Measuring Directional Velocity in Water Waves with an Acoustic Flowmeter PDF Download
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Author: R. H. Multer
Publisher:
ISBN:
Category : Hydraulic engineering
Languages : en
Pages : 40
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Author: R. H. Multer
Publisher:
ISBN:
Category : Hydraulic engineering
Languages : en
Pages : 40
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Book Description
Author: R. H. Multer
Publisher:
ISBN:
Category : Flow meters
Languages : en
Pages : 0
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Book Description
The report contains the technical details of an investigation which was undertaken to adapt an acoustical flowmeter to a device for measuring velocities in water-wave phenomena. The flowmeter studied was designed to measure the difference in travel times of two acoustical pulses traveling simultaneously in opposite directions along a common path. Because of viscous effects, a zone of low velocity flow occurs behind each probe and the measured velocity is somewhat less than the actual velocity when the angle between the acoustical path and velocity vector, theta, is small. (Author).
Author: Roger Harry Multer
Publisher:
ISBN:
Category : Water waves
Languages : en
Pages : 54
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Author:
Publisher:
ISBN:
Category : Beach erosion
Languages : en
Pages : 708
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Author: Coastal Engineering Research Center (U.S.)
Publisher:
ISBN:
Category : Beach erosion
Languages : en
Pages : 900
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Author: Stuart Humphrey Hoffard
Publisher:
ISBN:
Category : Acoustic velocity meters
Languages : en
Pages : 40
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Book Description
Tests were conducted in 1978 to determine the feasibility of using an acoustic velocity meter to measure the Sacramento-San Joaquin Delta outflow in the Chipps Island Channel, Suisun Bay, Calif. Three parts of transducers with frequencies of 100, 40, and 24 kilohertz were installed on a cross-channel test path and operated at three elevations, 15.5, 8.0, and 4.0 feet below mean lower low water, to test signal transmission at varying depths. Transmission was most reliable at the lowest depth, and the 24-kilohertz transducers at the 7-millivolt threshold of signal strength met the study 's criterion of no persistent signal loss of more than one hour 's duration in any phase of the tidal cycle. Signal strength was statistically correlated with the environmental factors of wind velocity, wind direction, solar insolation, electrical conductivity, water temperature, water velocity, stage, rate of change in stage, and the acceleration of the rate of change in stage. All correlations were weak. Signal strength is apparently a function of the interaction of several environmental factors. A 32-day test to observe if aquatic growth on the transducers would affect signal transmission showed no reduction in signal strength. Suspended-sediment samples indicated that both the size and concentration of particles are greater than presumed in earlier studies. According to the results of this study, chances are good for reliable transmission of acoustic velocity meter signals. Usually some signals were much stronger than the average 20-second signal strength at 15-minute intervals used for correlation and the frequency analysis. Superior equipment is now being developed specifically for the Chipps Island site to transmit signals several times stronger than the signals analyzed in these tests.
Author: David B. Duane
Publisher:
ISBN:
Category : Continental shelf
Languages : en
Pages : 432
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Author: Trimbak Mukund Parchure
Publisher:
ISBN:
Category : Flow meters
Languages : en
Pages : 168
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Author: Coastal Engineering Research Center (U.S.)
Publisher:
ISBN:
Category : Beach erosion
Languages : en
Pages : 38
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Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 1504
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