam-alignment test
37 7.7 Training
8 Uncertainty
8.1 General
8.2 Definition of uncertainty
38 8.3 Uncertainties in ADCP measurements — General considerations
8.4 Sources of uncertainty
39 8.5 Minimizing uncertainties
40 Annex A (informative) Velocity distribution theory and the extrapolation of velocity profiles
42 Annex B (informative) Determination of edge discharges
44 Annex C (informative) Example of an equipment check list
46 Annex D (informative) Example of ADCP gauging field sheets
50 Annex E (informative) Beam alignment test
52 Annex F (informative) Uncertainty evaluation methods
53 Bibliography

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BS ISO 24578:2021
$198.66