Measurement of nuclides of uranium and thorium series of disequilibrium using γ-spectroscopy   总被引：3，自引：0，他引：3  

Liu Guangshan  Huang Yipu  Li Jing  Ye Lin 《海洋学报(英文版)》2002,21(4):505-517

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｒａｄｉｏｎｕｃｌｉｄｅｓｏｆｎａｔｕｒａｌｕｒａｎｉｕｍａｎｄｔｈｏｒｉｕｍｓｅｒｉｅｓｃａｎｂｅｕｓｅｄｔｏｔｒａｃｅｍａｒｉｎｅｐｒｏ ｃｅｓｓｏｆｖａｒｉｏｕｓｔｅｍｐｏｒａｌａｎｄｓｐａｔｉａｌｓｃａｌｅａｎｄｐｒｏｐｅｒｔｉｅｓｔｈａｔｐｒｏｖｉｄｅｐｌｅｎｔｉｆｕｌｉｎｆｏｒｍａｔｉｏｎａｂｏｕｔｐｈｙｓｉｃｓ,ｃｈｅｍｉｓｔｒｙ ,ｇｅｏｓｃｉｅｎｃｅａｎｄｂｉｏｌｏｇｙｏｆｏｃｅａｎｂｅｃａｕｓｅｔｈｅｙｈａｖｅｄｉｆｆｅｒｅｎｔｃｈｅｍｉｃａｌｐｒｏ…  相似文献   

南海罗斯贝变形半径的地理及季节变化   总被引：3，自引：1，他引：3  

甘子钧  蔡树群 《热带海洋学报》2001,20(1):1-9

根据南海 1°× 1°网格的标准层季节平均温、盐度资料 ,在未引入Boussinesq近似条件下 ,采用改进的Thompson Haskell算法求解线性化斜压海洋水平大尺度波的垂直结构方程 (重力内波方程 ) ,从而得到了南海各网格点的第一斜压重力波相速度和相应的罗斯贝变形半径 ,并探讨其地理分布和季节变化特征 ,以期有助于南海环流和中尺度涡旋以及有关海洋侧边界效应的研究。  相似文献   

考虑非线性弥散影响的波浪变形数学模型   总被引：3，自引：1，他引：3  

李瑞杰 《海洋学报》2001,23(1):102-108

提出了逼近Kirby和Dalrymple的非线性弥散关系的显式非线性弥散关系的表达式,该显式表达式与他们的非线性弥散关系的精度几乎完全相同.采用显式非线性弥散关系,结合含弱非线性效应的缓坡方程,得到考虑非线性弥散影响的波浪变形数学模型,并对该数学模型进行了数值验证.结果表明,考虑非线性弥散影响的波浪变形数学模型更为精确.  相似文献   

Transformation of Lambert Conic Conformal Coordinates from a Global Datum to a Local Datum     

E. Grafarend  F. Okeke 《Marine Geodesy》2007,30(4):297-313

This paper treats the problem of how to transform from global datum, for example, from the International Terrestrial Reference System (ITRS), to a local datum, for example, regional or national, for the practical case of the Lambert projection of the sphere or the ellipsoid-of-revolution to the cone. We design the two projection constants n(ϕ₁, ϕ₂) and m(ϕ₁) for the Universal Lambert Conic projection of the ellipsoid-of-revolution. The task to transform from a global datum with respect to the ellipsoid-of-revolution E_A,B² to local datum with respect to the alternative ellipsoid-of-revolution E_a,b², without local ellipsoidal height, is solved by an extended numerical example. Ideas in this paper could be of interest to those working with maps and coordinates transformation from global geodetic datum to local geodetic datum and vice versa, under the Universal Lambert Conic projection, and applicable to precise positioning and navigation, boundary demarcation and determination in the marine environment.  相似文献   

Triple diagram method for the prediction of wave height and period   总被引：1，自引：0，他引：1  

Mehmet zger  Zekai en 《Ocean Engineering》2007,34(7):1060-1068

Many formulations have been developed so far to predict the wave height and period from fetch length and wind blowing duration for a constant wind speed. This study aimed to predict wave parameters from fetch length and meteorological factors by using triple diagram methodology based on Kriging principles. Proposed model results were compared with Joint North Sea Wave Project (JONSWAP) model which is used so commonly in the ocean and coastal engineering studies. For the implementation of the methodology hourly wave and wind data were obtained from a buoy located in Lake Ontario. Numerical and graphical comparisons demonstrated that the proposed method outperforms the classical formulation.  相似文献   

Resources calculation of cobalt-rich crusts with the grid subdivision and integral method     

WU Ziyin  CHU Fengyou  MA Weilin  LI Shoujun  SHANG Jihong 《海洋学报(英文版)》2007,26(5):43-53

On the basis of three geological models and several orebody boundaries,a method of grid subdivision and integral has been proposed to calculate and evaluate the resources of cobalt-rich crusts on the seamounts in the central Pacific Ocean.The formulas of this method are deduced and the interface of program module is designed.The method is carried out in the software "Auto mapping system of submarine topography and geomorphology MBChart".This method and program will possibly become a potential tool to calculate the resources of seamounts and determine the target diggings for China's next Five-year Plan.  相似文献   

胶州湾围隔浮游生态系统氮、磷营养盐迁移-转化模型研究   总被引：2，自引：1，他引：2       下载免费PDF全文

李克强  王修林  石晓勇  祝陈坚  李瑞香 《海洋学报》2007,29(3):76-83

通过对目前生态动力学模型的总结和综合,以生态系统中氮、磷营养盐循环为主线,建立了适用于海洋围隔浮游生态系统的多变量的营养盐迁移-转化动力学模型.该模型包括浮游植物、浮游动物、溶解无机态营养盐、溶解有机态营养盐和生物碎屑5个模块,涉及溶解无机氮、磷酸盐、溶解有机氮、溶解有机磷、浮游植物、浮游动物和生物碎屑7个状态变量.分别利用1999年秋季和2000年夏季胶州湾围隔生态实验数据进行了模型和验证工作,成功地模拟了富加营养盐条件下围隔浮游生态系统中氮、磷营养盐生物化学迁移-转化过程,并确定了20余个参数的量值.  相似文献   

Numerical simulation of solitary wave scattering by a circular cylinder array   总被引：1，自引：0，他引：1  

Ming Zhao  Liang Cheng  Bin Teng 《Ocean Engineering》2007,34(3-4):489-499

The interaction of a solitary wave with an array of surface-piercing vertical circular cylinders is investigated numerically. The wave motion is modeled by a set of generalized Boussinesq equations. The governing equations are discretized using a finite element method. The numerical model is validated against the experimental data of solitary wave reflection from a vertical wall and solitary wave scattering by a vertical circular cylinder respectively. The predicted wave surface elevation and the wave forces on the cylinder agree well with the experimental data. The numerical model is then employed to study solitary wave scattering by arrays of two circular cylinders and four circular cylinders respectively. The effect of wave direction on the wave forces and the wave runup on the cylinders is quantified.  相似文献   

渤、黄、东海底摩擦系数的研究     

孙丽艳  吕咸青 《海洋湖沼通报》2007,(2):7-12

本文将伴随法用于渤、黄、东海M2分潮的数值模拟,利用Topex／Poseidon高度计资料进行同化,优化海底摩擦系数。文中对底摩擦系数取常数时进行了优化,同时还对底摩擦系数的一种新的处理方法进行了研究,即在计算海区选取一些点给定底摩擦系数,海区中任意一点的底摩擦系数由这些点的底摩擦系数线性播值得到,优化后得到空间分布的底摩擦系数。针对两种不同的线性底摩擦假设分别进行了一系列的实际实验,结果表明由空间分布的底摩擦系数得到的模拟值比底摩擦系数取常数得到的模拟值更接近观测值,能有效地提高数值模拟的精度。  相似文献   

Numerical simulation of the hydrodynamic behaviour of submerged plane nets in current     

Yu-Cheng Li  Yun-Peng Zhao  Fu-Kun Gui  Bin Teng 《Ocean Engineering》2006,33(17-18):2352-2368

The aim of this paper is to investigate the shape and tension distribution of fishing nets in current. A numerical model is developed, based on lumped mass method to simplify the net. The motion equation is set up for each lumped mass. The Runge–Kutta–Verner fifth-order and sixth-order method is used to solve these simultaneous equations, and then the displacement and tension of each lumped mass are obtained. In order to verify the validity of the numerical method, model tests have been carried out. The results by the numerical simulation agree well with the experimental data.  相似文献