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http://dx.doi.org/10.7776/ASK.2014.33.1.001

Measurements of Ultrasound Attenuation Coefficient at Various Suspended Sediment Concentrations  

Lee, Changil (한양대학교 해양융합과학과 해양음향연구실)
Choi, Jee Woong (한양대학교 해양융합과학과 해양음향연구실)
Publication Information
The Journal of the Acoustical Society of Korea / v.33, no.1, 2014 , pp. 1-9 More about this Journal
Abstract
Coastal water including estuaries has distinctive environmental characteristics where sediments are transported and deposited by flowing river water, providing an environment in which fluid mud layers can be formed. Acoustic method is mostly used to detect or monitor the fluid mud layer. However, since sound propagating in this layer suffers severe attenuation, it is important to estimate the accurate attenuation coefficient for various concentrations of fluid mud layer for the successful use of the acoustic method. In this paper, measurement results of attenuation coefficient for 3.5, 5, and 7.5 MHz ultrasounds were presented. The measurements were made in a small-size water tank in which suspended sediment samples with various sediment concentrations were formed using kaolinite powder. The results were compared to the model predictions obtained by attenuation coefficient model in which the mean grain size (called as Mass-median-diameter, D50) was used as input parameter. There were reasonable agreements between measured attenuation coefficients and model outputs predicted using the particle range of D50 ${\pm}20%$. The comparison results imply that although the suspended sediments consist of various-sized particles, sound attenuation might be greatly influenced by amount of particle with a size which has a larger attenuation than that of any particle in the suspended sediments for the frequency used.
Keywords
Suspended sediment; Fluid mud; Ultrasound attenuation coefficient; Particle size distribution;
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