摘要
由长江口现场水文测验资料分析知，洪水期潮波上溯过程中，潮波变形具有先加剧后趋缓的特点。基于非结构网格FVM 方法建立大通至外海的大范围数学模型，复演长江口潮波传播过程，以此为基础，研究长江口洪水期潮波变形特征的形成原因。研究认为：洪水期长江口潮波变形转折点位于潮流界上游；转折点下游潮波变形逐渐加剧是由于高低潮位潮波传播速度差异造成的；转折点上游潮波变形趋缓是由于高潮位重力引起的潮波传播阻力对潮波传播影响大于高低潮位潮波传播速度差异造成的。
From the analysis of hydrometry in the Yangtze estuary, the tidal wave deformation is intensified first and then slowed down from downstream to upstream during flood period. The mathematical model ranging from Datong station to the open seas is established to simulate tidal wave propagation in FVM and study the cause of tidal wave deformation characteristics in the Yangtze estuary during flood period. The study shows that the turning point of tidal wave deformation is located in the upstream of tidal current limit during flood period. The intensifying of tidal wave deformation downstream of the turning point is caused by the difference of tidal wave speed between high water level and low water level, while the reason for the relaxing of tidal wave deformation upstream of the turning point is that the resistance originated from high water level gravity to tidal wave propagation is more significant than the difference of tidal wave speed between high water level and low water level.
出处
《海洋工程》
CSCD
北大核心
2015年第1期73-82,共10页
The Ocean Engineering
基金
国家青年科学基金资助项目（51009095）
关键词
长江口
潮波变形
洪水期
FVM
传播速度
Yangtze estuary
tidal wave deformation
flood period
FVM
propagation speed
