基于分形理论的汉江中下游流域径流特性分析

为了从整体上全面、科学地描述汉江中下游流域径流特性，根据中下游主要干、支流水文站的年、月径流数据，通过 ArcGIS 工作平台计算分析了各站年、 月径流分维数，并基于分形理论研究了径流过程线的形态特征。结果表明：月径流过程线可看作是一种分形，其变化的复杂程度可用分维数表征，径流调节能力较强的大流域分维数小于小流域。由于水库调蓄作用，丹江口水库建成后分维数小于建库前。相距较近的流域所处 气候、下垫面条件相同，其分维一致性较好。

Analysis on runoff characteristics of middle and lower reaches of Hanjiang River Basin based on fractal theory

To describe the runoff characteristics of the middle and lower reaches of Hanjiang River Basin comprehensively and scientifically, according to the annual and monthly runoff data of the hydrological stations on the mainstream and main tributaries, the fractal dimensions of the annual and monthly runoff are calculated and analyzed through ArcGIS platform and the morphological characteristics of the runoff process curves are also analyzed based on fractal theory. The results are as follows: the runoff process curves could be regarded as a phenomenon of fractal and its complexity level could be represented by fractal value; the fractal dimension of larger basins with strong regulating capacity is smaller than that of the smaller basin; the fractal dimension after the completion of Danjiangkou Reservoir is smaller than that before the completion; the fractal dimensions of river basins that are close geographically and with similar climate and underlying surface conditions are consistent. 