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水东湾潮流特征分析及三维数值模拟
冯少金
0
(广东海洋大学数学与计算机学院,广东 湛江 524088)
摘要:
基于水东湾海域利用现状及水环境综合整治工作的迫切需要,对其海洋水文要素开展野外调查,以清晰理解其潮流特征,并据此进行潮流三维数值模拟.调查结果显示,水东湾观测期间的实测潮差在2.6~2.9 m之间,平均潮差约2.8 m,湾口潮差最大,湾顶海域潮差最小,涨潮历时略长于落潮,属不正规半日潮;各观测站位的最大流速相差较大,最高值出现在湾口深槽,为134 cm/s,最低值出现在湾顶浅海海域,为31 cm/s,最大流速水平分布基本上呈现为从湾口向湾顶递减态势.模拟结果显示,水东湾内潮流基本沿潮汐通道呈往复流动,涨潮流向介于280°~300°之间,流速在0.28~1.36m/s范围内变化;落潮流向介于128°~180°之间,流速在0.56~1.44 m/s范围内变化,流矢受地形限制显著.
关键词:  海洋水文学  FVCOM  数值模拟  潮流  潮汐  水东湾
DOI:
基金项目:广东省高等教育“创新强校工程”资助项目(2015KQNCX051)
Tidal current analysis and three-dimensional numerical simulation in Shuidong Bay
FENG Shao-jin
(Faculty of Mathematics and Computer Science, Guangdong Ocean University, Zhanjiang 504088, China)
Abstract:
In view of the status quo for comprehensive improvement of the Shuidong Bay water environment, the field investigation of hydrological elements is carried out to understand the characteristics of tidal current with three-dimensional numerical simulation. The result shows that the measured tidal range is between 2.6~2.9m, the average tidal range is about 2.8m. The tidal range of bay mouth is the highest and it is the lowest around the top of the bay. The flooding time is slightly longer than the ebb tides and it is the irregular semidiurnal tide. The maximum flow velocity of each observation stations varies widely. While the highest value 134cm/s is in the deep trough, the lowest value 31cm/s is in shallow sea area. Basically the distribution of the maximum flow velocity in horizontal direction is descending from the mouth to the top of bay. The simulation results show that the tidal current of Shuidong Bay is reciprocating flow along the tidal channel. The flood current between 280°~300°, current velocity changes within 0.28~1.36m/s. And the ebb flow between 128°~180°, current velocity changes within 0.56~1.44m/s. Flow vector is affected significantly by topography.
Key words:  marine hydrography  FVCOM  numerical simulation  tidal current  tide  Shuidong Bay

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