六横岛液化天然气(LNG)码头前沿潮流特征分析

Analysis of front tidal current characteristics of LNG wharf in Liuheng island

采用潮流调和分析方法对2020年8月6日到2020年8月21日六横岛拟建LNG码头海域3个连续站的表、中、底海流数据进行调和分析,得到3个站点的O_(1)、K_(1)、M_(2)、S_(2)、M_(4)、MS_(4)共6个分潮的调和常数,并绘制了各层各分潮的潮流椭圆。结果表明:1)观测海域表层涨潮平均流速在33~58 cm/s,落潮平均流速在27~48 cm/s,流速方向大致集中在WNW~ESE向。2)该海域潮流为往复流,潮流性质以正规半日潮为主,且M2分潮占绝对优势。3)观测期间表层余流流速在8~17 cm/s,中层余流流速在8~21 cm/s,底层余流流速在7~20 cm/s,方向为WNW向。4)最大可能流速出现在落潮期间,表层可以达到149 cm/s、中层可达120 cm/s、底层可达93 cm/s。

The tidal current harmonic analysis method is used to analyze the surface, middle, and bottom current data at three continuous stations in the sea area of Liuheng island from August 6,2020 to August 21,2020. The harmonic constants of O_(1),K_(1),M_(2),S_(2),M_(4),MS_(4) of the three stations are obtained, and the tidal current ellipses of each layer are drawn. The results show that: 1)The average velocity of the surface rising tide is 33~58 cm/s, and the average velocity of the ebb tide is 27~48 cm/s. The velocity direction is mainly WNW~ESE. 2)The tidal current in the sea area is reciprocating. The nature of the tidal current is mainly regular semi-diurnal tide, and the M2 sub-tide has an absolute advantage. 3)During the observation period, the residual current velocity at the surface is 8~17 cm/s, the residual current velocity of the middle layer is 8~21 cm/s, and the residual current velocity at the bottom layer is between 7~20 cm/s. The direction is WNW. 4)The maximum possible velocity occurs during the ebb tide. The surface layer can reach 149 cm/s, the middle layer can reach 120 cm/s, and the bottom layer can reach 93 cm/s method.