Dispersion of broadband acoustic normal modes in the context of long range sediment tomography

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The long range sediment tomography technique exploits acoustic normal mode dispersion in shallow water. This paper discusses the effect of variations in sediment distribution-bo th spatial and depth-wise-on the resulting dispersion characteristics. Dispersion data from two locations collected as part of different field experiments are presented and compared. The modal dispersion at these locations-Middle Atlantic Bight and East China Sea-appears to be very different. Possible factors resulting in differences in dispersion behavior at these two locations are discussed based on the sediment information from historic data, core data, geophysical surveys and inversions. In the East China Sea the dispersion from two sides of a sediment boundary between two different types of sediments show different characteristics. Some factors which need to be considered in experimental design are also discussed. © 2006 Springer.

Publication Title

Acoustic Sensing Techniques for the Shallow Water Environment: Inversion Methods and Experiments