Tidal Currents in Juan de Fuca Strait

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Abstract
Three series of direct current observations taken in Juan de Fuca Strait in 1952 have been analysed. A linear relationship between the difference in sea level on the ocean coast and the Strait of Georgia and tidal currents has been shown. This relation holds from the surface to the lower depths. The current velocities in a cross-section can be predicted at any time. These sections show that the ocean water tends to intrude along the bottom on the flood, expanding upward and favouring the southern shore. The ebbing water is first noticed in the middle of the strait, then it expands down and across favouring the northern shore. The ebb current is stronger at the surface, and the flood current stronger near the bottom. Surface current predictions are shown to be comparable to the U.S. Coast and Geodetic Survey tidal predictions. From this it is reasonable to believe that the predicted tidal currents at the lower depths should also be valid.

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