4 edition of Computation of mean velocity in open channels using acoustic velocity meters found in the catalog.
Computation of mean velocity in open channels using acoustic velocity meters
by U.S. Dept. of the Interior, U.S. Geological Survey, Branch of Information Services [distributor] in Tallahassee, Fla, Denver, CO
Written in English
|Statement||by Eduardo Patino and Darwin Ockerman|
|Series||U.S. Geological Survey open-file report -- 97-220|
|Contributions||Ockerman, Darwin J., Geological Survey (U.S.)|
|The Physical Object|
|Pagination||iv, 12 p.|
|Number of Pages||12|
The rate at which a sound wave travels through a medium. Unlike the physicist's definition of velocity as a vector, its usage in geophysics is as a property of a medium: distance divided by ty can be determined from laboratory measurements, acoustic logs, vertical seismic profiles or from velocity analysis of seismic data. It can vary vertically, laterally and azimuthally in. Area-Velocity Flow Measurement in Open Channels and Pipes Portable, Battery-powered This compact new meter operates on standard alkaline batteries for extended time periods to log level, velocity and water temperature in open channels, partially full sewer pipes and surcharged pipes without ume or weir. It is.
–Single Point, Surface Velocity Measurement does not yield velocity measurement representative of cross section –Dead band in ultrasonic level measurement –Required velocity profiling –Only read velocity at the surface! To ensure the accuracy of measurement, various configurations of ultrasonic paths, defined by the positions of ultrasonic transducers working in a pitch–catch mode, have been devised and commercialized for single-path and multi-path transit-time ultrasonic flow meters [1,2,3,4,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23].For an ideal flow velocity profile without any .
Laboratory and Field Evaluation of Acoustic Velocity Meters Tracy Vermeyen1, A.M. ASCE Abstract A study was conducted to evaluate the performance of 27 acoustic flowmeters used at Hoover, Davis, and Parker Dams on the lower Colorado River. Field surveys and laboratory testing were used to evaluate and enhance the performance of the chordal-path. Area velocity flow meters are the ideal solution for measuring flow in partially filled pipes and open channels. Greyline is a world leader in this application and there are many hundreds of Greyline Area Velocity Flow Meters measuring flow in Southern Africa. Greyline is a leader in all formats of water metering. How It Works.
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Computation of Mean Velocity in Open Channels Using Acoustic Velocity Meters By Eduardo Patino and Darwin Ockerman U.S. GEOLOGICAL SURVEY Open-File Report Cited by: 7. Get this from a library. Computation of mean velocity in open channels using acoustic velocity meters. [Eduardo Patino; Darwin Ockerman; Geological Survey (U.S.)].
Computation of mean velocity in open channels using acoustic velocity meters Open-File Report By: Eduardo Patino and D.J. Ockerman. ACCURACY OF ACOUSTIC VELOCITY METERING SYSTEMS FOR MEASUREMENT OF LOW VELOCITY IN OPEN CHANNELS By Antonius Laenen and R.E.
Curtis, Jr. ABSTRACT The accuracy of acoustic velocity meters depends on equipment limitations, the accuracy of acoustic-path length and angle determination, and the stability of the mean velocity to acoustic-path velocity Cited by: Knowing the geometry of the channel, the total discharge can be calculated as a function of the surface velocity measured in the current core  , but such computation is highly affected by.
Part 9: Application of in-situ Point Acoustic Doppler Velocity Meters for Determining Velocity in Open Channels 1 Scope and general Purpose The purpose of this document is to provide guidelines for recommended practice to ensure that the collected measured streamflow data are:.
analysis of open-channel velocity measurements collected with an acoustic doppler current profiler Article (PDF Available) January with Reads How we measure 'reads'.
Acoustic velocity meter (AVM) accuracy depends on equipment limitations, the accuracy of acoustic-path length and angle determination, and the stability of the mean velocity to acoustic-path velocity relation.
Equipment limitations depend on path length and angle, transducer frequency, timing oscillator frequency, and signal-detection scheme. The vertical distribution of streamwise velocity in turbulent open-channel flows is very complex. Three regions have been identified in the vertical flow field for steady uniform flow in smooth, wide, open channels: (a) the wall region [yh/≤ to, y is the distance above the.
in which nine area-velocity flow meters were evaluated against a known discharge to determine accuracy and t o document ease of use for the hardware and software.
Each of the nine meters was individually tested in three open channels including; a ft-wide trapezoidal, a 4-ft-wide rectangular and an in-diameter circular channel. In such cases, a properly sized H-flume (open channel flow) or Parshall flume may be used to measure open-channel flow.
Continue to Flow in Conduits. It is important to understand the concepts of steady and unsteady flow because the methods for estimating discharge in open channels for steady and unsteady flow are different. most typical configurations of the Acoustic Doppler meters to measure velocity in open channels (lateral, left); SonTek SL (bottom mount, right).
SonTek IQ 2. Limitations of the Stage – Discharge Curve The stage- discharge curve is a commonly used tool worldwide, to predict future flow conditions based on the water level (elevation).
Mean velocity in a vertical profile is approximately estimated by the velocity at depth in small depths. Mean velocity in a vertical profile is more properly determined by the average of the velocities at and depth.
The mean velocity in a vertical profile is 80–90% of the water surface velocity. Modern open-channel flow meters are available in several technologies (e.g., mechanical, electromagnetic, and acoustic).
These meters are the basic instrument used in the velocity-area method, which is the most common direct technique used to estimate the discharge of streams and channels.
FLOW IN OPEN CHANNELS As in the case of pipe flow, the earlier experimenters assumec the loss of head during steady flow in an open channel to be pro portional to the square of the velocity, and adopted one or other modification of the Chezy formula v=CV(mi), where in is the hydraulic mean depth (=cross-sectional area [Awetted perimeter [P]), and i is the gradient of the channel The.
National Industry Guidelines for hydrometric monitoring NI GL – Acoustic Doppler Velocity Meters. Page 9 of Definitions. For the purpose of this document, the definitions given in National Industry Guidelines for hydrometric monitoring, Part 0: Glossary, NI GL – apply. 2 Acoustic Doppler Velocity Meters.
The mean channel velocity can be determined by using a large number of paths. Unlike electromagnetic and Doppler methods, this technique provides a direct measure of mean velocity along the path. It therefore requires no calibration. The transit-time method has the potential to measure mean velocity measurements with an uncertainty order of 2%.
These relations allow the computation of continuous mean velocity and cross-sectional area and are used to compute continuous records of discharge at a station.
The development of cost-effective acoustic Doppler velocity meters (ADVMs) has increased the application of IVQ methods for computing discharge. An alternative method for measuring velocities in open-channel flows: perfomance evaluation of a Pitot tube compared to an acoustic meter INTRODUCTION Modern open-channel flow meters are available in several technologies (e.g., mechanical, electromagnetic, and acoustic).
These meters are the basic instrument used in the velocity-area method. D() Standard Test Method for Open-Channel Flow Measurement of Water by Velocity-Area Method open-channel flow~ cross-sectional area~ velocity-area method~ flow velocity~.
Area-Velocity Flow Measurement in Open Channels and Pipes Level-Velocity Logger Stingray Logs Level and Velocity for Flow Studies Includes powerful Windows software for Flow analysis and reporting This compact new meter operates on standard alkaline batteries for extended time periods to data log level, velocity and water temperature in.Uncertainty in open-channel discharges measured with the velocity-area method J.
Le Coz∗,a, B. Camenena, X. Peyrarda, G. Dramaisa aIrstea (Cemagref), UR HHLY, Hydrology-Hydraulics 3 bis quai Chauveau, CP F, Lyon Ce France Abstract A large part of the discharge measurements conducted in open-channels are performed using the.Flow velocity measurements using point-velocity meters are normally obtained by sampling one, two or three velocity points per vertical profile.
During high floods their use is inhibited due to the difficulty of sampling in lower portions of the flow area. Nevertheless, the application of standard methods allows estimation of a parameter, α, which depends on the energy slope and the Manning.