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http://dx.doi.org/10.7776/ASK.2013.32.1.014

5-MHz Volume Backscattering Strength Measurements from Suspended Sediment Concentrations  

Lee, Changil (Department of Marine Sciences and Convergent Technology, Hanyang University)
Choi, Jee Woong (Department of Marine Sciences and Convergent Technology, Hanyang University)
Publication Information
The Journal of the Acoustical Society of Korea / v.32, no.1, 2013 , pp. 14-21 More about this Journal
Abstract
The erosion, suspension, and transport of sediment frequently occur in the coastal waters and estuarine. These processes often generate the so-called fluid mud layer, which is defined as a high-concentration aqueous suspension of fine grained sediment (> 10 g/l), consisting mainly of silt and clay-size particles. Therefore the high-resolution ultrasound is mostly used to detect or monitor the fluid mud layer. Because the sound attenuation tends to increase rapidly with the suspended sediment concentration, it is necessary to consider the accurate attenuation correction to estimate the backscattering strengths from the suspended sediment layers. In this paper, the volume backscattering strengths with various suspended sediment concentrations were measured using 5-MHz ultrasound signal in a small-scale water tank. The sound attenuation due to the viscosity and scattering from suspended sediment particles was predicted by the Richard's model and applied to the sonar equation to estimate the volume backscattering strengths from the suspended sediment concentrations. For the case that the additional attenuation was not considered, the volume backscattering strengths increased to the concentration of 20 g/l, and over this point, the backscattering strengths were roughly constant. However, for the case that the attenuation due to the suspended sediment concentration was considered, the backscattering strengths increased with the concentration.
Keywords
Suspended sediment concentration; Fluid mud; Volume backscattering strength; Attenuation coefficient;
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