Abstract
Shallow coastal waters are characterized by high levels of suspended sediment particles relative to the open ocean. This kind of seawater is also characterized as turbid seawater. An experimental investigation on volume reverberation has been done in the sea area outside the Yangtze River Estuary, where the seawater contains a lot of suspended sediment particles. Sound scattering data at 8 sites in the frequency range from 10 to 40 kHz, in steps of 1 kHz, has been obtained. The results demonstrate that volume backscattering intensity in turbid seawater may be expected to fall in the range from ‐60 to ‐100 dB re m−1. Because sound absorption caused by suspended sediment particles in turbid seawater is much greater than that in clear seawater, the volume backscattering intensity does not change with the pulse length of the transmitted signal, even when the pulse length is less than 0.5 ms. Salinity in the sea area has little effect on volume backscattering intensity. However, suspended sediment particles may have a great effect on it. Therefore, if the concentration of suspended sediment particles changes from 31 mg/L to 47 mg/L, the volume backscattering intensity may be changed by 30 dB.
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