Abstract
In order to relate the levelling zeros of England and France, an analysis is made of the differences in mean sea level across the English Channel due to the dynamics of water movement, and applied to a 723-day period of tidal and other data recorded between Ramsgate and Dunkerque during 1957 and 1958. The principal factor affecting the transverse slope of the surface is found to be the Coriolis stress due to the effect of the earth’s rotation on the longitudinal currents, as expected. The mean longitudinal currents were estimated from the electrical potential across a submarine cable across the Dover Strait (Faraday effect), but the associated slopes were found to be less than would be expected from the assumption of a uniform current across the section. The concentration of current in the deeper parts of the channel and the mean effect of bottom friction probably account for this. The respective levelling zeros are found to differ by 19.6 cm with standard error 1.5 cm. A less reliable estimate of 25 cm with standard error 3 cm is deduced from 2 months’ records from Shoreham and Dieppe during 1953.
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