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Comparative Study on Fractal Dimensions of River Basins in China at Different Map Scales

HE Gang,CAI Yun-Long(Department of Resources,Environmental Geosciences,Peking University,Beijing 100871)  
Fractal theory,which has already been widely used in various fields,provided new tools in geographical studies especially the scale issues.Fractal theory is used in this paper to study the fractal character of China's river basins at 1∶4 500 000 and 1∶12 000 000 scales respectively,and the relation between the fractal character of the two scales is analyzed accordingly.Some significant conclusions are drawn as follows:(1) The objective existence of fractal character of the river basins in China is approved again within larger scale.(2) The calculation and comparison of fractal dimensions of China's river basins show that the fractal rule in one scale also exists in other scales.(3) The larger the scale is,the bigger the calculated fractal dimension is,and the same trend is also seen in different hierarchy of river basins at different scales.
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