The Tidal Jet in Rupert-Holberg Inlet
Located at the northern end of Vancouver Island, Rupert and Holberg Inlets are part of the Quatsino Sound Group (figure 1). Together these two inlets form one basin (44 km in length and 170 a maximum depth) which is connected to Quatsino Sound by Quatsino Narrows, a long (4 km), slender (0.4 km) and shallow (25 to 30 m) channel. It was evident from the investigations of Drinkwater and Osborn (1975), Stucchi and Farmer (1976), and from the earlier observations of Pickard (1963) that there was intense mixing occurring in this fjord. The remarkable uniformity of water properties, high dissolved oxygen levels in the deep waters and the large and rapid temporal changes in the deep water properties were evidence that strong mixing was occurring. Drinkwater and Osborn (1975) identified the strong tidal flow through Quatsino Narrows and into Rupert Holberg Inlet as the process responsible for the intense mixing. Based on observations obtained in the strong tidal flow - tidal jet - between Hankin Pt. and the northern end of Quatsino Narrows, Stucchi and Farmer (1976) proposed a qualitative model of the exchange process in this fjord. A more extensive series of observations of the tidal jet was obtained in August and September 1975 in order to better understand the nature and dynamics of the tidal jet.
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