High-frequency turbidity currents in British Columbia fjords |
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Authors: | Brian D Bornhold Ping Ren David B Prior |
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Institution: | (1) Pacific Geoscience Centre, Geological Survey of Canada, V8L 4B2 Sidney, British Columbia, Canada;(2) School of Earth and Ocean Sciences, University of Victoria, V8W 2Y2 Victoria, British Columbia, Canada;(3) Atlantic Geoscience Centre, Geological Survey of Canada, B2Y 4A2 Dartmouth, Nova Scotia, Canada;(4) Present address: GeoSea Consulting (Canada) Ltd., Fulford Harbour, V8K 1Z2 British Columbia, Canada |
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Abstract: | The frequency of turbidity currents in Bute Inlet and Knight Inlet (British Columbia, Canada) was monitored. A prototype instrument (turbidity event detector) was deployed adjacent to prominent incised sea-floor channels. Approximately 25–30 turbidity currents occur annually. They appear closely correlated to periods of higher river discharge into the heads of the fjords. Two peaks in both discharge and turbidity current fequency occur, one in response to snow melt in late June–early July, the other to glacier melt in August. Virtually no turbidity currents were observed in winter. River mouth bars, channel deposits, and other deltaic sediments build up during lower discharge periods and are swept onto the steep delta front and into subaqueous channels, along with bedload, during floods. |
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