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1.
On the basis of perennial monthly mean temperature and salinity data, the classification of monthly water masses at the surface and the bottom in the Bohai Sea, the Huanghai Sea and the East China Sea, has been made by using the method of fuzzy cluster from the modified characteristic of water masses in the shallow water area. In this paper, the basic features, growth and decline patterns of water masses in relation to fishing grounds in the whole shelves of the Bohai Sea, the Huanghai Sea and the East China Sea are discussed with emphasis. 相似文献
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In this paper, the principle and steps for differentiating water masses by fuzzy cluster method are introduced, and a scalar formula bsed on Euclidean distance and a method for determining objectively the number of water masses by F-test are proposed. Consequently, a method and specific steps for differentiating modified water masses in shallow sea according to fuzzy elastic classification are given. Computation of the membership degree in which each sample belongs to every water mass determines conveniently and quantitatively the cores, boundaries of water masses and mixed zones. An example for the Huanghai Sea and East China Sea is shown and compared with previous results. 相似文献
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提出不受资料输入顺序影响的模糊密度聚类法。给出模糊点密度的定义与计算方法,并用渤、黄、东海的温盐资料,进行模糊密度聚类计算,对聚类结果及水团划分进行了讨论。 相似文献
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In this paper, the principle and steps for differentiating water masses by fuzzy cluster method are introduced, and a scalar formula based on Euclidean distance and a method for determining objectively the number of water masses by F-test are proposed. Consequently, a method and specific steps for differentiating modified water masses in shallow sea according to fuzzy elastic classification are given. Computation of the membership degree in which each sample belongs to every water mass determines conveniently and quantitatively the cores, boundaries of water masses and mixed zones. An example for the Huanghai Sea and East China Sea is shown and compared with previous results. 相似文献
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使用1987年5～6月黄、东海的调查资料,在水团多元模糊划分的基础上,引入了使用隶属函数的模糊判别分析,对海域中的11个水团模糊划分的有效性,给出了合理的判别方法,使水团的模糊分析增添了新的内容,得到了一些有益的结论。同时,简要地分析了各水团的分布与特征。 相似文献
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-In this paper,by using ISODATA of fuzzy cluster,the water masses classification of the upper layer in the E-quatorial Western Pacific is carried out. On the basis of the degree of the membership in the obtained optima) classification matrix, the solid distribution of the detailed structure of water masses is made. The water of the upper layer,consisting of six water masses,may be divided into three layers,i, e. ,the surface,subsurface and intermediate layer. Besides analyzing the features of various water masses,a discussion on their distribution structure and formation mechanism is also made. 相似文献
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1998年夏、冬季南海水团分析 总被引：15，自引：2，他引：15
为了解南海水团的特征和分布 ,基于 1 998年夏季和冬季两个航次的实测资料 ,采用聚类分析、判别分析和模糊分析方法 ,对南海的水团进行了分析。结果表明 ,南海外海水可划分为 6个水团 ,即南海表层水团、南海次表层水团、南海次 中层混合水团、南海中层水团、南海深层水团和南海底盆水。越南附近夏季存在一个暖涡 ;1 998年夏季还可鉴别出黑潮表层水团和黑潮次表层水团 ,但在冬季观测期间无黑潮水越过 1 1 9.5°E经线进入南海 ;这些现象可能与厄尔尼诺现象有关联。夏季有苏禄海海水在 5 0— 75m层经由民都洛海峡侵入南海 相似文献
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用模糊集合观点讨论水团的有关概念 总被引：1，自引：0，他引：1
本文将划分水团的基本原则,概括为水团内部特征的相对均一性及其与外部海水的明显差异性。用模糊集合讨论了水型、水团和水系等有关概念。提出了用模糊集合观点定义水团及其核心、本体、边界与混合区的建议,并以1979年8月黄海和东海表层为例,给出了各水团的隶属函数。计算了其核心、本体、边界、混合区及贴近度,按其模糊性排出了顺序。 相似文献
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黄、东海域春季水团的模糊分析 总被引：2，自引：2，他引：2
本文对黄、东海毗连海域1987年春季的水团,用模糊数学方法进行了系统的分析。在聚类分析和判别分析的基础上,对各水团的点集进行必要的处理,分别建立它们的隶属函数。根据隶属度的分析,用图示给出各水团的核心、本体和边界。本文还计算了各水团的熵以及水团之间的贴近度。据此划分水系,分析它们之间的逐级变性与相互关系,取得了满意的结论。 相似文献
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The fundamental principle for differentiating water masses is a strict consideration of their relative "interior homogeneity" and obvious "exterior differences" with others in characteristics. The conceptions of water type, water mass and water system are dealt with on the basis of the theory of fuzzy sets. A proposal to apply the theory of fuzzy sets to define the water mass and its core, independent area, boundary and mixing area is put forward.As an example, the membership function of the surface water masses in the Yellow Sea and East China Sea in August, 1979, are considered. Their cores, independent areas, boundaries, mixing areas and the approximation degrees between different water masses are calculated respectively. The water masses are ranged according to their fuzzy degrees. 相似文献
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南海北部海区水团分析 总被引：1，自引：0，他引：1
以模糊聚类为主要方法,在南海北部海区划出8个水团:沿岸冲淡水团(F)、近岸混合水团(M)、暖表层水团(WS)、表层水团(S)、表-次层混合水团(SU)、次层水团(U)、次-中层混合水团(UI)和中层水团(I).对各水团的形成、基本特征、变性特点以及消长变化和分布规律进行了综合分析.可将它们分为3种类型:径流冲淡型——F,浅海变性型——M、WS、S、SU和深海大洋型——U、UI和I. 相似文献
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舟山渔场及其邻近海域水团的季节特征 总被引：5，自引：0，他引：5
根据2001年夏季和2002年冬季两次现场调查所收集的CTD和营养盐资料,利用模糊聚类分析法,对舟山渔场及其邻近海域水团的季节特征进行了分析.结果表明,舟山渔场及其邻近海域水团的配置、分布范围、温盐特性和营养盐含量都有明显的季节特征.其中,冬季在全海域共有3个水团(江浙沿岸水、台湾暖流表层水和黄海混合水),而夏季则存在4个水团(江浙沿岸水、台湾暖流表层水、台湾暖流深层水和黄海混合水);冬季,江浙沿岸水的分布范围较小,温度偏低,盐度略高,营养盐偏高,而夏季,其分布范围较大,温度偏高,盐度偏低,营养盐偏低;冬季,台湾暖流表层水北伸最强,厚度最厚,温度最低,盐度最高,硅酸盐和硝酸盐偏高,而夏季,则北伸最弱,厚度最薄,温度最高,盐度最低,硅酸盐和硝酸盐偏低;台湾暖流深层水是一个季节性水团,它含有较丰富的营养盐;黄海混合水的分布范围和营养盐含量也都呈现出明显的季节特征. 相似文献
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变性水团软划分的一种FUZZY模式 总被引：1，自引：0，他引：1
在已知研究海区水团核心的前提下,考虑到各种指标对标识水团的不同贡献,提出了一种水团软划分的FUZZY模式。利用1987年5—6月黄东海的温、盐和溶解氧实测资料进行计算,与已有成果作了对比,结果令人满意。 相似文献
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Using the fuzzy clustering as the principal method, eight water masses in the northern South China Sea (NSCS) are distinguished. They are Alongshore Diluted Water Mass (F), Nearshore Mixed Water Mass (M), Warm Surface Water Mass(WS), Surface Water Mass(S), Surface-Subsurface Mixed Water Mass(SU), Subsurface Water Mass (U), Subsurface-Intermediate Water Mass (UI) and Intermediate Water Mass (1). A synthertic study is made on the formations, basic properties and modified characters of each water mass and the regularities of their disributions and growth and decline variations . They may be classified into three types; the type of runoff-diluted water (F). the type of shallow sea-modified water (M, WS. S. and SU) and the type of deep sea-oceanic water (U, UI, and I). 相似文献
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将研究海区中的水团,视为论域中的模糊子集。用关于海水中保守浓度的混合理论,来讨论水团在混合变性过程中隶属函数的可能形式,可为变性水团隶属函数建立提供依据。本文的结果可推广应用于浅海,文中给出了实例和讨论。 相似文献
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INVESTIGATION ON MAKING MEMBERSHIP FUNCTION OF WATER MASS FROM MIXING MODIFIED PROCESS 总被引：1，自引：0，他引：1
A water mass in the sea area under investigation is defined as a fuzzy subset in the discourse universe. Possible forms of membership function of water masses in the mixing modified process are discussed with the mixing theory for conservative concentration of sea water. It may provide bases for making membership functions. Results in this paper may be extended and applied to shallow water. Examples and discussion are given in (his paper. 相似文献
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A water mass in the sea area under investigation is defined as a fuzzy subset in the discourse universe. Possible forms of membership function of water masses in the mixing modified process are discussed with the mixing theory for conservative concentration of sea water. It may provide bases for making membership functions. Results in this paper may be extended and applied to shallow water. Examples and discussion are given in this paper. 相似文献
20.
Water masses in the subsurface and the intermediate layer are actively formed due to strong winter convection in the Japan
Sea. It is probable that some fraction of pollution is carried into the layer below the sea surface together with these water
masses, so it is important to estimate the formation rate and turnover time of water masses to study the fate of pollutants.
The present study estimates the annual formation rate and the turnover time of water masses using a three-dimensional ocean
circulation model and a particle chasing method. The total annual formation rate of water masses below the sea surface amounted
to about 3.53 ± 0.55 Sv in the Japan Sea. Regarding representative intermediate water masses, the annual formation rate of
the Upper portion of the Japan Sea Proper Water (UJSPW) and the Japan Sea Intermediate Water (JSIW) were estimated to be about
0.38 ± 0.11 and 1.43 ± 0.16 Sv, respectively, although there was little evidence of the formation of deeper water masses below
a depth of about 1500 m in a numerical experiment. An estimate of turnover time shows that the UJSPW and the JSIW circulate
in the intermediate layer of the Japan Sea with timescales of about 22.1 and 2.2 years, respectively. 相似文献