China Ocean Engineering

, Volume 31, Issue 1, pp 103–113 | Cite as

Study on sound-speed dispersion in a sandy sediment at frequency ranges of 0.5–3 kHz and 90–170 kHz

  • Sheng-qi Yu
  • Bao-hua Liu
  • Kai-ben Yu
  • Guang-ming Kan
  • Zhi-guo Yang
Technical Notes


In order to study the properties of sound-speed dispersion in a sandy sediment, the sound speed was measured both at high frequency (90–170 kHz) and low frequency (0.5–3 kHz) in laboratory environments. At high frequency, a sampling measurement was conducted with boiled and uncooked sand samples collected from the bottom of a large water tank. The sound speed was directly obtained through transmission measurement using single source and single hydrophone. At low frequency, an in situ measurement was conducted in the water tank, where the sandy sediment had been homogeneously paved at the bottom for a long time. The sound speed was indirectly inverted according to the traveling time of signals received by three buried hydrophones in the sandy sediment and the geometry in experiment. The results show that the mean sound speed is approximate 1710–1713 m/s with a weak positive gradient in the sand sample after being boiled (as a method to eliminate bubbles as much as possible) at high frequency, which agrees well with the predictions of Biot theory, the effective density fluid model (EDFM) and Buckingham’s theory. However, the sound speed in the uncooked sandy sediment obviously decreases (about 80%) both at high frequency and low frequency due to plenty of bubbles in existence. And the sound-speed dispersion performs a weak negative gradient at high frequency. Finally, a water-unsaturated Biot model is presented for trying to explain the decrease of sound speed in the sandy sediment with plenty of bubbles.

Key words

acoustic properties of sediment sound-speed dispersion sandy sediment bubbles 


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Copyright information

© Chinese Ocean Engineering Society and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Sheng-qi Yu
    • 1
  • Bao-hua Liu
    • 1
    • 3
  • Kai-ben Yu
    • 1
  • Guang-ming Kan
    • 2
    • 3
  • Zhi-guo Yang
    • 1
  1. 1.National Deep Sea CenterState Oceanic AdministrationQingdaoChina
  2. 2.Key Laboratory of Marine Sedimentology and Environmental GeologyFirst Institute of OceanographyQingdaoChina
  3. 3.Laboratory for Marine GeologyQingdao National Laboratory for Marine Science and TechnologyQingdaoChina

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