Date of Award
Master of Science in Ocean Engineering
Lester R. LeBlanc
A laboratory experiment was conducted to measure the acoustic properties of a hypothetical oilspill under arctic ice at Prudhoe Bay, Alaska. Artificial sea ice vas frozen from 35 0/00 sea water, Oil vas then injected beneathe it, and a transducer was placed in the oil with its principal axis normal to the plane of the ice. Signal strength from a single reflected pulse and transition time were measured as the transducer was moved, in steps, closer to the ice. The attenuations and sound velocity were obtained using dt/dx and dP/dx relationships. The reflection coefficients of the oil/ice interface were then calculated using the measured attenuations and the sound velocity. The sound velocity was determined to be 446.4 m/sec. The attenuations were -1.49, -2.51, and -3.08 nepers/m for 50, 100, and 200 kHz respectively, and the corresponding reflection coefficients were 0.079, 0.029, and 0.023.
Davis, William T., "An Experimental Determination of the Reflection Coefficient of a Crude Oil/Sea Ice Interface for Sound in the Kilohertz Range" (1982). Open Access Master's Theses. Paper 2106.