An analysis of the subaqueous morphology of the BeHa Coola delta, BHatish Columbia, based on fathometer profiles, seismic and sidescan sonar surveys, gmvity copes, and bottom grabs, defines a proximal, sandy delta front and a distal siltclay pmdelta. The former extends 3 lam offshore to water depths of 275 m; the latter, 3 -15 km down fjord to a depth of 550 m. Large chutes, succeeded dowanslope 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 sepamte mass-movement systems. Une Cmde de la moqhologie sous-aquatique du delta de Bella Coola, Colombie-Britanwique, fondCe sur des profils tracks par 6chosondeur9 relevts sismiques, sonars latkmux, densit6 de camttes et d9&hantillons prfilev6s au hasad, dkfinit un fmnt delta7que form6 de sable proximal et un prodelta compost de limonargile distal. Le delta se prolonge jusqu'h 3 km au hrge et la tranche d'eau atteint 275 m; le pmdelta s9Ctend de 3 2 15 en am% du fi'aordjjusqu98 uwe profondeur de 550 rn. Le front du delta est camct6ris6 par d'impomntes chutes qui faisaient place le long de la pentc B des zones de dCp8ts Be skdiments. Des Pnnted in Caenadu i Hrrrpnmk au Canada Can. J. Earth Sci. Downloaded from www.nrcresearchpress.com by McMaster University on 12/01/14For personal use only.
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