共查询到19条相似文献，搜索用时 140 毫秒
1.
渤海风场的模拟及风暴潮数值计算 总被引：3，自引：6，他引：3
众所周知,历史上渤海沿岸曾多次遭受强风暴潮的侵袭.因此,风暴潮机制和预报的研究是十分重要的,近几年来,国内许多学者曾对渤海的风暴潮进行过一些研究,并取得了有益的成果.其中,山东海洋学院建立的超浅海零阶模型为浅海风暴潮理论及数值计算奠定了基础. 相似文献
2.
孙文心 《中国海洋大学学报(自然科学版)》1987,(1)
1975年秦、冯创建了“超浅海风暴潮”模型。此后,有若干文献〔2-5〕以及一些尚未发表的论文。从数值模拟以及理论方面将此模型用于研究渤海风潮,均获得一定结果,证实了该模型的实用价值。本文从理论上对超浅海风曝潮模型的波动性,垂直变涡动系数、底磨擦表达式以及可变边界问题进行探讨。 相似文献
3.
超浅海风暴潮的进一步研究 总被引：3，自引：0，他引：3
孙文心 《山东海洋学院学报》1987,17(1):34-45
1975年秦、冯创建了“超浅海风暴潮”模型。此后．有若干文献（2-5)以及一些尚未发表的论文，从数值模拟以及理论方面将此模型用于研究渤海风潮。均获得一定结果，证实了该模型的实用价值．本文从理论上对超浅海风曝潮模型的波动性，垂直变涡动系数、底摩擦表达式以及可变边界问题进行探讨． 相似文献
4.
孙英兰 《中国海洋大学学报(自然科学版)》1984,(1)
1975年秦曾灏、冯士筰提出“超浅海风暴潮”理论及相应的动力学模型(简称秦、冯模型),给出了风暴潮位预报方程及风暴潮流的解析解,经数值检验,该理论适用于渤海风潮,但涡动系数采用与深度无关的常数值,是物理假设上的一个弱点。 为了改进上述模型,1979年冯士榨、施平又提出了“含变涡动系数的超浅海风暴潮 相似文献
5.
在文献[1]的基础上,本文又以超浅海风暴潮—阶模型对渤海风潮进行了数值模拟,并基于天气图对一次实际风潮做了试算,对数值结果进行了分析, 相似文献
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在文献的基础上，本文又以超浅海风暴潮一阶模型对渤海风潮进行了数．值模拟，并基于天气图对一次实际风潮做了试算，对数值结果进行了分析。 相似文献
8.
孙英兰 《山东海洋学院学报》1984,14(1):54-67
1975年秦曾灏、冯士筰提出“超浅海风暴潮”理论及相应的动力学模型(简称秦、冯模型)，给出了风暴潮位预报方程及风暴潮流的解析解，经数值检验，该理论适用于渤海风潮，但涡动系数采用与深度无关的常数值，是物理假设上的一个弱点。 相似文献
9.
北部湾是一个半封闭的超浅海。本文在数值试验的基础上，提出了一个研究该海域台风风暴潮的数值模型。数值模式为二维深度平均流模型，采用嵌套细网格技术，细网格分辨率为沿经纬方向０．１°，细网格边界值由粗网格提供。台风风场计算采用Ｊｅｌｅｓｎｉａｎｓｋｉ模型风场．模式方程组的数值解由交替方向隐式（ＡＤＩ）方法积分得到。本文对该海域最常见的两种台风移行所引起的风暴潮进行了数值模拟。与几个潮汐观测站的增水记录比较，计算结果基本上反映了台风引起的水位变化，对研究和模拟该海域台风风暴潮是适用的，可用于该海域风暴潮数值预报试验。 相似文献
10.
宋丽娜 《中国海洋大学学报(自然科学版)》1987,(2)
本文将流速分解模型应用于作为超浅海风暴潮的渤海风潮,并讨论了变湍粘性系数的确定。作为一个初步的,但较为成功的数值试验例子,描述了实际风场作用下的渤海风潮,比较了变湍粘性系数模型与常湍粘性系数模型的计算结果间的差异。 相似文献
11.
- A one-layer time-invariant eddy viscosity model is specified to develop a mathematical model for describing the essential features of the turbulent wave boundary layer over a rough bed. The functional form of the eddy viscosity is evaluated based on computational results from a two-equation turbulence model in which the eddy viscosity varies with time and space. The present eddy viscosity model simplifies much of the mathematical complexity in many existing models. Predictions from the present model have been compared with a wide range of experimental data. It is found that the eddy viscosity model adopted in the present study is physically reasonable. 相似文献
12.
A one-layer time-invariant eddy viscosity model is specified to develop a mathematical model for describing the essential features of the turbulent wave boundary layer over a rough bed. The functional form of the eddy viscosity is evaluated based on a modified one-equation turbulence model in which the eddy viscosity varies in time and space. The present eddy viscosity model simplifies much of the mathematical complexity in many existing models. Predictions from the present model have been compared favorably with a wide range of experimental data. It is found that the eddy viscosity model adopted in the present study is physically reasonable. 相似文献
13.
基于大涡模拟和局部滤波同化方法的海洋环流模式 总被引：3，自引：1，他引：2
结合最小二乘法极值原理,提出了一种基于局部谱展开的滤波同化方法,把测量数据和数值计算过程中出现的高频短波滤掉,并将高度计数据同化到了求解过程中.结果既增加了数值稳定性,又提高了数值模拟的准确性.针对在海洋环流问题中水平的流动性质和垂直的不同的特点,我们还将大涡模拟的思想和直接涡黏的思想分别应用于水平方向和垂直方向,给出的方法是一种适用于海洋环流和浅水环流问题的大涡模拟湍流模式.对热带和北太平洋一年四季非定常季风作用下环流的数值模拟表明,提出的方法非常有效,数值结果与实际相当吻合. 相似文献
14.
Dag Myrhaug 《Ocean Engineering》1984,11(3):315-320
An analytical theory which describes the motion in an oscillatory smooth turbulent boundary layer using a two-layer time invariant eddy viscosity model is presented. The eddy viscosity in the inner layer increases quadratically with the height above the wall. In the outer layer the eddy viscosity is taken as a constant. 相似文献
15.
A new set of Boussinesq-type equations describing the free surface evolution and the corresponding depth-integrated horizontal velocity is derived with the bottom boundary layer effects included. Inside the boundary layer the eddy viscosity gradient model is employed to characterize Reynolds stresses and the eddy viscosity is further approximated as a linear function of the distance measured from the seafloor. Boundary-layer velocities are coupled with the irrotational velocity in the core region through boundary conditions. The leading order boundary layer effects on wave propagation appear in the depth-integrated continuity equation to account for the velocity deficit inside the boundary layer. This formulation is different from the conventional approach in which a bottom stress term is inserted in the momentum equation. An iterative scheme is developed to solve the new model equations for the free surface elevation, depth-integrated velocity, the bottom stress, the boundary layer thickness and the magnitude of the turbulent eddy viscosity. A numerical example for the evolution of periodic waves propagating in one-dimensional channel is discussed to illustrate the numerical procedure and physics involved. The differences between the conventional approach and the present formulation are discussed in terms of the bottom frictional stress and the free surface profiles. 相似文献
16.
根据湍流封闭理论,建立一种适用于正压浅海湍流运动的雷诺应力封闭模型(RSM),以代替目前三维浅海动力学模型中普遍采用的湍粘性系数的传统假设。通过直接建立并模化f—平面上正压海洋的雷诺应力传输方程,分别得到的微分形式和代数形式的RSM方程组。并讨论了进行数值计算所需要的边界条件。利用该模型可以进一步研究浅海潮流、风暴潮流及风海流等浅海流动的三维结构和湍流特性。 相似文献
17.
Dag Myrhaug 《Ocean Engineering》1982,9(6):547-565
An analytical theory which describes the motion in a turbulent wave boundary layer near a rough sea bottom by using a two-layer time invariant eddy viscosity model is presented. The eddy viscosity in the inner layer increases quadratically with the height above the sea bottom. In the outer layer the eddy viscosity is taken as a constant. The mean velocity and shear stress profiles, the bottom shear stress and the bottom friction coefficient are presented, and comparisons are made with experimental results. 相似文献
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19.
John B. Christoffersen 《Ocean Engineering》1985,12(5):387-423
Two simple two-layer eddy viscosity models, which facilitate analytical solutions, are presented in order to describe the velocity field and associated shear stress in a combined current wave motion. The models, which have the same eddy viscosity in the current boundary layer, but different eddy viscosities in the wave boundary layer, cover together the whole rough turbulent regime. Straightforward definitions are made for the wave friction factor and the current friction factor for the combined motion, which are in accordance with the results for pure waves and pure currents. In this way one avoids the fictitious reference velocities and elliptic integrals which e.g. Grant and Madsen (1978, 1979) experienced. The two friction factors turn out to be functions of four dimensionless parameters. A detailed calculation procedure is presented. Comparison with laboratory experiments yields promising results. A new relation connecting dissipation and bed shear stress is also developed. 相似文献