共查询到20条相似文献,搜索用时 109 毫秒
1.
连云港港区二维潮流计算 总被引:2,自引:0,他引:2
本文是在连云港整体物理模型试验的基础上,按照潮波能谱模式进行全港区二维潮流计算。本模式在空间上采用有限元法求解能谱控制方程中的水位,进而求得各分潮的水位和流速值。通过叠加求得任意时刻的水位、流速的瞬时值。该方法简捷、有效,适应性强。通过连云港西大堤工程的兴建与不建两种情况的计算,所得结果与物理模型试验结果进行了比较。证明该方法是成功的。 相似文献
2.
3.
4.
随着海岸侵蚀的日益加剧和人类对环境保护意识的增强,新型护岸养滩工程措施不断涌现,其中近自然的海底人工沙坝更是受到海岸工程界的青睐,并已在北戴河海滩恢复治理工程中得到成功应用.基于北戴河海域环境动力、泥沙输运和人工沙坝间的相互作用,从物理模拟和数值模拟两个方面进行研究.首先阐明物理模型试验所遵循的相似条件、制作方法和控制条件,并利用Delft3D软件对极限波高作用下的沙坝变形与岸滩演变进行了数值模拟,再将两种方法得到的地形结果进行了分析比较.研究结果表明:物理模型试验具有直观、快捷和精度较高的特点;数学模型则需不断调整计算参数、检查泥沙计算过程中的收敛性和成果的合理性.经反复验证的数学模型,其计算结果可以达到物理模型试验所要求的工程精度. 相似文献
5.
为了研究波浪非线性对爬高的影响,解决防波堤等工程设计的实际问题,通过对数学模型试验、物理模型试验、规范公式得到的防波堤波浪爬高对比分析,分析了非线性主要影响参数厄塞尔数、相对水深和波陡对波浪爬高的影响规律,指出规范公式计算时存在的缺陷,并对其计算公式、适用范围进行修正、拟合,得到了强非线性规则波浪爬高的计算方法,可适用于斜坡堤断面的波浪爬高计算,与物理模型试验和数学模型试验结果对比表明,新的波浪爬高计算公式具有较好的计算精度,研究结果可为防波堤等实际工程设计提供重要参考。 相似文献
6.
7.
深海观测系统脐带缆形态分析及计算 总被引:3,自引:0,他引:3
通过对水下拖曳系统脐带缆索的受力情况、形态进行分析,建立了三维空间缆索的物理模型和数学模型,并在此基础上编制了计算程序,对6000m深海观测系统脐带缆的性状进行了模拟计算,其结果为深拖系统最佳缆长的确定提供了理论依据。 相似文献
8.
9.
10.
连云港港口作为新亚欧大陆桥的东桥头堡具有独特的地理位置和良好的区位优势,目前已成为我国沿海的十大港口之一。文章在概述连云港港口发展现实情况的基础上,运用SWOT分析方法,对连云港港口的优势、劣势、机遇和挑战进行了详细的分析,最后提出了推动连云港港口发展的战略思考。 相似文献
11.
V. V. Efimov M. V. Shokurov D. A. Yarovaya 《Izvestiya Atmospheric and Oceanic Physics》2007,43(6):667-686
The paper describes results of numerical experiments on the simulation of a mesoscale quasi-tropical cyclone, a rare event for the Black Sea, with the MM5 regional atmospheric circulation model. General characteristics of the cyclone and its evolution and physical formation mechanisms are discussed. The balances of the momentum components have been estimated, and sensitivity experiments have been performed. It is shown that, according to its main physical properties and energy supply mechanisms, the cyclone can be related to quasi-tropical cyclones. 相似文献
12.
厦门港潮汐水流及浑水悬沙整体物理模型于1989年建成后,已进行了不少有意义的试验研究工作,取得较好效果。本文主要介绍模型的设计思想、相似准则、浑水悬沙相似理论的探讨、模型设计方法以及模型沙的选择等。 相似文献
13.
港口工程建设中经常采用挡沙堤防止工程功能区内产生明显的淤积,挡沙堤的平面布置及高程设计直接决定了其是否满足功能区的淤积要求,通过潮流物理模型试验可以直观地识别出泥沙输移路径及强输沙潮流所对应的瞬时潮位,泥沙输移路径可以决定挡沙堤的平面布置形式,强输沙潮流对应的瞬时潮位可以确定挡沙堤的堤面高程。根据实际工程的潮流、泥沙物理模型试验结果,论述了物理模型试验对挡沙堤布置方案设计的指导意义,试验结果显示,采用了相应的防淤措施使功能区内的淤积量明显减少,该方法对于海岸工程的防淤治淤具有一定的参考价值。 相似文献
14.
15.
This paper is a discussion of Sælevik et al. (2009). Their comparison between block and granular model results is described in more detail, along with a discussion of five parameters which may be in general responsible for deviations between block and granular models. New small scale physical model tests have been performed to support some of the statements made. Finally, it is argued that the use of physical model testing based on simplified geometries are justified in practice and normally produce results that are considerably better than an order of magnitude. 相似文献
16.
A nonlinear numerical model based on depth averaged equations and a relevant physical model have been investigated for the deformation of the water wave propagating over a submerged parabolic obstacle in the presence of uniform current. Physical and numerical modeling for wave with both following and opposing currents are done to explore the wave evolutions during passage over the submerged obstacle. A third-order Stokes dispersion relation is utilized in some cases in the computation. Separated flow zone is taken into consideration by two empirical equations obtained from the physical model testing done by the authors. Verification and validation of the numerical model by other published theoretical and experimental data are presented. 相似文献
17.
《Coastal Engineering》2005,52(8):709-725
Wave decay in a rubble mound breakwater has been analysed theoretically for various types of damping functions (linear, quadratic and polynomial). The applicability of these damping functions for wave decay in the landward part of the breakwater core has been investigated in large scale model tests. The properties of the rock materials that have been used in the model tests have been determined to provide a rational basis for the damping coefficients. The analysis is based on detailed measurements of wave conditions and pressure distributions inside the breakwater. The theoretical approaches have been validated and where necessary extended by empirical means. The wave decay inside the breakwater can be reasonably approximated by the commonly applied linear damping model (resulting in exponential wave height attenuation). An extended polynomial approach provides a slightly better fit to the experimental results and reflects more clearly the governing physical processes inside the structure. 相似文献
18.
A numerical study on dynamic properties of the gravity cage in combined wave-current flow 总被引:2,自引:0,他引:2
Yun-Peng Zhao Yu-Cheng Li Guo-Hai Dong Fu-Kun Gui Bin Teng 《Ocean Engineering》2007,34(17-18):2350-2363
Recent work in the area of open-ocean aquaculture-system dynamics has focused either on the response of fish cages in waves or the steady drag response from ocean currents, not on them combined. In reality, however, the forces bearing on these open-ocean structures are a nonlinear, multidirectional combination of both waves and current profiles. In this paper, a numerical model has been developed to simulate the dynamic response of the gravity cage to waves combined with currents. When current flows are combined with regular waves, gravity-cage motion response (including heave, surge, and pitch) and mooring-line forces have been calculated. To examine the validity of simulated results, a series of physical model tests have been carried out. The results of our numerical simulation are all in close agreement with the experimental data. 相似文献
19.
《Deep Sea Research Part I: Oceanographic Research Papers》2000,47(5):937-970
A biomass-based ecological model is presented here for the Adriatic Sea. The hydrodynamical part is composed of the Princeton Ocean Model, while the European Regional Seas Ecosystem Model describes the biogeochemical processes. An idealized Adriatic basin geometry has been used, with perpetual year seasonal cycle forcing the hydrodynamics and river-borne nutrient input forcing externally the biogeochemical processes. The simulation results highlight the role of the physical processes in determining and maintaining some of the nutrient and phytoplankton biomass distribution and characteristics in the basin. The characteristics of the phytoplankton seasonal cycle have been found to depend, in order of priority, on the river-borne nutrient input and physical horizontal and vertical processes. 相似文献
20.
Shutang Zhu 《Ocean Engineering》1999,26(12):535
This paper presents a transfer function method (TFM) which can separate a regular wave field into incident and reflected waves based on the linear wave theory. The TFM uses specific transfer functions and corresponding convolution integrals to separate time series data measured in a combined partial standing wave system into incident and reflected waves. After this separation, estimation of the reflection coefficient becomes very easy. All manipulations have been performed in time domain. Furthermore, this method does not involve the calculation of wave heights and/or phase differences. The present method is demonstrated through numerical sample and physical model experiments carried out in a wave flume. Compared with other methods, the TFM gives much better estimates of the incident wave heights for physical model experiments in this study. 相似文献