New Theoretical Basis for Determining the Geoacoustic Parameters of the Seabed

摘要: Unconsolidated marine sediments are known to support compressional and rotational (shear) waves. Experimental observations reported in the literature indicate following: wave speeds show very weak, logarithmic frequency dispersion; attenuations closely proportional frequency, f; both increase with increasing mean grain size. A new theoretical approach propagation unconsolidated is described, which consistent these experimental observations. The basis of theory internal stress relaxation arising from microscopic sliding mineral grains against one another during passage a wave. From theory, correlations between properties (speeds attenuations) material (porosity, density, size) derived. These correlations, form simple algebraic expressions, may be used as an inversion technique for determining geoacoustic parameters sediment.