大气垂直速度计算中校正方法的探讨     

沈雪龙 《海洋学研究》1997,15(4):24-28

本文对大气运动中垂直速度ｗ计算中的几种校正方法作了分析比较，并在前人工作的基础上，对校正方法作了改进，提出了进行低通滤波、散度校正和法线风分量校正的方法。通过这些校正，使计算出的平均散度和垂直速度的垂直廓线能维持原计算曲线的形式，并能满足整个气层连续方程积分为零的条件，也符合误差随高度增大的情况。  相似文献   

Wave Decay and Its Characteristics in Surf Zone     

Gu Jialong Shen Xianrong Professor  Hohai University  Nanjing Engineer  The Investigation  Design Institute  Bureau of Communications of Zhejiang Province  Hangzhou 《中国海洋工程》1991,(2)

In accordance with the similarity between breaking waves and hydraulic jumps, the expressions for estimating wave decay and wave energy dissipation in the surf zone are derived based on the fundamental equations of fluid mechanics. Using the numerical solution of cnoidal wave theory, the various kinematic properties of waves in the surf zone, including the relative wave crest height, wave energy, and radiation stress are discussed. The values calculated with the method proposed in this paper are in good agreement with the experimental data gained by other researchers. The present expressions can be used in the studies of sediment transport on gently sloping beaches, especially on muddy beaches.  相似文献   

On the long-term joint distribution of characteristic wave height and period and its application     

Fang Zhongsheng  Dai Shunsun  Jin Chengyi 《海洋学报(英文版)》1989,8(3):315-325

By analysing the scatter diagrams of characteristic the wave height H and the period T on the basis of instrumental data from various ocean wave stations, we found that the conditional expectation and standard deviation of wave period for a given wave height can be better predicted by using the equations of normal linear regression rather than by those based on the log- normal law. The latter was implied in Ochi' s bivariate log-normal model(Ochi. 1978) for the long-term joint distribution of H and T. With the expectation and standard deviation predicted by the normal linear regression equations and applying proper types of distribution, we have obtained the conditional distribution of T for given H. Then combining this conditional P(T / H) with long-term marginal distribution of the wave height P(H) we establish a new parameterized model for the long-term joint distribution P(H,T). As an example of the application of the new model we give a method for estimating wave period associated with an extreme w  相似文献   

凡纳滨对虾生物学及养殖生态学研究进展   总被引：32，自引：0，他引：32  

王兴强  马甡  董双林 《海洋湖沼通报》2004,(4):94-100

凡纳滨对虾原产于太平洋沿岸水域秘鲁北部至墨西哥桑诺拉一带。1988年由张伟权教授引进我国。本文对国内外凡纳滨对虾生物学及养殖生态学的研究进行了总结，提出了凡纳滨对虾养殖生态学今后研究的方向。  相似文献   

潮汐分析和预报的准调和分潮方法 Ⅱ.短期观测的分析     

方国洪 《海洋科学集刊》1976,(11):33-56

目前,调和方法仍然是潮汐的分析和预报中的一种主要的基本方法,其关键在于求得尽可能准确的调和常数。在湖汐分析中,经常遇到的是对于中、长期(半个月以上)记录的处理,对于这样的资料,已有许多良好的分析方法可以采用。但是,有时我们也会遇到需要处理的短期观测资料,特别对于潮流,由于对它进行观测比水位观测要困难,常常不能获得较长期的记录,而需要从短期记录中分析出调和常数来。处理短期记录的方法也有不少,其中较为常用的是英国海军部的几种方法。这些方法只能处理一次或二次周日观测记录,当观测天数较多时,只能分组进行计算得到几组调和常数,然后再求平均值由于各组的天文条件的差別,调和常数的准确度常常有相当大的差异,而计算平均值时却没有加权,这就影响了结果的可靠性。本文建议的方法将可以直接分析任意多次周日观测记录,因而简化了计算并能得到更准确的结果。  相似文献   

Dynamic Response Analysis of Interaction System of R.C. Gravity Single-Leg Platform     

Cao Guoao Shen Yilei Dr.Professor  Tongji University  Shanghai Shanghai College of Architectural  Municipal Engineering  Shanghai 《中国海洋工程》1991,(1)

In this paper, the responses of the interaction system of R.C. gravity single-leg platform to seismic excitation are mainly analysed. A set of nonlinear equations for the interaction system are established by using the wave, one is the soil-structure interaction and the other is the fluid-structure interaction. The seismic response of the interaction system is analysed for the influence of the asymmetric structure, fluid action, etc. with the input of seismic SH waves in any direction. The numerical results are given for a simple example.  相似文献   

文昌鱼哈氏窝匀浆使蟾蜍足细胞释精的超微结构研究     

方永强  王龙 《台湾海峡》1991,(1)

本文报道了文昌鱼哈氏窝匀浆刺激蟾蜍足细胞释放精子过程所发生的超微结构变化,进一步证实这种匀浆含有类似脊椎动物促黄体生成素活性物质。  相似文献   

Studies on ultrastructure of oocyte in process of maturing in pen shell     

Fang Yongqiang  Qi Xiang 《海洋学报(英文版)》1988,7(3):459-472

The present paper deals with the ultrastructural changes of oocyte in the process of maturing in pen shell Atrinapectinata Linne. When it develops from the antecedent growth period to the accelerating growth period the annulate lamellae emerge, the RER better develop, the yolk granules with single and double layer membrane and are visible. In the well-developed mitochondria there is yolk stored. The Golgi vacuoles are brewing yolk granules. At the mature period the annulate lamellae and the Golgi bodies disappear, and there are only a few RER and mitochondria with poor cristae in the cytoplasm. All these might be well used for judging the maturity of the ootids in the process of the artificial propagation.  相似文献   

Study of zooplankton ecology in Zhejiang coastal upwelling system-Zooplankton biomass and abundance of major groups   总被引：1，自引：0，他引：1  

He Dehu  Yang Guanming  Fang Shaojin  Shen Weilin  Liu Hongbin  Gao Aigen  Huang Shuxin 《海洋学报(英文版)》1988,7(4):607-620

The studied area is a shallow water area that belongs to the East China Sea continent shelf. The distribution of zooplankton biomass is higher inshore than offshore. The maximum abundance is in the inshore edge of the centre of upwelling, which is the superposed area of the salinity front and temperature front, due to the fact that the mixture of three different waters has brought about a concentration of nutrients. The herbivorous Euphausia, Copepoda and Tunicata are the major groups of the abundant area. Tunicata possess the possibility to compete against other kinds of herbivorous zooplankton. This means that there is negative correlation between the distribution of Tunicata and that of Copepoda and Euphausia. The positions of maximum areas of zooplankton biomass, phytoplankton individual and the concentration of phosphates and chlorophyll-a overlap one another. In the centre of upwelling, zooplankton can not adapt itself to the environment of lower temperature and less oxygen even with rich nutrient  相似文献   

海带的一个自然突变型   总被引：1，自引：0，他引：1  

方宗熙  欧毓麟  崔竞进 《海洋学报》1982,4(2):201-208

在多细胞藻的遗传学研究中,被发现的突变型很少[1].绿藻中有一些突变型,其中较多的是某种石莼(Ulva mutabilis)[2].三浦昭雄等在紫菜中发现突变型.在褐藻中未见有突变型的报道.这里所报道的是海带(Laminaria japonica)的一个突变型.  相似文献