By Robert D. Stoll (auth.)
Sediment Acoustics describes the improvement of a mathematical version for use to foretell the propagation features of acoustic waves in marine sediments. The version relies at the classical conception of Maurice Biot. during the last twenty years, R.D. Stoll has released many technical papers masking quite a few phases of improvement and diverse purposes of Biot's idea. This paintings is summarized in a single reference quantity for the 1st time and offers sufficient introductory fabric in order that researchers and scholars could use the version with no large literature searches. Scientists operating within the parts of acoustical oceanography, marine seismology, and ocean engineering will locate this monograph necessary in predicting the wave pace and attenuation of seafloor sediments in accordance with the geology of a space and such measurable actual houses as porosity and geostatic rigidity. an easy, interactive laptop application is given as an reduction in calculating pace and attenuation, and a few examples from fresh box experiments are provided in order that the predictions of the version might be in comparison with the "ground truth."
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25 in terms of intergranular stresses o0"= 0ij+ p! and c o n s i d e r an isotropic loading of the array in a "drained, jacketed" test, we obtain the following t i o n s h i p s b e t w e e n the stiffness c o n s t a n t s of Eqs. those of Eq. 21, c~], and Bk, assuming pf = 0. 26) B9 C33 = 8 4 -- -~9 C44 = 85, The parameters B7, compressibility which the these constants, B8, and B9 are C66 -- B 6 strongly particles particles I, we are composed. need to Thus, consider a in order test assume a saturated, test.
6. higher The influence of this p a r a m e t e r frequencies and so experimental range are v e r y useful is most evident at the data from this frequency in choosing the best v a l u e for a. We will c o m p a r e curves of the type shown in this figure w i t h e x p e r i m e n t a l data in Chap. 5. In order to p r e d i c t where the p e r m e a b i l i t y the p-wave response is very low, it is n e c e s s a r y moduli K b and ~ as f r e q u e n c y - d e p e n d e n t d i r e c t l y on the basis of experimental some viscoelastic model.
This figure shows the r e f l e c t i o n coefficient at d i f f e r e n t angles of incidence for several d i f f e r e n t v a l u e s of the c o e f f i c i e n t of p e r m e a b i l i t y along with a curve for an "elastic" sediment. The r e f l e c t i o n c o e f f i c i e n t is the ratio of the a m p l i t u d e of the p o t e n t i a l for reflected waves d i v i d e d by the a m p l i t u d e of the p o t e n t i a l for the labeled w i t h the incident appropriate wave, Ar/Ai, coefficient and each curve of permeability.
Sediment Acoustics by Robert D. Stoll (auth.)