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Techniques for Scaled Underwater Reverberation Measurements

One proposed method to detect the presence of spilled or leaked oil under the surface ice of frozen waters would rely on measuring the reverberation time of an impulsive acoustic source generated beneath that surface. Although intended for application to expansive environments such as rivers, lakes, and oceans, where deployment and subsequent recovery of equipment would make experimental testing economically difficult to perform, a low-cost, scaled experiment to study the efficacy of this method was conducted. In the design of the experiment, realistic modeling of a large underwater environment and the ability to accurately measure reverberation time within such an environment were of paramount concern. The required scaling, the dimensions of the experimental platform, and its adaptation to mimic a realistic environment are discussed. The design of an appropriate acoustic source along with practical matters such as growing the ice and injecting the oil under the ice are also discussed. Finally, experimental results are presented.