東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back to Search results for [ null ]

Switch To: Labeled | MARC Mode | ISBD

Improving acoustic Doppler velocity ...

Howes, Daniel Justin.

Linked to FindBook

Google Book

Amazon

博客來

Improving acoustic Doppler velocity meter accuracy for open channel discharge measurement.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Improving acoustic Doppler velocity meter accuracy for open channel discharge measurement./
Author:	Howes, Daniel Justin.
Description:	162 p.
Notes:	Source: Dissertation Abstracts International, Volume: 71-06, Section: B, page: 3818.
Contained By:	Dissertation Abstracts International71-06B.
Subject:	Engineering, Agricultural. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3404303
ISBN:	9781124011073

Improving acoustic Doppler velocity meter accuracy for open channel discharge measurement.
Howes, Daniel Justin.

Improving acoustic Doppler velocity meter accuracy for open channel discharge measurement. - 162 p.

Source: Dissertation Abstracts International, Volume: 71-06, Section: B, page: 3818.

Thesis (Ph.D.)--University of California, Irvine, 2010.

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.

ISBN: 9781124011073Subjects--Topical Terms:

1019504
Engineering, Agricultural.

Improving acoustic Doppler velocity meter accuracy for open channel discharge measurement.
LDR:03394nam 2200325 4500 001 1396261
005 20110603090743.5
008 130515s2010 ||||||||||||||||| ||eng d
020 $a 9781124011073
035 $a (UMI)AAI3404303
035 $a AAI3404303
040 $a UMI $c UMI
100 1 $a Howes, Daniel Justin. $3 1675029
245 1 0 $a Improving acoustic Doppler velocity meter accuracy for open channel discharge measurement.
300 $a 162 p.
500 $a Source: Dissertation Abstracts International, Volume: 71-06, Section: B, page: 3818.
500 $a Adviser: Brett F. Sanders.
502 $a Thesis (Ph.D.)--University of California, Irvine, 2010.
520 $a 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.
520 $a 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.
520 $a 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%.
590 $a School code: 0030.
650 4 $a Engineering, Agricultural. $3 1019504
650 4 $a Engineering, Civil. $3 783781
690 $a 0539
690 $a 0543
710 2 $a University of California, Irvine. $b Civil Engineering - Ph.D. $3 1672405
773 0 $t Dissertation Abstracts International $g 71-06B.
790 1 0 $a Sanders, Brett F., $e advisor
790 1 0 $a Rosso, Diego $e committee member
790 1 0 $a Grant, Stanley B. $e committee member
790 $a 0030
791 $a Ph.D.
792 $a 2010
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3404303