漳州东山湾附近海域潮汐特性分析

Analysis on tidal characteristics near the Dongshan Bay of Zhangzhou

基于漳州东山湾附近海域5个潮位观测站的四季实测数据,对该海域的潮汐性质、潮位特征值、理论最低潮面、平均海平面、余水位等进行了分析计算。结果表明:该海域兼具正规半日潮和不正规半日潮特性,各观测站的最大潮差分别为2.98 m、3.82 m、4.10 m、4.32 m、4.48 m,各站最高潮位、最低潮位等特征值的出现时刻基本一致,各站每季度平均涨潮历时皆大于平均落潮历时;各观测站每季度的月平均海平面变化趋势基本一致,各站的月平均海平面均为秋季最高,各站理论最低潮面值从西南沿岸向东北逐渐变大;该海域余水位呈现短周期波动,在空间上表现为各站余水位变化具有高度相关性,在时间上表现为春夏季以减水为主,秋季以增水为主,该海域余水位特性有利于实施基于余水位订正的潮位推算。

Based on the seasonal observation data from five tide stations near the Dongshan Bay of Zhangzhou,the tidal property,tidal level characteristics,theoretical lowest tidal level(TLT),mean sea level(MSL),and residual water level of this region are analyzed in this paper.The results show that:This area is characterized by the regular semidiurnal tide and irregular semidiurnal tide with the maximum tide range 2.98 m,3.82 m,4.10 m,4.32 m,and 4.48 m for each station.The typical characteristics such as high tidal level and the lowest tidal level are basically synchronous between stations,where mean duration of tidal rise is longer than the mean duration of tidal fall for each quarter;The trend of the monthly mean sea level of the stations is consistent for each quarter,where the monthly mean sea level reaches its maximum in autumn and the TLT gradually increases from the southwest coastal area to the northeast;The residual water level in this region exhibits short periodic fluctuations that are highly related to each other in space.In time,the residual water level predominantly decreases in spring and summer and increases in autumn.The characteristics of the residual water level in favor of tide level calculation based on the correction of residual water level.