Résumé
Le comportement acoustique des vases marines obéit aux lois de la thermodynamique des processus irréversibles linéaires. L'eau et la matrice vibrent comme un seul élément et il n'existe pas d'onde longitudinale de deuxième espèce. Il semble que ce ne soit que pour les floculats (porosité approximativement comprise entre 0.9 et 0.8) que les ondes transversales n'existent pas. La vitesse dépend de l'élasticité de la vase et l'atténuation de sa viscosité et, à un degré moindre, des réarrangements internes. Le coefficient d'atténuation est alors proportionnel à la fréquence élevée à une puissance variant entre 0 et 2. Toutes les formules sont comparées aux résultats expérimentaux publiés.
Summary
The acoustical behaviour of marine muds obeys to thermodynamics of linear irreversible processes laws. Water and solid particles move with the same amplitude and phase, and longitudinal wave of the second kind does not exist. It seems that rotational wave does not exist only in flocculates (porosity lying approximatirely between 0.9 and 0.8). The wave speed depends on mud elasticity and attenuation on mud viscosity and, secondarily, on internal rearrangements between particles. The attenuation coefficient is proportional to the frequency with exponant included between 0 and 2. The whole formulas are compared to experimental results, already published.
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Mizikos, JP. Propriétés acoustiques des vases marines. PAGEOPH 93, 100–115 (1972). https://doi.org/10.1007/BF00875226
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DOI: https://doi.org/10.1007/BF00875226