Imaging Active Mass-Wasting and Sediment Flows on a Fjord Delta, Squamish, British Columbia

Academic Article


  • In 2012, using multibeam water column imaging and a rapidly dipping towed optical backscatter probe, the evolution of a descending suspended sediment plume below the overlying river plume was monitored on an hourly basis. Towards low water, that descending plume was seen to occasionally feed a near seabed higher suspended sediment layer. On the development of this layer, the water column imaging revealed a thin basal flow that lasted about an hour and corresponded directly with the period of migration of the channel floor bedforms. Delta-lip failures are associated with the upslope end of about half of the bedform trains suggesting an alternate initiating mechanism.
  • Authors

  • Hughes Clarke, John
  • Clarke, John E Hughes
  • Marques, Carlos R Vidiera
  • Pratomo, Danar
  • Status

    Publication Date

  • 2014
  • Keywords

  • Bedform translation
  • Cyclic steps
  • Prodelta mass wasting
  • Surface differences
  • Turbidity current
  • Water column imaging
  • Digital Object Identifier (doi)

    Start Page

  • 249
  • End Page

  • 260
  • Volume

  • 37