Marine Sediment Acoustic Physical Properties Nondestructive Determination And Correlation Analysis Research

The study on acoustic physical properties of marine sediment has important research significance in oceanography, marine geology and marine geophysics field. The relationship of marine sediment acoustic properties and physical properties, not only provide data basis for marine acoustic model, but also provided a reference basis for sediment geophysical acoustic parameters inversion of sediment physical properties, the inversion result provides data and reference value for ocean engineering construction, geological mapping and evaluation of marine environment. Therefore, accurately obtaining sediment acoustic physical properties and analyzing the interaction of them is very important.This paper makes use of Micro-CT scanner to marine sediment samples nondestructive scanning, According to the water, gas and solid particles in sediment samples for X ray absorption rate is different, extracting sediments parameters of water content, gas(bubble) content, solid content, porosity, saturation and pore ratio. Making use of intelligent nonmetal ultrasonic detector to sediment samples ultrasonic nondestructive determination. Through the mutual correlation analysis of ultrasonic signal, received sediments sound velocity. Using of signal spectrum analysis method, extracting the acoustic attenuation coefficient of sediment samples. Through to marine sediment samples acoustic physical property parameters regress analysis, the regress analysis result shows that double parameters of curved surface fitting is better than single parameter curve fitting, sound velocity and particle content is positive correlation, with water content and porosity is a negative relationship, especially gas content is obvious to effect on the sound velocity and acoustic attenuation. When the porosity was certain of the sample, the speed of sound is positive correlation with water saturation. Empirical formula of sediment acoustic physical properties can also provide a reference for multi parameter inversion for multi parameter inversion.