Experimental research of in situ acoustic properties measurement of seafloor unconsolidated sediment
海底松散沉积物声学性质原位测量实验研究

In this paper,we analyse the measurement method of compressional wave velocity and acoustic attenuation in unconsolidated seafloor sediment,and develope an in situ measurement system based on this analysis.Experiments in laboratory and sea beach are conducted separately.In this experiment,compressional wave velocity and attenuation coefficient are measured using this system.By analyzing the acoustic data acquired, we get conclusions that the grain sizes affect obviously the compressional velocity and attenuation coefficient,the increase of grain size will cause a high speed and a strong attenuation.The research in this paper can be used to develop the technology of in-situ measurement of seabottom sediment acoustic properties,which may develop the efficiency of the seabottom investigation greatly.