Research on Tidal Characteristics Based on the Tidal Level Se-quence of the Qinzhou Bay Tide Station from 2008 to 2020
Tide is the main marine dynamic in the Qinzhou Bay,which has significant impacts on material transport,marine engineering,and marine ecological environment.Based on the 13-year water level observa-tion data of Qinzhou Bay tide station from 2008 to 2020,by using the methods of tidal harmonic analysis,skewness calculation and linear regression,the long-term tidal variation,tidal asymmetry characteristics and sea level change trend in the Qinzhou Bay were analyzed.The results showed that the tides at the Qinzhou Bay tide station were dominated by O1 and K1tides,which were regular all-day tides.The main tidal ampli-tude had significant interannual variations,with the minimum value in 2008,O1 was 95.82 cm,K,was 88.18 cm,and M2 was 39.53 cm.In 2016,it reached the maximum value,O1 was 104.27 cm,K1 was 95.15 cm,and M2 was 46.16 cm.This change was related to the change of the declination angle of the moon.The tidal a-symmetry in the Qinzhou Bay was significant.The duration of flood tide was 2-3 h longer than that of ebb tide.The main reason for this phenomenon was the interaction between semi-diurnal and diurnal tides.The main contribution came from the interaction between O1,K1 and M2,accounting for 80.97％-83.51％of the total tidal skewness.The sea level of Qinzhou Bay had a rising trend year by year,and the average rising rate was about 0.96 cm/a,which was higher than the average rising rate of the coastal sea level of the South China Sea in the same period.The research results can provide scientific basis for disaster prevention and mitigation and port engineering construction in the Qinzhou Bay.
万方数据
维普
