黄河口附近海域潮流特征分析

Analysis of tidal current characteristics in the sea near the Yellow River Mouth

黄河口作为我国重要的河口区域,研究其潮流特征对河口海域工程建设及环境保护具有重要意义。本文利用黄河口大潮期6个站位25 h连续潮流观测结果,采用准调和分析及数据统计方法,研究了该区域观测期间的潮流特征:观测期间,各站流速流向差异性较大,平均涨潮流历时大于平均落潮流历时。调和分析结果可知,半日潮流为该区的潮流性质,并且多数的站为往复流,该区所受浅水分潮流的影响较低。0~3 cm/s为各观测站的主要余流流速区间,S—SSW向为余流主向;各站位的流速在垂向上基本呈现出逐渐减小的态势。

As an important estuarine region in China,the Yellow River Estuary plays an important role in estuarine engineering construction and environmental protection.In this paper,the tidal current characteristics around the Yellow River Estuary during the spring tide period were studied by means of quasi-harmonic analysis and data statistics.During the observation period,the velocity and direction of each station had a great difference,and the average duration of tidal surge was larger than that of ebb tide.The results of harmonic analysis showed that the tidal current was semi-diurnal.Most of the stations were dominated by re-flow,and the shallow water tidal current had little influence.The residual flow velocity at each station was observed to be within the range of o-3cm/s.The vertical residual flow velocity at each station basically followed the trend of gradually decreasing from surface to bottom,and the residual flow was dominated by S-SSW direction.