枯季伶仃航道三期工程对盐淡水混合的影响

发布时间：2018-04-14 11:28

本文选题：枯季 + 大潮　；参考：《华南理工大学学报(自然科学版)》2017年04期

【摘要】：伶仃洋为一典型的复合型潮汐河口湾,以潮流动力作用为主.伶仃洋枯季盐淡水混合具有很大的时空变化特点,不能认为是单一的缓混合型;另外,航道加深会影响动力及物质输运.文中在动力地貌学的基础上,采用机制分解法和三维数学模式研究了航道三期工程前后航道的动力变化和盐淡水混合特征.结果表明:伶仃航道上、中、下3个区段的动力特点以及盐淡水混合机制不同;工程后陆架水从底层入侵河口比较明显;涨、落潮流速增大,航道的垂向环流明显增强;表层的流速增大幅度较底层大;工程后分层系数和环流系数都有所加大,盐淡水混合作用加强.
[Abstract]:Lingdingyang is a typical complex tidal estuary with tidal current dynamics.The mixing of salt and fresh water in the dry season of Lingdingyang is characterized by great temporal and spatial variation, which cannot be considered as a single slow mixing type, in addition, the deepening of waterway will affect the dynamic and material transport.On the basis of dynamic geomorphology, the dynamic changes of waterway and the mixing characteristics of salt and fresh water before and after the third phase of waterway project are studied by mechanism decomposition method and three-dimensional mathematical model.The results show that the dynamic characteristics and the mixing mechanism of salt and fresh water are different in the three sections of Lingding Waterway, and the vertical circulation of the channel is obviously enhanced when the continental shelf water invades the estuary from the bottom layer, the velocity of falling tide increases, and the vertical circulation of the channel increases.The velocity of the surface layer is larger than that of the bottom layer, the stratification coefficient and circulation coefficient are increased, and the mixing of salt and fresh water is strengthened.
【作者单位】：华南理工大学土木与交通学院;
【基金】：国家自然科学基金资助项目(10902039)~~
【分类号】：U612

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