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71.
自1996年江苏省实施“海上苏东”战略以来,南通市海洋经济以年均16%以上的增长率迅速发展,至2004年,全市海洋经济总产值达到226亿元,海洋经济已成为南通市国民经济发展的一条亮丽的风景线。然而,当前全市海洋经济占比达43.6%的海洋渔业经济遭受了极大挑战。2004年,南通市海洋渔业两大主导产品——条斑紫菜与文蛤同期发生重大病灾,造成经济损失1亿余元。群发性上访等事件给整个社会带来了诸多不稳定因素,海洋渔业经济的管理也陷入了被动应付的困境。引发紫菜与文蛤重大病灾的因子较多,海洋生态环境恶化是其中一个极为重要的因素。面对海洋渔… 相似文献
72.
73.
研究扇贝外套腔内栖生的纤毛虫一蠕状康纤虫Cohnilembusverminus(Muller,1786)的形态、核器及纤毛图式。结果显示其口器结构为;M1呈单列结构,约占体长的1/2,M2由4组毛基粒构成,PM起自M2末端,Sc约由5个毛基粒构成。此外,还列表比较了不同作者报导的C.verminus种群及其它6种已知的康纤虫的主要性状特征。 相似文献
74.
Tan Jiahua Ma Wei Pan Bin Associate Professor Shanghai Jiao Tong University Shanghai Lecturer shanghai Jiao Tong University Shanghai 《中国海洋工程》1992,(1)
The basis, process and results of the demonstration of the main dimensions of a 75000t floating production and storage vessel are discussed in this paper. A simple but reliable orthogonal design method is applied in the main dimension optimization. The ideas of gradual approximation and feedback from various aspects are put into effect. During the demonstration, in order to make the model tally with the actual situation, the draft design is closely related to the computational analysis, so that the demonstration model can be verified at any time; the handling of the overall system is closely related to the research of each item, which is beneficial not only to the mastery of various regularities, but also to the balance of decisions. Finally, according to the computational results and the regularities obtained from analysis, the main dimensions are determined. 相似文献
75.
Lian Gan Ni Kan Hu Kai Guo Dawei . Professor Senior Engineer Marine Design & Research Institute of China Shanghai
. Senior Engineer Marine Design & REsearch Institute of China Shanghai
. Engineer Marine Design & Research Institute of China Shanghai 《中国海洋工程》1992,(4)
This paper describes the study of a single-column structure used as well-head platform. In order to check the reliability of computation theory and programme, model tests have been carried out. The paper introduces the conclusion of tests and the dynamic properties of single-column platform are obtained. 相似文献
76.
The incompressible viscous uniform and shear flow past a circular cylinder is studied. The two-dimensional Navier-Stokes equations are solved by a finite element method. The governing equations are discretized by a weighted residual method in space. The stable three-step scheme is applied to the momentum equations in the time integration. The numerical model is firstly applied to the computation of the lid-driven cavity flow for its validation. The computed results agree well with the measured data and other numerical results. Then, it is used to simulate the viscous uniform and shear flow over a circular cylinder for Reynolds numbers from lO0 to lO00. The transient time interval before the vortex shedding occurs is shortened considerably by introduction of artificial perturbation. The computed Strouhal number, drag and lift coefficients agree well with the experimental data. The computation shows that the finite element model can be successfully applied to the viscous flow problem. 相似文献
77.
众所周知,ENSO(El Nino/ Southern Oscillation)是发生在热带太平洋的年际时间尺度上最强的气候信号,与 El Nino (La Nina)相应的正(负)海温距平(SSTA)主要分布于赤道中东太平洋地区(Rasmusson et al.,1982)。相对于热带太平洋的年际ENSO现象,人们注意到北太平洋海平面气压(SLP)存在更长周期的年代际变化(Trenberth et al.,1994),有人认为这与北太平洋的表层温度(SST)变化有关(Latif et al.,1994),也有人认为与热带SST的异常关系更为密切(Jacobs et al.,1994)。20世纪80年代后的ENSO事件和20世纪60,70年代有明显的差别(Wang,1995),20世纪90年后El Nino发生频数增加,并且在1997和1998年出现了20世纪最强的一次Nino事件(McPhaden,1999)。
因此,不论是作为大气年代际变化可能的一个驱动因子,还是作为年际ENSO的背景场,从整体上了解太平洋SST的年代际时间尺度上的时、空变化特征都是十分重要的。 相似文献
78.
AbstractBased on hydrological data obtained during the 7th to 9th Chinese National Arctic Research Expeditions in the summers of 2016–2018, the main water structure on the shelf of the northern Bering Sea and the volume and heat fluxes of the Bering Strait throughflow were analyzed. Distinct variability was identified in the three Pacific water masses feeding the strait - Anadyr Water (AW), Bering Shelf Water (BSW) and Alaskan coastal water (ACW). Overall, the temperature and salinity of the entire section increased each year, with 2018 showing significant anomalies, i.e., a temperature anomaly of up to 1?°C and a maximum salinity anomaly of 2. From 2016 to 2018, the extent of the ACW gradually narrowed in the eastern part of this section, while the AW expanded eastward each year. The net volume transport through each of the three sections increased poleward from 1.65?Sv to 2.76?Sv, with the AW increasing from 0?Sv to 1.03?Sv, the BSW varying between 0.52–1.65?Sv, and the ACW gradually decreasing from 1.04?Sv to disappearing completely. The net heat fluxes were also poleward, varying between 25.77 TW and 61.50 TW, and showing a significant increase. Significant variations in magnitude and extent were observed in each water mass of the Bering Strait throughflow, which could produce widespread effects in the Arctic Ocean and the global ocean beyond. 相似文献
79.
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
80.
海浪数值模式研究回顾与进展 总被引:1,自引:1,他引:1
本文简单介绍了海浪的生成、发展理论,以及海浪数值模式的分类;回顾总结了国内外在海浪数值模式研究方面取得的成果。 相似文献