| Based on the synchronous hourly observational data from four stations within the Meizhou Bay region spanningfrom September 2023 to September 2024, the tidal harmonic analysis approach founded on the least-squaresprinciple and the cumulative frequency method were employed to conduct an analysis ofthe fundamentalcharacteristics, variation patterns, and navigable water-level features of the tides in Meizhou Bay. The findingsindicate that the tidal regimein the coastal region of Meizhou Bay is characterized by a regular semi-diurnal pattern. Among the monitoring stations, the "M" _"2" tidal constituent amplitude is the most pronounced, with anmeanamplitude of 234.0 cm. Notably, the amplitude at Huanggan Island Station is the least, measuring 227.9 cm, whereas the amplitude at Xiuyu Station is the largest, reaching241.5 cm. The amplitude of "M" _"2" tidal constituent amplitude increases from the bay entrance towards the interior of Meizhou Bay. Furthermore, the amplitude and phase lag of the "S" _"2" tidal constituent are considerably lessthan those of the "M" _"2" tidal constituent, and they similarlyescalate from the bay entranceto the interior of Meizhou Bay. The maximum average tidal range and the maximum potentialtidal range are both observed at Xiuyu Station, measuring502 cm and 903 cm respectively. The minimum average tidal range and the maximum potential tidal range are recorded at Huanggan Island Station, with values of474 cm and 857 cm respectively. The diurnal inequality of tidal height in the Meizhou Bay is not pronounced. The duration of the ebb tide is marginallylonger than that of the flood tide, and the disparitybetween the two does not exceed 30 minutes. The water levels corresponding to a 90% cumulative frequency for 1-hour tidal rise at Xiuyu Station, Guotou Station, Dongwu Station, and Huanggan Island Station are 578 cm, 573 cm, 569 cm, and 536 cm respectively. The water levels corresponding todifferent frequencies of tidal rise exhibit an increasingtrend from the bay entrance towards the inner region of the Meizhou Bay. The designed high water levels at Xiuyu Station, Guotou Station, Dongwu Station, and Huanggan Island Station are 729 cm, 722 cm, 711 cm, and 678 cm respectively. The designed high water-level in the Meizhou Bay decreases from the inner part to the bay mouth, and the decreasing trend gradually increases, possibly due to the convergence of tidal energy caused by the narrowing of the bay's topography. The designed low-water levels at Xiuyu Station, Guotou Station, Dongwu Station, and Huanggan Island Station are 77 cm, 83 cm, 89 cm, and 61 cm respectively. In the Meizhou Bay, the designed low-water level increases from the inner part to the middle part of the bay and decreases from the middle part to the bay entrance. |
