共查询到20条相似文献,搜索用时 31 毫秒
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前人已开展了大量的关于图解法和矩值法数值结果的相关性分析和相互转换方程的确定工作,但针对定性结果的对比仍较为罕见。本文选取了琼州海峡两岸15个海滩22条断面105个表层沉积物为典型研究对象,分别采用Folk和Ward图解法和Friedman矩值法获取粒度参数结果,构建定量结果的回归关系和对比定性结果的异同。结合前人的研究成果,本文进一步探讨了两种方法结果的可对比性,并分析两种方法的方法差异对沉积物粒度信息提取及使用造成的可能影响。研究结果表明:(1)就定量结果而言,图解法和矩值法计算的平均粒径和分选系数具有强相关性(R2≥0.951),而偏态和峰态则表现为中等相关(R2=0.586)和不相关(R2=0.011),表明图解法和矩值法计算粒度参数定量结果之间的相关性并不稳定,这与前人的研究结果基本一致;(2)就定性结果而言,图解法和矩值法的结果之间存在较大偏差,分选系数、偏态和峰态不一致的占比分别达30.48%、55.24%和71.43%,这与定量结果的相关性存在一定程度的偏差,表明定量结果的相关性程度并不能完全用于指示定性术语结果的一致性程度。鉴于最大化地揭示沉积物的差异是粒度参数分析方... 相似文献
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The 17th ITTC Ocean Engineering Committee undertook the comparison of methods for calculating semi-submersible wave motion, and 34 programs from 28 different organizations participated in the project. The summary of the results are reported in the Technical Report of the 17th ITTC (ITTC, 1984).In this paper, the details of the project are described. Namely, almost all the calculation results of the 34 programs are shown and examined from the viewpoints of the validity of the program itself and of the correlation between the differences in the various calculation methods and the differences in the calculation results. The calculation results are also compared with the experiments, the details of which are also illustrated. 相似文献
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Several ray-type 1D and 2D KdV equations for two-layer stratified ocean with topographic effect are derived in detail in the present study.A simplified version of these equations,ray type 1D KdV equation,is used to calculate numerically the disintegration of initial interface soliton from the deep sea to the continental shelf.At the same time,a laboratory experiment is carried out in a 2D stratified flow and internal wave tank to examine the numerical results.A comparison of the numerical results with the experimental results shows that they are in good agreement.The numerical results also show that the ray-type KdV equation has high accuracy in describing the evolution of initial interface waves in shelf/slope regions.Form these results,it can be concluded that the fission process is a dominant generating mechanism of interface soliton packets on the continental shelf. 相似文献
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三维I型超长管线阴极保护的数值模拟 总被引:1,自引:1,他引:1
研究超长管线阴极保护设计问题的数学模型和数值模拟,并将介质电阻、金属面电阻及金属自身电阻作了系统处理。通过数值试验与实验结果的对比,肯定了所提出的数学模型及所用边界元法在处理此类问题时的合理性及有效性。 相似文献
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When a vessel is damaged, seawater floods into the damaged compartments and subsequently influences the motion of the vessel. Furthermore, the vessel’s behaviour affects the floodwater motion. In this paper, a Navier-Stokes (NS) solver with a free surface capturing technique, i.e., the volume of fluid (VOF) method, was developed to numerically simulate water flooding into a damaged vessel. To verify the developed solver, a 2-D and a 3-D dam break problems were tested. The numerical results coincide well with the experimental results and with the published numerical results. Additionally, it was used to solve the problems of linear and non-linear liquid sloshing in a hexahedral tank. The numerical results are satisfactory in comparison with the experimental results and analytical solutions. Finally, the phenomenon of water flooding into a damaged compartment of a Ro-Ro ferry was simulated numerically. The computed results are in good agreement with the experimental data. 相似文献
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The comparison of altimeter retrieval algorithms of the wind speed and the wave period 总被引:1,自引:1,他引:1
Recent (2007-2010) research results about ocean’s role in climate variation and change by Chinese scientists are highlighted. This paper reviews a majority contributions by Chinese scientists to the understanding of ocean variability and change. This paper starts with the results about the important role of the tropical Indian Ocean in interannual variation of the Asia summer monsoon, the effect of sea surface temperature (SST) and freshwater flux on climate variability in the Pa- cific, and interannual variability research in other oceans. Then results about ocean dynamic and thermodynamic roles in decadal climate variation are reviewed. Finally, the results about oceanic response to global warming are discussed, again showcasing ocean’s important role in climate. 相似文献
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Qiu Dahong Zang Jun Jia Ying
Academician of the Chinese Academy of Sciences Professor the State Key Laboratory of Coastal Offshore Engineering 《中国海洋工程》1996,(2)
Based on the 2nd order cnoidal wave theory, the characters of shallow water standing waves and their action on vertical walls are studied in this paper. The theoretical expressions of the wave surface elevation in front of and the wave pressure on the vertical wall are obtained. In order to verify the theoretical results, model tests were made in the State Key Laboratory of Coastal and Offshore Engineering at DUT. For the wave surface elevation in front of the wall and the wave forces on the wall at the moment when the wave surface at the wall surface goes down to the bottom of the wave trough, the calculated results coincide quite well with the experimental results. For the wave forces on the wall at the moment when the wave surface at the wall surface goes up to the top of the wave crest, the theoretical expressions are modified by the experimental results. For the convenience of practical use, calculations are made for the wave conditions which usually occur in enginering practice by use of the inves 相似文献
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Dan Obreja Radoslav Nabergoj Liviu Crudu Săndiţa Păcuraru-Popoiu 《Ocean Engineering》2010,37(8-9):678-687
The results of numerical and experimental investigations on the manoeuvring performance of a fishing vessel, typical for Mediterranean Sea, are here presented. PMM experiments were used for evaluating hydrodynamic derivatives and implementing the theoretical model. The simulation model was validated, both with zig-zag and spiral experimental model tests results in still water and compared with Tribon Initial Design module results. 相似文献
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This paper presents results of experimental and mathematical modelling of beach and dune erosion under storm events. Re-analysis of the experimental results on dune erosion in small-scale and large-scale flumes shows that the dune erosion for extreme conditions is somewhat smaller than that based on earlier analysis results. 相似文献
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根据冲量相似的要求进行船舶在冲击作用下的模型试验,并将模型试验结果与理论计算及实际试验进行了对比和分析。 相似文献
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—In this paper,the second-order perturbation method in frequency domain is used to calculateRAO and spectra of motion and mooring line tension of a turret-moored tanker in ballast condition.Thecalculated results are compared with corresponding experiment results.In the experiment the wave head-ing is 180°,and the wave spectra is the P-M spectrum and white noise spectrum.In the theoretical calcu-lations,the damping coefficient of slow oscillation of the tanker is determined on the basis of the dampingobtained from a test of irregular waves where the mooring system is replaced by a nonlinear spring withnonlinear stiffness similar to that of the mooring system.From the comparison between theoretical calcula-tions and experimental results,it can be found that the theoretical results obtained by the second-orderperturbation method in frequency domain are in good agreement with the experimental results,indicatingthat the damping coefficient of slow oscillation of the tanker required in frequency domain calcu 相似文献
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The results of a test experiment comparing quasi-synchronous data of three adjacent acoustic Doppler current profilers (ADCPs) deployed on the shelf bottom of the Black Sea in September 2014 are considered. The direct aim of the experiment was quantitative comparison of data from different ADCPs placed in maximally similar conditions to simultaneously measure the sea current parameters at one geographic point. The goals and the scheme of the experiment, methods for processing the measurement results, main results, and their interpretations and analysis, including practical results and conclusions, are described. 相似文献
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In this paper, the motions are studied of a multi-body which is composed of two plates hinged together and moored by eight mooring lines in regular waves. The experimental results are compared with computational results. The linear po-tential theory and the perturbation method are combined to study this complicated system. The former is used to calculate the wave forces acting on the plates and the motion responses of them, while the latter is used to describe the dynamic character of the eight mooring lines coupled with the two hinged plates. Some response results of each plate are presented and comparisons between calculated results and experimental data are given. All the calculations are confined to regular beam waves. 相似文献
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A. N. Ovsuchenko M. Yu. Menshikov E. A. Rogozhin A. M. Korzhenkov 《Izvestiya Atmospheric and Oceanic Physics》2016,52(8):816-840
The results of comprehensive research into the area of the upper reach of the Mzymta River (Western Caucasus) are presented. The evidence of strong earthquakes that struck the study area throughout history is studied. The periods when mud flows and rockslides associated with the earthquakes are identified to fall between 3100–4000 and 700–1200 years ago. Paleoseismological results are correlated to the results of archeological excavations. As a result, it is revealed that the periods of tectonic disasters coincided with the onsets of the period when the area was uninhabited (abandoned) by people. The results of the present comprehensive research provide additional information to specify the seismic hazard and the chronology of human habitation in the region. 相似文献