Comparison of methods for computing hydrodynamic characteristics of arrays of wave power devices     

S. A. Mavrakos  P. McIver 《Applied Ocean Research》1997,19(5-6):283-291

A comparison of methods for the calculation of the hydrodynamic characteristics of arrays of wave power devices is presented. In particular, the plane-wave approximation and an exact multiple scattering formulation have been used to compute exciting wave forces, hydrodynamic coefficients and q factors for arrays of interacting wave power devices. The results obtained are compared with each other, and accuracy aspects of the computations are stressed and critically assessed.  相似文献   

旋转谱理论探讨     

刘玉光  余宙文 《中国海洋大学学报(自然科学版)》1988,(4)

本文应用向量随机过程分解模型对旋转谱作出物理解释;此外,还修改了线性振荡度的定义,导出了极化度、线性振荡度和旋转系数之间的关系式,并讨论了它们与总相干、同相相干、异相相干之间的关系。  相似文献   

PSEUDO-STATIC ANALYSIS FOR DYNAMIC DEFORMATION BEHAVIORS OF OFFSHORE GRAVITY PLATFORM FOUNDATIONS     

曹亚林  章守恭  何广讷 《海洋学报(英文版)》1987,6(2):304-310

Based on the analysis of cyclic triaxial test for the South-Sea sand, a comprehensive normalized model of soil stress-strain relationship is presented herein, which includes effects of not only initial stress states but also loading cycles. Consequently, a pseudo-static procedure to analyse the deformation behavior of foundations is suggested. Example of calculations shows that the suggested procedure is convenient in application.  相似文献   

The impact of wave loads and pore-water pressure generation on initiation of sediment transport   总被引：3，自引：0，他引：3  

Edward C. Clukey  Fred H. Kulhawy  Philip L. -F. Liu  George B. Tate 《Geo-Marine Letters》1985,5(3):177-183

The build-up of pore-water pressure by waves can lead to sediment liquefaction and subsequent transport by traction currents. This process was investigated by measuring pore-water pressures both in a field experiment and laboratory wave tank tests. Liquefaction was observed in the wave tank tests. The results suggest that sand is less susceptible than silts to wave-induced liquefaction because of the tendency to partially dissipate pore-water pressures. However, previous studies have determined that pore-water pressures must approach liquefaction before current velocities necessary to initiate transport are reduced. Once liquefaction has occurred more sediment can be transported.  相似文献   

Numerical modelling of the sea level under the actions of the tide and strong wind in the Bohai Sea     

Zhang Yanting  Wang Yijiao 《海洋学报(英文版)》1989,8(4):511-520

In this paper, the numerical modelling of the tidal level and current in the Bohai Sea was carried out with ADI method, by taking the sum of four main tidal components M2,S2K2,O1 as the open boundary condition. The calculated values were consistent with the predicted ones (the observed values in the case of calm) in the Tidal Table. On the basis of the modelling of the tide, the sea level and current fields under the effects of strong wind were simulated. The calculated results were also quite satisfactory.  相似文献   

非线性共轭梯度法在东海黑潮流计算中的应用   总被引：4，自引：0，他引：4  

陈红霞  袁业立  刘娜  曲媛媛 《海洋学报》2003,25(6):31-38

基于现有的几种海流计算方法,根据与P矢量法相同的动力特性和内在假设,对海流计算提出了一种简单、高效、易扩展、适用范围广的新方法:非线性共轭梯度法.利用1989年4月以来的"中日黑潮合作调查研究"6个航次的CTD资料,对东海黑潮流区域应用非线性共轭梯度法进行了海流计算.通过与船载ADCP实测结果比较表明,非线性共轭梯度法是可行的.  相似文献   

Study on genetic diversity of cultivated populations in 4 species of shrimps   总被引：2，自引：0，他引：2  

Li Zhongbao  Wu Zhongqing 《海洋学报(英文版)》2003,22(1):97-101

Genetic diversity of cultivated populations was investigated using assay of vertical slabpolyacrylamide gel electrophoresis in 4 species of shrimps, which were Penaeus japonicus, Penaeus monodon , Penaeus vannamei and Metapenaeus ensis, The results showed that the mean number of alle-les per locus (A) is 1.3±0.2, 1.3±0.1, 1.3±0.1 and 1.3 ±0.1 respectively; the percentage of polymorphic loci (P0.95) is 12.5, 6.7, 20 and 23.5 respectively; the expected heterozygosity (He) is 0.042±0.034,0.042±0.031, 0.094±0.042 and 0.097±0.047 respectively; and the observed heterozygosity (H0)is 0.029±0.024, 0.028±0.023,0.154±0.082 and 0.150±0.084 respectively. The difference of genetic diversity is obvious in 4 species of shrimps. The degree of genetic diversity is M. ensis > P. vannamei > P. japonicus > P. monodon. In short, the lower level of genetic diversity is estimated in 4 species of shrimps.  相似文献   

雷州半岛灯楼角海岸地貌演变   总被引：10，自引：0，他引：10  

王丽荣  赵焕庭  宋朝景  袁家义  于红兵 《海洋学报》2002,24(6):135-144

灯楼角岬角位于雷州半岛的西南端,地处热带北缘.过去几次开展的区域地貌和第四纪地质调查及制图,均包括本区1),2),[1～2].宋朝景曾做过涉及本区海底的地貌与浅地层调查3),又指导学生研究本段海岸地貌4).近年赵焕庭等[3]开展该区珊瑚礁研究,使用了1960年版航空照片和1964年版1:10000地形图,结合野外调查,进一步研究了本区海岸地貌的演变.  相似文献   

1994年发生在台湾海峡的一次地震海啸的数值模拟   总被引：19，自引：0，他引：19  

于福江  叶琳  王喜年 《海洋学报》2001,23(6):32-39

建立了一个地震海啸数值模式,模式包含越洋海啸传播部分和近岸海啸变形部分,在越洋海啸传播部分中采用线性浅水方程,使用蛙跃格式求解,并且选择合适的空间步长与时间步长,使差分格式中产生的数值频散与包辛尼斯克方程中的物理频散一致,这样在不影响海啸数值计算精度的前提下,节省了计算机的机时与内存.在近岸海啸变形部分的计算中,考虑了非线性对流项与海底摩擦项.同时该模式采用了多重网格嵌套技术,提高了所关心地区的计算精度.利用这个地震海啸模式模拟了1994年发生在台湾海峡的一次地震海啸,结果与观测记录较吻合.这个模型已用于我国沿海核电站可能最大地震海啸的数值计算.  相似文献   

一种改进的膜盐度计   总被引：1，自引：0，他引：1       下载免费PDF全文

陈国华  王立红  张力军  关庆利 《海洋科学》1993,17(5):54-58

叙述了一种可用于现场及实验室使用的新的浸入式电池膜盐度计的设计与结构。该膜盐度计传感器由下列电化学电池组成,用此传感器与微机或pH/离子计配合组成了膜盐度计。该仪器可用于近岸河口地区表层海水盐度监测并用于有潮河口底栖动物生态现场研究。仪器现场条件使用准确度约为盐度测量值1％。同时能用于Cl~-及其他离子的现场监测。  相似文献