中文摘要：

着眼于渭河流域径流过程的水文学特征研究与生态环境建设的需要,基于GIS平台,运用Hawths Analysis Tools工具和DFA方法,对渭河干流和两岸主要支流月径流过程的分维数和关联维数、干流的多重分形特点进行了计算研究与特征分析。结果表明,各站的径流波动程度存在差异性,各站的月径流过程均长程相关,渭河南山支流的径流波动程度明显强于北山支流。同一条河流上下游各站的径流过程波动程度用关联维D不能很好的体现出差异性,但可以体现干支流之间的差异性能,而渭河干流月径流过程具有多重分形性。分维数和多重分形可以很好地体现出月径流过程的复杂性。

英文摘要：

This study focuses on the hydrologic nature of runoff process and the needs of ecological and environmental construction of Wei river, and has calculated the fractal dimension and correlation dimension of the monthly runoff process for the main channel and major tributaries of this river, based on GIS and using Hawths Analysis Tools and a DFA method. A multi-fractal analysis of characteristics for three stations of the main river channel is also presented. Results show that the monthly runoffs of all the stations have a feature of long range correlation but there exist differences in flow fluctuation among different stations and the fluctuations in the southern tributaries are stronger than the northern. Correlation dimension shows the fluctuation differences between the main channel and tributaries, but it is unable to disclose the differences among various stations along the same watercourse. It also shows that the monthly runoff of the Wei river main channel has multi-fractal nature. Thus, fractal and multi-fractal can well reflect the complexity of monthly runoff process.