The study on three-dimensional numerical model and fronts of the Jiulong Estuary and the Xiamen Bay

Applying the methods of on-site observation and dynamic model, the research on the fronts at the Jiulong Estuary has been carried out, during which spatial and temporal distribution, dynamic characteristics and formation mechanism of salinity fronts are analyzed and discussed. The research shows that the estuarine fronts mainly lie in the area from the Jiyu Islet to the Haimen Island, outside of Yuweizai to Hulishan cross-section, the near coast of Yuweizai and the south of the Songyu-Gulangyu Channel. The fronts in the former two regions are formed directly by plume, while the one near the coast of Yuweizai is a tidal intrusion front caused by flood current and the one at the south of the Songyu-Gulangyu Channel is the result of current shear transformation. Under normal circumstances, fresh water of the Jiulong River mainly influences the inside of the Xiamen Bay, and when it is in typhoon seasons, plume front can affect the Taiwan Strait and has an effect on the biogeochemical Drocesses in the strait.

高集海堤开口后厦门湾潮流特征分析

为分析厦门海域生态修复工程高集海堤开口后厦门湾的潮汐动力特征,在厦门湾重要特征位置布设6个潮位站、3个海流站,选取2016年5月的潮位及海流数据进行分析,研究现状下厦门湾的潮流特征。分析表明:高集海堤开口后,厦门湾仍为正规半日潮区,东、西海域实现贯通,东海域涨潮流延伸进入西海域,东、西海域两股潮波在高集海堤西南侧汇合,潮差从湾口向湾顶递增,在高集海堤西南侧达到最大,湾顶平均潮差为442cm。位于东、西海域口门断面潮流呈往复流,东海域最大流速为84.6cm/s,西海域最大流速为115.6cm/s。由于地形的影响,海堤开口处的潮流为旋转流性质,附近最大流速可达143.0cm/s。