Internal generation of waves: Delta source function method and source term addition method     

Gunwoo Kim  Changhoon Lee  Kyung-Duck Suh   《Ocean Engineering》2007,34(17-18):2251-2264

In this study, we investigate two internal wave generation methods in numerical modeling of time-dependent equations for water wave propagation, i.e., delta source function method and source term addition method, the latter of which has been called the line source method in literatures. We derive delta source functions for the Boussinesq-type equations and extended mild-slope equations. By applying the fractional step splitting method, we show that the delta source function method is equivalent to the source term addition method employing the energy velocity. This suggests that the energy velocity should be used rather than the phase velocity for the transport of incident wave energy in the source term addition method. Finally, the performance of the delta source function method is verified by accurately generating nonlinear cnoidal waves as well as linear waves for horizontally one-dimensional cases.  相似文献   

Generation of random waves in time-dependent extended mild-slope equations using a source function method     

Gunwoo Kim  Changhoon Lee  Kyung-Duck Suh   《Ocean Engineering》2006,33(14-15):2047-2066

We develop techniques of numerical wave generation in the time-dependent extended mild-slope equations of Suh et al. [1997. Time-dependent equations for wave propagation on rapidly varying topography. Coastal Engineering 32, 91–117] and Lee et al. [2003. Extended mild-slope equation for random waves. Coastal Engineering 48, 277–287] for random waves using a source function method. Numerical results for both regular and irregular waves in one and two horizontal dimensions show that the wave heights and the frequency spectra are properly reproduced. The waves that pass through the wave generation region do not cause any numerical disturbances, showing usefulness of the source function method in avoiding re-reflection problems at the offshore boundary.  相似文献   

海洋沉积物声速与物理参数的关系   总被引：4，自引：0，他引：4       下载免费PDF全文

卢博  梁元博 《海洋科学》1993,17(6):54-57

海洋沉积声速与物理性质密切相关，特别是含水量Ｗ和孔隙度Ｎ，它们在建立回归议程和预报沉积物性质中有所贡献。中国东，南海沿海沉积物的资料和数据表明：声速和声速比可以用来预报沉积物性质。  相似文献   

Community and Population Responses of the Macroinfauna to Physical Factors over a Range of Exposed Sandy Beaches in South-central Chile     

Eduardo Jaramillo  Anton McLachlan 《Estuarine, Coastal and Shelf Science》1993,37(6)

Ten exposed sandy sites covering a range from reflective to dissipative beaches were sampled in south-central Chile to evaluate: (1) spatial changes in species richness, abundance and biomass of the intertidal macroinfauna in response to changes in mean grain size, beach face slope and beach type, and (2) spatial changes in abundance, biomass and body sizes of the most abundant species in response to changes in the physical factors. The number of species, abundance and biomass per beach in general decreased with increasing particle size and beach face slope (steeper beaches) and increased from reflective to dissipative conditions. The best fit for number of species was with Dean's parameter, a measure of beach type, whereas for abundance and biomass the best fits were found with particle size. The isopod Excirolana braziliensis and the anomuran Emerita analoga increased in abundance and biomass towards dissipative conditions, whereas Excirolana hirsuticauda showed the opposite trend in biomass and was significantly larger in beaches with steeper profiles. It is concluded that responses to changes in beach type are more pronounced at community level than within species populations.  相似文献   

台湾浅滩西部水域海洋动物的石油烃含量和荧光光谱特征     

贾晓平  林钦  吕晓瑜  宗志伦 《台湾海峡》1990,(3)

本文报道了台湾浅滩西部水域鱼类、虾类和软体头足类动物的总石油烃含量,分析了主3类动物样品的荧光光谱特征,并将本文数据与南海其他水域海洋动物的石油烃含量作了比较。  相似文献   

JONSWAP谱和N谱的几个对应特征量间的关系     

施平  郭佩芳 《海洋与湖沼》1996,27(6):605-611

研究了风浪频谱ＪＯＮＳＷＡＰ谱的峰度因子γ、尖度因子Ｐｊ和Ｎ谱尖度因子ＰＮ，参变量ｐ，ｑ间的关系；并在此关系上给出了由这两种谱计算的几个对应参量间的关系，在使用不同的谱形进行特征量的计算时，应注意不同频谱间的成长因子致性，以免引起计算结果的错误。  相似文献   

The wave transformation and breaking phenomena in shallow water     

Li Yucheng 《海洋学报(英文版)》1996,15(2):261-272

Ｔｈｅｗａｖｅｔｒａｎｓｆｏｒｍａｔｉｏｎａｎｄｂｒｅａｋｉｎｇｐｈｅｎｏｍｅｎａｉｎｓｈａｌｌｏｗｗａｔｅｒ￥ＬｉＹｕｃｈｅｎｇ（１．ＤａｌｉａｎＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｎｏｌｏｇｙ，Ｄａｌｉａｎ１１６０２３，Ｃｈｉｎａ）Ａｂｓｔｒａｃｔ：...  相似文献   

风浪频谱中的特征量   总被引：4，自引：3，他引：4       下载免费PDF全文

侯一筠  王涛 《海洋与湖沼》1993,24(2):126-131

在三参量风浪频谱的基础上对谱参量进行深入地研究,给出了谱参量与风场要素、波场要素的关系,提供了依据风场要素、波场要素及实测波浪资料计算谱参量的方法。从而可以依据上述因素直接计算出三参量风浪频谱。此外还根据谱宽度的变化,描述了风浪频谱的成长方式,解释了传统的波陡、波龄关系中经验常数的不同选取所代表的物理背景。  相似文献   

中国近海鱼类生活史型与生态学参数地理变异   总被引：11，自引：0，他引：11  

罗秉征 《海洋与湖沼》1992,23(1):63-73

根据1985－1986年东海北部近海调查材料及其它有关文献，对43种鱼计74个种群或群体的生活史选择型及其生态参数进行了比较研究。结果表明，分布于我国近海的主要鱼类大多偏于r选择型。对r－K选择鱼种的资源特征及其对捕捞的反应作了阐述。各鱼种的种群生态学参数在种间和空间分布均表现出地理变异。  相似文献   

Towards the identification of warning criteria: Analysis of a ship accident database   总被引：3，自引：0，他引：3  

A. Toffoli  J.M. Lefvre  E. Bitner-Gregersen  J. Monbaliu 《Applied Ocean Research》2005,27(6):281-291

  相似文献