Abstract:

The long-term automotive observation of the tide has been carried out at the Great Wall Station in the Antarctica since 5 January 1987 with the Aanderaa tide gauge (Model WLR-5). The data covered 60 days and the 8000 groups of records were obtained. In this paper, the observation is described and the data analysed. The resultes are as follows. 1. The tide at the Great Wall Station is an irregular semidiurnal tide. Its daily inequality is quite remarkable, and mainly the inequality of the low tide. 2. During the observed period, the highest and the lowest water levels were respec-tivelly 4.222 m and 1.714 m, higher and lower than the mean water level by about 1 m and 1.5 m respectivelly. The variation range of the water level is 2.5 m. 3. During the observation time, the mean, the maximum and the possible maximum tidal ranges were 1.501 m, 2.242 m and 2.944 m, respectivelly. 4. The difference between the mean tropic high and low water intervals was about 8 hours, and high low water intervals was about 4 hours, which emerged inequality of the flood durations and of the ebb durations. The difference between the mean equinoctial high and low water intervals was about 6 hours, which displays the feature of a semi-diurnal tide.