我国东部沿海平均潮差分布特征及变化规律

我国沿海地区面积广阔,受多种因素的影响,平均潮差的分布及变化特征相当复杂。由此,利用我国东部沿海地区21个验潮站连续1 a的逐时实测潮位资料,统计其年平均潮差及月平均潮差,并由此分析了年平均潮差在我国东部沿海的分布特征及月平均潮差变化规律。结果显示我国东部沿海平均潮差的分布及变化除受天文因素的影响,径流以及海湾形态亦是重要的影响因素。沿海地区,在天文因子作用下,月平均潮差呈现明显的规律性变化,但在河口内及受非周期性因素影响严重海域,月平均潮差变化规律则比较复杂。

Distribution and variation law of mean tidal range in eastern coastal China

Influenced by multiple factors, distribution and variation law of the mean tidal range in easterncoastal China are quite complicated. Therefore, based on the continuous hourly observation data of 1 year at 21 tide gauges in eastern coastal China, annual mean tidal range and monthly mean tidal range are statistically analyzed.Furthermore, distribution of the annual mean tidal range and variation law of the monthly mean tidal range are also analyzed. The results show that besides the astronomical factor, runoff and morphology of the bay are important factors which can influence distribution and variation law of the mean tidal range. In the coastal area, influenced by the astronomical factor, monthly mean tidal range varies regularly. But in the river estuaries or the areas influenced by the acyclic factors, variation law of the monthly mean tidal range is irregular and complicated.