UNDERWATER ICE CRACKING NOISE MEASUREMENTS IN YELLOWKNIFE BAY, GREAT SLAVE LAKE, NEAR THE DETAH ICE ROAD

摘要

An opportunity arose on April 14, 2013 to go out on to the frozen ice road on Great Slave Lake, Northwest Territories, and attempt to measure the underwater ambient noise in Yellowknife Bay. Figure 1 shows the outline of Yellowknife Bay with the dotted line being a GPS track along the ice road. The '+' symbol denotes the location of the recording system, which was just beside the ice road. During the recording, the conditions were -12C, 6 kmh wind, the ice was 128 cm thick with a hard 20-cm snow cover, the water depth was 25 m with the hydrophone at 22 m depth, and the sun had risen 2.7 hr earlier, but was very low in the sky. The sun is estimated to be between 7 and 10 degrees above the horizon during the measurements.