Abstract
Sediment mass transport from the Squamish River delta into the adjacent fjord (Howe Sound, British Columbia) is dominated by discrete turbidity current events which have incised semi-permanent channels on the delta front and out onto the prodelta. Acoustic data were collected in the spring of 2013, including both active and passive systems. Data from the active sonars are used to determine flow speed, flow thickness and suspended sediment concentration. The noise generated by these discrete turbidity currents is broadband (10 to 200 kHz) and, based on the sediment grain size and flow speeds, is shown to be due to sediment-generated noise, most likely at the base of the flows.
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