Calibration and sediment load algorithms for an acoustic sediment flux probe
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Authors
Anderson, Weston J.
Subjects
NA
Advisors
Stanton, Timothy P.
Date of Issue
1994-06
Date
June, 1994
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
A method to infer sediment concentrations from acoustic backscatter levels has been implemented for a prototype acoustic sediment flux probe. This required calibrations of the acoustic transceiver systems and direct measurements of the system response to typical sediment size distributions over a wide range of concentrations. The sensitivities of the 1.3 MHz and 5.2 MHz transducers of an acoustic sediment probe were measured using the backscatter amplitudes from stainless steel wires of four different radii. A two-frequency inversion algorithm estimating the geometric mean radius and variance about the mean of suspended sediment with an assumed lognormal size distribution and the sediment mass concentration was developed and tested in a laboratory setting. The sensitivity of the 5.2 MHz transducer for each wire was consistent within 10%. The sensitivity of the 1.3 MHz transducer calculated for each wire was not consistent and is believed to be due to a strong angular dependence between the wire orientation and the 1.3 MHz transducer face. The sensitivities of each of the four transducers were, however, inferred from the system's response to the controlled sediment backscatter measurements.
Type
Thesis
Description
Series/Report No
Department
Meteorology
Physical Oceanography
Organization
NA
Identifiers
NPS Report Number
Sponsors
Funder
NA
Format
90 p.;28 cm.
Citation
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.