Generation of Lee Waves Over the Sill in Knight Inlet
It is now well known that tidally induced flow of stratified water over bottom irregularities can generate trains of internal waves whose envelope is of tidal frequency but which contain significant higher frequency components (Lee, 1972, Bell, 1975). Moreover, the existence of wave trains that might have been generated in this way has been demonstrated both by satellite imagery and direct observation in several places; recent examples include Massachusetts Bay (Haury, Briscoe and Orr, 1979) and the Andaman Sea (Osborne, Burch and Gordon, 1978). Nevertheless detailed measurements in the area of generation have been largely lacking. We describe here some observations of tidally induced flow over a sill in Knight Inlet, B.C. and identify certain similarities between these observations and recent laboratory experiments. The study of such flows is of value not only from the point of view of providing a better understanding of fjord circulation, but also because it provides a geophysical example of phenomena that are of basic fluid mechanical interest.
KeywordsShear Layer Internal Wave Separation Point Hydraulic Jump Internal Solitary Wave
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