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 ...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.展开更多
This paper uses the hydrographic date obtained during the springs from 1960to 1980 with the temperature and salinty as the major indexes. By combining the method of the chustering analysis which approaches T-S diagram...This paper uses the hydrographic date obtained during the springs from 1960to 1980 with the temperature and salinty as the major indexes. By combining the method of the chustering analysis which approaches T-S diagram with the study of the geographical characteristics in the aea area, it makes a comprehensive analysis of the development in the straeture of the spring water Basses in the sea area off Yaadtai, Weihai and Shidao and its relations with the fishing periods and fishing zones. The resalts show that the variations in the strength and the position shifting of the cold water in the northern Yellow Sea and off Qiagdao as well as the Warm water in the Yellow Sea will greatly affect the time when the fishing period be-gins as well as the shifting of the positions of the fishing zone in spring.展开更多
文摘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.
文摘This paper uses the hydrographic date obtained during the springs from 1960to 1980 with the temperature and salinty as the major indexes. By combining the method of the chustering analysis which approaches T-S diagram with the study of the geographical characteristics in the aea area, it makes a comprehensive analysis of the development in the straeture of the spring water Basses in the sea area off Yaadtai, Weihai and Shidao and its relations with the fishing periods and fishing zones. The resalts show that the variations in the strength and the position shifting of the cold water in the northern Yellow Sea and off Qiagdao as well as the Warm water in the Yellow Sea will greatly affect the time when the fishing period be-gins as well as the shifting of the positions of the fishing zone in spring.
