Seabed sediment acoustic attenuation in shallow seas of the South China Sea

Seabed sediment acoustic attenuation properties in shallow seas of the South China Sea were reported,a new way to measure and calculate the seabed sediment acoustic attenuation was presented,the results from two different frequencies were analyzed and the relation among several physical parameters of seabed sediment was discussed.Results show that the acoustic attenuation at the high frequency is much higher than that at the low frequency in the same type sediment;the acoustic attenuation of coarse granule sediment is higher than that of fine-particle sediment at the same measuring frequency.The acoustic attenuation is respectively 80~150/150~360 dB/m at low/high frequencies in the shallow sea seabed sediment of the Beibu Gulf and in the shallow sea seabed sediment of the southern H ainan Province,and the attenuation result is respectively 66~160/190~350 dB/m at low/high measuring frequencies.Comparing results with data from acoustic attenuation measurement of surface sediments in the northern Taiwan Strait,the data at the high frequency approach to it,but other data at the low frequency have much difference from it.