Titlebook: Experimental Acoustic Inversion Methods for Exploration of the Shallow Water Environment; A. Caiti,J.-P. Hermand,M. B. Porter Book 2000 Sp

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New Theoretical Basis for Determining the Geoacoustic Parameters of the Seabed,indicate the following: the wave speeds show very weak, logarithmic frequency dispersion; the attenuations are closely proportional to frequency, f; and both wave speeds increase with increasing mean grain size. A new theoretical approach to wave propagation in unconsolidated sediments is described,

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Application of Geo-Acoustic Inversion Techniques to Subsurface Imaging of Seismic Near Field Scenardisposal sites, former military or industrial regions up to 50 m depth. Using seismic methods becomes more and more popular in this part of environmental protection. In near-surface seismics the elastic wavefield is excited by a seismic source, e.g. a falling weight or a sledge hammer acting on a me

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Lih-Rong Wang,Michael P. H. Liu few oceanographic modes. We also used the echo-pattern to track the source over a period of several days. During this period the isotherms in the ocean wavered by 20 m as a result of the tides, providing a challenge for model-based tracking. We will discuss these acoustic results with emphasis on the source tracking.

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ical processes in shallow water environments. Toreview the state of the art, an international workshop was held atCarvoeiro, Portugal, in March 1999, bringing together leadinginternational researchers in the field. In contrast to much of therecent theoretical work, emphasis was placed on the .experi

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