Abstract
Acoustic measurements of sound speed and attenuation were made in a laboratory water tank containing water saturated granular medium consisting of six kinds of glass beads each with mean grain sizes of 0.090, 0.150, 0.354, 0.507, 0.625, and 0.875 mm for several frequencies extending from 40 kHz to 1 MHz. Cross‐correlation technique and time‐of‐flight technique are used to calculate the sound speed and attenuation of samples. In the presentation, the uncertainties of sediment preparation such as air‐removal, grain packing, and depth‐varying of sediment will be mainly discussed. Also, the observed patterns of the sound speed and attenuation will be presented for the mean grain size, grain size distribution, and frequency.
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