A three-dimensional large-scale cloud model: testing the role of radiative heating and ice phase processes     

J. L. LEE  K. N. LIOU  S. C. OU 《地球，A辑:动力气象学与海洋学》1992,44(3):197-216

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Study on short-range numerical forecasting of ocean current in the East China Sea——Ⅰ Basic problems of ocean current forecasting and structure of the models     

Zhao Jinping  Chen Zhongyong  Shi Maochong 《海洋学报(英文版)》1993,12(3):335-345

Ocean current forecasting is still in explorative stage of study. In the study, we face some problems that have not been met before. The solving of these problems has become fundamental premise for realizing the ocean current forecasting. In the present paper are discussed in depth the physical essence for such basic problems as the predictability of ocean current, the predictable currents, the dynamical basis for studying respectively the tidal current and circulation, the necessity of boundary model, the models on regions with different scales and their link. The foundations and plans to solve the problems are demonstrated. Finally a set of operational numerical forecasting system for ocean current is proposed.  相似文献   

珠江三角洲网河区水位变化趋势研究   总被引：4，自引：0，他引：4  

沈焕庭  杨清书  罗宪林  罗章仁  杨干然  欧素英 《海洋学报》2002,24(2):30-38

根据珠江三角洲网河区29个验潮站的实测验潮记录,应用傅氏变换与最平滤波器串联的方法来消除月均序列的周期波动对确定水位变化趋势的影响,由低通序列一元线性回归分析确定各站水位的变化趋势;结果表明,周期波动对确定海平面变化趋势的影响是显著的.应用经验正交函数(EOF)对网河区的水位变化场进行分解,由相互独立的时间函数和空间特征函数表征网河区区域的水位变化特征;应用时间特征函数计算区域水位的平均变化率为0.02mm/a.根据验潮站的水位变化趋势,探讨网河区水位变化与河床冲淤的关系.  相似文献   

作用于平台桩腿的海冰屈曲破坏冰压力随机过程模型及其参数确定   总被引：2，自引：1，他引：2  

段忠东  欧进萍 《海洋工程》1996,(4)

冰对结构的作用过程是典型的随机过程。本文在冰压力过程为平稳过程的假设下，从渤海海冰对平台桩腿作用的大量实测冰压力数据中，选取了２１条冰屈曲破坏时的冰压力时程曲线，对它们进行谱分析后，得到了单点冰屈曲破坏的压力随机过程的谱密度，并确定了谱参数及其跟环境要素的关系，依据文献［１］中冰压力沿圆柱面的空间分布，建立了绕桩腿的冰压力随机场模型，并得到了作用于桩腿的总冰力随机过程及其谱密度。本文的研究成果为平台结构冰激随机振动和疲劳累积损伤分析提供了荷载基础  相似文献   

Practical implementation of Hilbert-Huang Transform algorithm   总被引：12，自引：0，他引：12  

Huang Daji  Zhao Jinping  Su Jilan 《海洋学报(英文版)》2003,22(1):1-14

Hilbert-Huang Transform (HHT) is a newly developed powerful method for nonlinear and non-stationary time series analysis. The empirical mode decomposition is the key part of HHT, while its algorithm was protected by NASA as a US patent, which limits the wide application among the scientific community. Two approaches, mirror periodic and extrema extending methods, have been developed for handling the end effects of empirical mode decomposition. The implementation of the HHT is realized in detail to widen the application. The detailed comparison of the results from two methods with that from Huang et al. (1998, 1999), and the comparison between two methods are presented. Generally, both methods reproduce faithful results as those of Huang et al. For mirror periodic method (MPM), the data are extended once forever. Ideally, it is a way for handling the end effects of the HHT, especially for the signal that has symmetric waveform. The extrema extending method (EEM) behaves as good as MPM, and it is better t  相似文献   

Calibration of LRFD Format for Steel Jacket Offshore Platforms in China Offshore Area （ 1 ） ： Statistical Parameters of Loads and Resistances     

段忠东周道成  欧进萍 《中国海洋工程》2006,20(1):1-14

1 .IntroductionThe structural design method has evolvedfromthe workingstress method,damage stage methodtolimit state method.The more recent probabilisticlimit state design method,whichis based onreliabili-tytheory,has beengenerallyacceptedinthe designcode…  相似文献   

光生物反应器中光衰减特征与螺旋藻生长动力学研究   总被引：3，自引：0，他引：3  

徐明芳  周远志  区德洪 《海洋科学》2001,25(11):32-37

分析了光照强度在光生物反应器中的分布特征，结果表明，当光波长及光传播的路径确定时，光生物反应器中光衰减特征主要受培养物生物量浓度的影响，由回归的模型对实验数据的拟合可分析光衰减特征与培养物生物量浓度的相关性，为光生物反应器中平均光照强度的确定奠定基础。在光生物反应器中，当营养底物和环境温度不是螺旋藻生长限制因子时，通过平均光照强度对螺旋藻比生长速率的影响分析，结果表明，在实验条件下，螺旋藻比生长速率与平均光照强度的动力学模型可用Aiba光生长抑制方程描述，光亲和系数Ks为238.29umol/(m^2.s)，光抑制系数Ki为0．00493s.m^2/umol，光生物反应器中螺旋藻生长的饱和光照强度出现在190－272umol/(m^2.s)的范围内。  相似文献   

The effects of sediment from an industrial outfall area on a marine planktonic ecosystem     

Wu Jinping 《海洋学报(英文版)》1990,9(1):151-158

-Sediment from Xiamen industrial area was added to marine ecosystem enclosures to test the effects on the planktonic communities in Xiamen Bay, China, in April, 1985. Sediments were added at two concentrations, 11.2 and 112 ppm dry wt. respectively. The species of phytoplankton did not change as compared with the control, but the number of diatoms markedly decreased in the sediment treated enclosures. A suppression of photosynthesis was presumed to be due to light attenuation by the added sediment. Microflagellates, zooplankton and bacteria were resistant to sediment increase in water column.  相似文献   

频谱分析在虎门大桥动态监测中的应用研究     

喻永平  方锋  林鸿  欧海平  杨光  孙晓明 《测绘信息与工程》2008,33(5)

采用了频谱分析法对虎门跨海悬索大桥进行安全监测,通过利用GPS RTK技术方法获取虎门大桥在台风激励下的动态监测数据,对动态监测数据进行时程分析和频谱分析,获取虎门悬索大桥的振动特性,得到了大桥的运营特征和实时位移特征.  相似文献   

萨拉乌苏河流域萨拉乌苏组沙丘砂沉积特征   总被引：7，自引：1，他引：7  

欧先交  李保生  靳鹤龄  吴正  温小浩  董光荣  曾兰华  欧阳椿陶  杨艺  刘宇飞 《地理学报》2006,61(9):965-975

萨拉乌苏河流域米浪沟湾剖面萨拉乌苏组含7层古流动沙丘砂、4层古固定-半固定沙丘砂.对这些沙丘砂的沉积构造观察以及粒度、扫描电镜和常量化学元素分析结果表明：（1）这些沙丘砂具有与现代沙丘砂相似的风成沉积构造特征;（2）粒度及其参数——Mz、σ、Sk和Kg,以及主要化学组分SiO2、Al2O3和TOFE也与现代沙丘砂相近;（3）Mz-σ、SiO2-Al2O3＋TOFE散点图和概率累积曲线显示这些沙丘砂与萨拉乌苏组中的河湖相、古土壤差别明显,而与现代沙丘砂一致;（4）石英砂颗粒具有良好的磨圆以及碟形坑、新月形坑、麻坑、上翻解理薄片、硅质沉淀和硅质裂纹等表面结构特征,反映其曾受持久的风力搬运作用.沉积构造、粒度、石英砂颗粒表面结构和化学元素等多个方面具备了与现代沙丘砂类似的风成特征,证明这些沙丘砂的成因是风成的.  相似文献