An analysis of summer tidal characteristics in Qinhuangdao sea area based on the observed data fromseabed based platform
WANG Xinyu
XU Guangpeng
Abstract：Based on the continuous observation data obtained by the seabed foundation in the field,this paper systematically analyzed the tidal characteristics of the Qinhuangdao sea area in the summer of 2017.The results showed that the diurnal tides(K1 and O1)dominated the sea area and the K1 tide was the most significant,with average amplitude of 0.28 m.The semidiurnal tides(M2 and S2)had smaller amplitudes,and the M4 tide was more obvious in the shallow water tide.In terms of spatial distribu-tion,except for the small variation of O1 tide,the fluctuation range of other tides was large.The influ-ence of semi-diurnal tide was increasing from north to south,and the amplitude increased by about 4 to 5 times when the tide wave propagated to the south of the sea area.The tidal type was all-day tide,which was affected by the M2 tide.The northern part of the sea area was a regular diurnal tide and the southern part was an irregular diurnal tide.The tidal range was small,and the average tidal range of the three stations was less than 0.5 m.The D1 station in the north of the sea area was close to the non-tidal point,and the average tidal range was close to 0.The maximum possible tidal range was about 2 m,indicating that the sea area was a weak tidal zone.The duration of the flood and ebb tides varied greatly,and the flood tide was dominant on the whole.The neap tide period had certain particularity,and the duration of the rising and ebb tides was different from the overall characteristics.
Keywords：seabed-baseharmonic analysistidal rangeflood tideQinhuangdao sea area
Publication Date：2025-12-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：8( 39-46 )