渤海三维潮流数值模拟

本模型以具有自由面的三维非线性Ｎａｖｉｅｒ－Ｓｒｏｋｅｓ方程为基本方程，经σ坐标变换得到模式方程。基于过程分裂法，将三维流动中的快过程与慢过程劈开，并对每部分选用适合其物理特性和数值行为的计算格式，然后耦联求解。应用本模型详细计算了渤海的三维潮运动。其中，潮波系统模拟获得理想的结果；采用十层模式计算了Ｍ２潮流，以较高的辨率揭示了潮流的空间结构特征。最后本文给出了三维潮流预报的应用实例。     

美国SLOSH模式在我国的应用

本文采用美国新一代的风暴潮数值预报模式，对影响杭州湾９次显著的台风风暴潮进行了模拟实验，获得令人满意的结果。表明，该模式在我国具有应用价值和广泛的推广前景。     

Dynmnic Response Analysis for Embedded Large-Cylinder Breakwaters Under Wave Excitation

A numerical model is developed for dynamic analysis of large-cylinder breakwaters embedded in soft soil. In the model, the large cylinder is taken as a rigid body divided into elements and the soft soil is replaced by discrete 3D nonlinear spring-dashpot systems. The numerical model is used to simulate the dynamic response of a large-cylinder breakwater to breaking wave excitation. The effects of the dynamic stress-strain relationship models of the soil, the radius and embedded depth of the cylinder, the nonlinear behaviors of the soil, and the limit strength condition of the soil on the dynamic responses of the large-cylinder structure are investigated with an example given. It is indicated that the above-mentioned factors have significant effects on the dynamic responses of an embedded large cylinder breakwater under breaking wave excitation.     

Three-dimensional numerical simulation of obfique wave action on vertical walls

A three-dimensional numerical model based on the potential theory was developed to study the oblique wave action on vertical walls. A source term inside the domain was used to generate incident waves and outgoing waves were dissipated by sponge layers and transmitted by radiation boundaries. The finite difference method was used to solve the governing equations and boundary conditions in the regular transformed domain in σ-coordinate. Satisfactory agreements between the numerical predictions and experimental results of wave force were obtained. It is concluded that the maximum wave force acting on the vertical walls is induced by the obliquely incident waves rather than the normally incident waves.     

3D Numerical Simulation of Overbank Flow in Non-Orthogonal Curvilinear Coordinates

1.Introduction Riverflowsinacompoundchannelofteninundatetheadjacentplainsathighdischarges.This generatesacomplicatedflowstructurebetweenthemainchannelflowandthefloodplainflow.In straightchannels,thevelocitydifferencebetweentheflowinthemainchannelandthatontheflood plainisoneofthemostdistinctivecharacteristics.Thisintroducesseveralphysicalandphenomenologi calfeaturesaroundthejunctionbetweenthemainchannelandthefloodplain,namely,theformation ofahighhorizontalshearlayerandstreamwiseandverticalvorti…     

任意截面大尺度垂直柱体的波浪力和水动作用力

许多海洋工程结构物和水工结构物,如海上贮油罐、各种支墩等,具有等截面柱状体外形,或在足够精确的工程近似意义上可视为这类柱体。它们的下端固置于水底,上端穿透水面,它们的波浪载荷是设计中的一个重要考虑因素;在许多场合,它们与周围流体的耦联振动也是相当重要的。对大尺度结构物而言,我们可在势流理论的范围内求解这一问题。通用的三维源汇分布法无疑是适用的,但对这类特殊的结构形式显得极不经济。     

闽江口水动力和污染扩散数值模拟

本文建立了闽江口二维水动力、污染扩散数值模型，模型采用ＡＤＩ双向隐式求解。在水动力模拟中，对岸界的丁坝有用线性边界进行拟合，并考虑到河口区侧向摩擦作用；在污染扩散模拟中，用动态拟合的方法对浓度水边界进行了较为合理的改进。计算结果表明，本模型是成功的。     

浅述多元数据处理的一种简化拟合形式及算法剖析

在实际工程试验与研究中 ,多元数据处理经常遇到 ,根据 Weierstrass定理 ,采用多项式拟合是一种常见的数据处理方法。对于多元多项式的系数求解问题 ,可以归结为超定方程组的求解问题。该文以超定方程组的 SVD求解算法为核心 ,阐述了在工程实际中关于多元数据处理的一种应用方法 ,并尝试给出多元多项式拟合的一种简化方法     

渤、黄、东海内潮的数值模拟

在全球的海洋中,中国东海和临近海域是最显著的内潮生成地之一。本文采用NODC(Levitus) World Ocean Atlas 1998提供的季平均温、盐资料,计算海水的密度,并计算垂向密度梯度的最大值点,得到一个较符合海水实际的密度分层。使用三维非线性数值模型(将海洋分为2层)研究了潮汐(M2,S2,K1,O1分潮)作用下渤黄东海的内潮,揭示了整个海区内潮起伏的空间分布,结果发现大振幅的波动均发生在台湾东北(冲绳海槽)海域和中国近海地形突变之处,其中前者更显著。对于各分潮模拟得到的表面潮与TOPEX/Poseidon高度计资料基本一致。研究结果表明上层海水的深度和厚度的梯度对内潮有一定的影响;冬季分布区域比夏季小,强度比夏季大。