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Victoria University Antarctic Research Expedition Science and Logistics Reports 1979-80: VUWAE 24

Tidal Measurements (BAS)

page 15

Tidal Measurements (BAS)

A tide gauge consisting of a line anchored to the sea floor and running over a pulley suspended above the sea ice (Fig. 6) was set up in the Science Hut adjacent to the rig. Tidal movements were recorded by taking off the movement through a pulley reduction system onto a chart recorder. Usable records were obtained for the periods 1 to 25 September inclusive and 1 to 24 November inclusive. Until 9 September a reduction of 13.6:1 was used, thereafter 10.1:1. The maximum tidal amplitude was 0.89 m. In addition to the main tidal variations with periods of about 24.20 and 12.20 hrs small cyclical movements with amplitudes of a few mm and periods of 5–50 sec occurred. These are attributed to attenuated ocean swell and were too small to be measured by the recorder.