Experiments on single mode excitation in shallow water propagation

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The normal mode theory for shallow water propagation is used to develop a method permitting the excitation of a single mode by means of a vertical array of sources. The experiments were carried out in a laboratory tank, in a thin layer of water lying on a thick sand bed. Single mode excitation was performed by a vertical array of 15 piezoelectric transducers, whose gain and polarity depend on the mode to be excited. Single mode propagation between a source array and a receiving array is also examined. The receiving array can simultaneously resolve five modes. In these conditions crosstalk between mode and mode conversion can be studied.