关键词: 长江, 岸线, 岛屿, 分形

Abstract: According to the fractal theory, the appropriate methods are used to compute the fractal dimensions of bankline and spatial distribution of island with aid of GIS and RS in five different years i e,1969,1985,1994,1997 and 2002. The parameters to compute the fractal dimensions used in this study include grid and areaperimeter. The software used in the study mainly includes Arc/Info, ArcView andSPLUS. According to the result and analysis, some meaningful conclusions are drawn as follows:First, there exits fractal characteristics, and the change of fractal dimensions shows the stability degree of banklines of the Yangtze River and islands located in the Yangtze River; Second, there exits some correlation between the fractal dimension and the number of islands. But the quantitative relation determined because of nonenough samples.Third, the length of bankline of the Yangtze River is not certain.Fourth, some things about bankline, including development and management of bankline and bracer engineering of the Yangtze River bank impact the stability degree of banklines to a some extent.

Key words: the Yangtze River, bankline, island fractal