COMCOT数值模式的介绍和应用   总被引：1，自引：0，他引：1  

潘文亮  王盛安 《海洋预报》2009,26(3):45-52

介绍了一个成熟的海啸数值模式-COMCOT模式.COMCOT模式是一个能够模拟海啸产生、传播和增水全过程的基于浅水波方程的有限差分模型.模型采用多层网格嵌套,根据海啸在不同区域的传播特点和要求,分别选用不同的分辨率和计算设置,从而兼顾了模式的精度和计算效率.利用此模式模拟了2006年12月26日台湾南部7.2级地震产生海啸波的传播情况,结果与两个潮位站的海啸波监测数据相吻合.  相似文献   

Simulation Study on High Energy Cosmic Electron Detection by Shower Image     

Rong Xu Jin Chang S. Torii K. Kasahara T. Tamura K. Yoshida 《天体物理学报》2007,7(6):839-844

Many projects have recently been carried out and proposed for observing high energy electrons since it is realized that cosmic ray electrons are very important when studying the dark matter particles and the acceleration mechanism of cosmic rays. An imaging calorimeter, BETS （Balloon-borne Electron Telescope with Scintillator fiber）, has been developed for this purpose. Using pattern analysis of the shower development, the electrons can be selected from those primary cosmic ray proton events with flux heights one-tenth that of the electrons. The Monte-Carlo simulation is indispensable for the instrument design, the signal trigger and the data analysis. We present different shower simulation codes and compare the simulation results with the beam test and the flight data of BETS. We conclude that the code FLUKA2002 gives the most consistent results with the experimental data.  相似文献   

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邵志刚  傅容珊  薛霆虓  黄建华 《大地测量与地球动力学》2007,27(5):31-37

????????????????????Burgers????????????????????????α? ??????????:??Burgers????????????????????????????????????????????????????????????????????????????? ???????????Burgers??????????????????Maxwell???Kelvin??????????????????α?????Э??????  相似文献   

NUMERICAL SIMULATION OF THE MINDANAO EDDY AND TROPICAL CURRENTS OF PACIFIC OCEAN     

李荣凤  曾庆存  季仲贞 《中国海洋湖沼学报》1992,10(3):258-267

Results of numerical simulation of currents in the western North Tropical Pacific Ocean by using a barotropic primitive equation model with fine horizontal resolution agreed well with observations and showed that the Mindanao Cyclonic Eddy located north of the equator and east of Mindanao Island exists during most of the year with monthly (and large seasonal) variations in scope . strength and central location . In June , an anticyclonic eddy occurs northeast of Halmahera Island, strengthens to maximum in August , exists until October and then disappears . The observed large-scale circulation systems such as the North Equatorial Current . the Mindanao Current and the North Equatorial Countercurrent are all very well reproduced in the simulations.  相似文献   

Some consequences of applying lognormal theory to pseudolognormal distributions     

Richard F. Link  George S. Koch Jr. 《Mathematical Geology》1975,7(2):117-128

A logarithmic transformation may be used to improve the efficiency of estimates of the mean when observations follow the lognormal distribution. But if this transformation is applied to observations that follow another distribution, bias may be introduced. We consider some consequences of erroneously applying lognormal estimation theory and demonstrate that biased estimates may be obtained for certain classes of distributions. Illustrations of bias obtained in gold sampling are given.  相似文献   

Analytical calculations related to facies simulation     

T. Egeland  F. Georgsen  Ø. Skare  F. Alabert 《Mathematical Geology》1995,27(3):391-398

The paper presents calculations related to the volumes of different facies types. Asymptotic distributions are derived approximating the volumes of facies proportions. The number of bodies required to meet net-gross specifications are shown to follow an inverse gaussian distribution. The calculations typically are performed prior to simulations of reservoir facies and may add substantially to the understanding of the model. In particular, analytical results are useful when it comes to assessing parameters of complex simulation models. The theoretical distributions agree well with results based on marked point process simulations of a turbiditic reservoir.  相似文献   

空间太阳望远镜高速数据传输系统     

耿立红 《天文研究与技术》2002,(1)

“空间太阳望远镜”是中国的一项非常重要的天文卫星计划。卫星上将搭载 5个有效载荷 ,在可见光、远紫外、硬X射线、软X射线、Hα和射电波段同时观测太阳 ,其中的主光学望远镜口径达 1m。各有效载荷的CCD器件和其它敏感器件每天采集的科学数据量经过预处理后达 50Gbytes,再由数据压缩系统压缩至 8Gbytes,并储存在海量存储器中。如此庞大的数据量要求空间太阳望远镜的科学数据传输系统以高达 60Mbps的码速率向地面站传送。本文所有的工作均围绕着空间太阳望远镜高速数据传输系统展开 :1 .根据空间太阳望远镜的需求 ,综合研究、分析了它的科学数据传输系统的性能指标和特点 ,并作总体的方案设计 ;2 .设计开发了科学数据传输系统的信道编码和信道解码单元。信道编码单元将把海量存储器中的数据转换为适于QPSK射频调制格式化的串行数据流 ,信道解码单元实现相反的过程 ,文中详细给出了信道编码系统的原理、方法和实验结果。设计中引入了新的设计思想和方法 ,通信协议与现有地面站兼容 ;3 .完成了信道编码、解码环路的地面试验 ,结果表明信道编码、解码系统的技术指标完全符合空间太阳望远镜的要求。在理想无噪声条件下 ,闭环试验数据传输结果无误码 ,数据传输率达 60Mbps,是目前国内科学数据传输系统码速率  相似文献   

一种生成大周期伪随机数的新算法——改进的混合同余法     

郭凤鸣 《地球科学》1992,(6)

为了克服当前所生成的伪随机数周期小、每个随机数仅能出现1次而不能重复的缺点,本文提出了一种生成伪随机数的新方法,称为改进的混合同余法。  相似文献   

Primary proton spectrum around the knee deduced from the emulsion-chamber data obtained at Mts. Fuji and Kanbala     

J. Huang  N. Hotta  K. Kasahara  I. Ohta  S. Ozawa  T. Saito  M. Shibata  X. W. Xu  T. Yuda 《Astroparticle Physics》2003,18(6):637-648

We have done extensive Monte Carlo simulations using the new simulation codes of CORSIKA and COSMOS to compare with the gamma-family data obtained at Mts. Fuji (3750 m above sea level) and Kanbala (5500 m above sea level). Then, we estimated the primary proton and helium spectra around the knee energy region using a multiple-layered feed-forward neural network as a classifier of primary particle kind. The selection efficiency of proton-induced family events is estimated to be 82%. The flux value of protons at 2×10¹⁵ eV is (5.5±1.5)×10⁻¹⁴ (m⁻² s⁻¹ sr⁻¹ GeV⁻¹). The result suggests heavy-enriched primary composition around the knee region.  相似文献   

MULTI-DIMENSIONAL NUMERICAL STUDIES OF CONVECTION-RELATED STELLAR PROBLEMS     

Chan Kwing Lam 《紫金山天文台台刊》2003,(2)

1　IntroductionManybottlenecksinthetheoreticalstudyofstellarevolutionarisefromthelackofunder standingofsomehighlycomplicatedprocessesthatcannotbetreatedwithanalyticaltech niques .Alargeportionoftheseprocessesisrelatedtohydrodynamics,particularlyconvec tion .Theapplicationofmultidimensionalnumericalcomputationstotheinvestigationofthesedifficultproblemshasmadegreatprogressinrecentyears .Here ,weprovideasurveyoftherecentnumericalstudiesofconvectionrelatedproblems.Theobjectiveistoassistthosewhoar…  相似文献