摘要
基于FVCOM模型,该文建立了珠江河口三维水动力数值模式,模式覆盖了上游三角洲河网区域、八大口门区域以及伶仃洋等近岸海域。该模式的水位、流速和流向验证结果表明模式能较为准确地反映伶仃洋的潮汐潮流变化过程。对珠江河口枯季水动力特性进行了数值模拟,并基于模拟结果分析了伶仃洋余流的时空变化特征及动力成因。结果表明,伶仃洋深槽中存在表层余流向海、底层余流向陆的河口环流特征,且河口环流特征随大小潮发生明显变化:小潮期间河口环流特征较为明显,小潮后的中潮期间最为显著,大潮时河口环流特征减弱,大潮后的中潮期间表底层余流几乎均为向海,河口环流特征趋于消失。这种纵向上的余流变化特征主要是与河口斜压作用有关。此外受东北风作用,伶仃洋横向上存在一个表层余流向西,底层余流向东的横向风生环流。
Based on FVCOM, a fully 3-dimentional hydrodynamic numerical model of the Pearl River Estuary was established with model domains covering the upstream river network, river mouth area and the offshore region. Model validations against tidal level, current speed and direction suggested that the model could correctly reproduce the hydrodynamic processes in the Lingdingyang Bay. Simulations on the hydrodynamics of the Pearl River Estuary during the dry season were conducted. Based on the model results, the characteristic of the residual current and its dynamic mechanism were analyzed. It was showed that the residual current in the deep channel of Lingdingyang Bay was featured by the typical estuarine circulation, with seaward current at surface and landward at bottom. The estuarine circulation varied in a spring-neap circle, which reached its maximum during the moderate tide after neap and almost disappears during the moderate tide after the spring. The spring-neap variation of the longitudinal estuarine circulation was closely related to the estuarine baroclinic effect. In addition, a lateral circulation, which was mainly driven by the northeast wind, was also observed with westward current at surface and eastward at bottom.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2014年第5期608-617,共10页
Chinese Journal of Hydrodynamics
基金
国家自然科学基金资助项目(11032007)
上海市环境科学研究院创新基金项目(CX201308)~~
关键词
珠江河口
伶仃洋
余流
动力机制
数值模拟
Pearl River Estuary
Lingdingyang Bay
residual current
dynamic mechanism
numerical simulation
