Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Improving Acoustic Doppler Velocity Meter Accuracy For Open Channel Discharge Measurement
Download Improving Acoustic Doppler Velocity Meter Accuracy For Open Channel Discharge Measurement full books in PDF, epub, and Kindle. Read online Improving Acoustic Doppler Velocity Meter Accuracy For Open Channel Discharge Measurement ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Improving Acoustic Doppler Velocity Meter Accuracy for Open Channel Discharge Measurement by : Daniel Justin Howes
Download or read book Improving Acoustic Doppler Velocity Meter Accuracy for Open Channel Discharge Measurement written by Daniel Justin Howes and published by . This book was released on 2010 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Acoustic Doppler velocity meters (ADVMs) provide an alternative to more traditional flow measurement devices and procedures such as flumes, weirs, and stage-rating for open channels. However, the requirements for correct calibration are extensive and complex. In this dissertation, two original independent projects were undertaken to accomplish a similar goal: to improve the accuracy of ADVM without the need for in situ calibration. For the first, a 3D computational fluid dynamics (CFD) model is used to design a subcritical rapidly varied flow (RVF) contraction that provides a consistent, linear relationship between the upward-looking ADVM sample velocity and the cross-sectional average velocity, in order to improve non-calibrated ADVM accuracy. CFD simulations validated the subcritical contraction in a rectangular and trapezoidal cross section by showing errors within +1.8% and -2.2%. Physical testing of the subcritical contraction coupled with an upward-looking ADVM in a large rectangular flume provides laboratory validation with measurement errors within +/-4% without calibration. In the second project, an algorithm is developed for real-time estimation of the cross-sectional average velocity of a channel flow using an upward-looking pulsed wave ADVM. The Velocity Contour Weighting Method (VCWM) is applicable to gradually varied flows in prismatic channels (without the RVF contraction). VCWM estimates the average velocity as a weighted average of ADVM bin velocities. Weights are based partly on the flow geometry and partly on the velocity distribution sampled by the ADVM. Collectively, these two factors enable the VCWM to adapt to a relatively wide range of channel geometry and roughness features which fall within the range of those used to develop the algorithm. Expressions for the velocity weights are devised by first applying a validated 3D computation fluid dynamics (CFD) channel flow model to a wide range of flow scenarios including differing channel geometries, discharge rates, depths, and boundary roughness, which is then reduced empirically with the aid of dimensional analysis to obtain velocity weight equations. Application of the method to a large rectangular flume and field testing in trapezoidal irrigation canals shows that the VCWM predicts the average velocity with an error less than +/-5.5%.
Book Synopsis Measuring Discharge with Acoustic Doppler Current Profilers from a Moving Boat by : David S. Mueller
Download or read book Measuring Discharge with Acoustic Doppler Current Profilers from a Moving Boat written by David S. Mueller and published by CreateSpace. This book was released on 2014-06-16 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mission of the U.S. Geological Survey (USGS) Water Resources Discipline is to provide the information and understanding needed for wise management of the Nation's water resources. Inherent in this mission is the responsibility of collecting data that accurately describe the physical, chemical, and biological attributes of water systems. These data are used for environmental and resource assessments by the USGS, other government agencies and scientific organizations, and the general public. Reliable and quality-assured data are essential to the credibility and impartiality of the water-resources appraisals carried out by the USGS.
Book Synopsis Accuracy of Acoustic Velocity Metering Systems for Measurement of Low Velocity in Open Channels by : Antonius Laenen
Download or read book Accuracy of Acoustic Velocity Metering Systems for Measurement of Low Velocity in Open Channels written by Antonius Laenen and published by . This book was released on 1989 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Discharge and Velocity Measurements by : Andreas Mueller
Download or read book Discharge and Velocity Measurements written by Andreas Mueller and published by CRC Press. This book was released on 2021-05-30 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers of the short course on Discharge and Velocity Measurements, Zurich, Aug. 1987 on discharge measurement and calibration, point measures of velocity, measurement of velocity fields, and needed developments.
Book Synopsis Feasibility of Acoustic Doppler Velocity Meters for the Production of Discharge Records from U.S. Geological Survey Streamflow-gaging Stations by : Scott E. Morlock
Download or read book Feasibility of Acoustic Doppler Velocity Meters for the Production of Discharge Records from U.S. Geological Survey Streamflow-gaging Stations written by Scott E. Morlock and published by . This book was released on 2002 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Discharge measurements at gaging stations by : D. Phil Turnipseed
Download or read book Discharge measurements at gaging stations written by D. Phil Turnipseed and published by . This book was released on 2010 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Preliminary Determination of Epicenters by :
Download or read book Preliminary Determination of Epicenters written by and published by . This book was released on 2006 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computation of Mean Velocity in Open Channels Using Acoustic Velocity Meters by : Eduardo Patino
Download or read book Computation of Mean Velocity in Open Channels Using Acoustic Velocity Meters written by Eduardo Patino and published by . This book was released on 1997 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Streamflow Measurement by : Reginald W. Herschy
Download or read book Streamflow Measurement written by Reginald W. Herschy and published by CRC Press. This book was released on 2008-06-30 with total page 535 pages. Available in PDF, EPUB and Kindle. Book excerpt: Too little water or too much'? In either case streamflow measurement is crucial. Climate change could significant affect water resources and flood management. Streamflow measurement is necessary for efficient water management.This third edition deals with all the main current methods for measuring the flow in rivers and open channels, in accordanc
Download or read book Water Measurement Manual written by and published by . This book was released on 2001 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Acoustic Doppler Current Profiler Measurements of River Discharge by : Scott E. Morlock
Download or read book Evaluation of Acoustic Doppler Current Profiler Measurements of River Discharge written by Scott E. Morlock and published by . This book was released on 1996 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Issues in Land and Water Engineering: 2011 Edition by :
Download or read book Issues in Land and Water Engineering: 2011 Edition written by and published by ScholarlyEditions. This book was released on 2012-01-09 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues in Land and Water Engineering / 2011 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Land and Water Engineering. The editors have built Issues in Land and Water Engineering: 2011 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Land and Water Engineering in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Land and Water Engineering: 2011 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Book Synopsis Pulsed Ultrasonic Doppler Velocimetry for Measurement of Velocity Profiles in Small Channels and Capplilaries by : Matthias Messer
Download or read book Pulsed Ultrasonic Doppler Velocimetry for Measurement of Velocity Profiles in Small Channels and Capplilaries written by Matthias Messer and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Pulsed ultrasound Doppler velocimetry proved to be capable of measuring velocities accurately (relative error less than 0.5 percent). In this research, the limitations of the method are investigated when measuring: in channels with a small thickness compared to the transducer diameter, at low velocities and in the presence of a flow reversal area. A review of the fundamentals of pulsed ultrasound Doppler velocimetry reveals that the accuracy of the measured velocity field mainly depends on the shape of the acoustic beam through the flow field and the intensity of the echo from the incident particles where the velocity is being measured. The ultrasonic transducer turned out to be most critical component of the system. Fundamental limitations of the method are identified. With ultrasonic beam measurements, the beam shape and echo intensity is further investigated. In general, the shape of the ultrasonic beam varies depending on the frequency and diameter of the emitter as well as the characteristics of the acoustic interface that the beam encounters. Moreover, the most promising transducer to measure velocity profiles in small channels is identified. Since the application of pulsed ultrasound Doppler velocimetry often involves the propagation of the ultrasonic burst through Plexiglas, the effect of Plexiglas walls on the measured velocity profile is analyzed and quantified in detail. The transducers ringing effect and the saturation region caused by highly absorbing acoustic interfaces are identified as limitations of the method. By comparing measurement results in the small rectangular channel to numerically calculated results, further limitations of the method are identified. It was not possible to determine velocities correctly throughout the whole channel at low flow rates, in small geometries and in the flow separation region. A discrepancy between the maximum measured velocity, velocity profile perturbations and incorrect velocity determination at the far channel wall were main shortcomings. Measurement results are improved by changes in the Doppler angle, the flow rate and the particle concentration. Suggestions to enhance the measurement system, especially its spatial resolution, and to further investigate acoustic wave interactions are made.
Book Synopsis Flow Measurement in Open Channels and Closed Conduits by : Lafayette K. Irwin
Download or read book Flow Measurement in Open Channels and Closed Conduits written by Lafayette K. Irwin and published by . This book was released on 1977 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measuring Discharge with Acoustic Doppler Current Profilers from a Moving Boat by : David S. Mueller
Download or read book Measuring Discharge with Acoustic Doppler Current Profilers from a Moving Boat written by David S. Mueller and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of acoustic Doppler current profilers (ADCPs) from a moving boat is now a commonly used method for measuring streamflow. The technology and methods for making ADCP-based discharge measurements are different from the technology and methods used to make traditional discharge measurements with mechanical meters. Although the ADCP is a valuable tool for measuring streamflow, it is only accurate when used with appropriate techniques. This report presents guidance on the use of ADCPs for measuring streamflow; this guidance is based on the experience of U.S. Geological Survey employees and published reports, papers, and memorandums of the U.S. Geological Survey. The guidance is presented in a logical progression, from predeployment planning, to field-data collection, and finally to post-processing of the collected data. Acoustic Doppler technology and the instruments currently (2008) available also are discussed to highlight the advantages and limitations of the technology. More in-depth, technical explanations of how an ADCP measures streamflow and what to do when measuring in moving-bed conditions are presented in the appendixes. ADCP users need to know the proper procedures for measuring discharge from a moving boat and why those procedures are required, so that when the user encounters unusual field conditions, the procedures can be adapted without sacrificing the accuracy of the streamflow-measurement data.
Book Synopsis Flow Measurement in Open Channels and Closed Conduits by :
Download or read book Flow Measurement in Open Channels and Closed Conduits written by and published by . This book was released on 1977 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Selected Water Resources Abstracts by :
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1990 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
