Subaqueous morphology and slope processes in a fjord delta, Bella Coola, British Columbia

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Abstract

An analysis of the subaqueous morphology of the Bella Coola delta, British Columbia, based on fathometer profiles, seismic and sidescan sonar surveys, gravity cores, and bottom grabs, defines a proximal, sandy delta front and a distal silt–clay prodelta. The former extends 3 km offshore to water depths of 275 m; the latter, 3 – 15 km down fjord to a depth of 550 m. Large chutes, succeeded downslope by depositional zones, characterize the delta front. Deep-seated rotational slides occur in the proximal part of the prodelta, indicating that the delta front and prodelta consist of separate mass-movement systems.

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