title: [Fractal characteristics of daily discharge in different scales watersheds].
abstract: Based on the fractal theory and the long-term daily discharge records, this paper analyzed the fractal characteristics of daily discharge in mid-scale watershed (Wushui watershed) and small-scale watersheds (Zhenfu and Shuangxi watersheds). Under the same time scales and different threshold values of daily runoff, the fractal characteristics of daily discharge in the watersheds of different spatial scales and of same spatial scales were evident, and existed self-similarity. With the increase of the threshold values of daily runoff, the fractal dimensions of the daily discharge of different space-scale watersheds decreased gradually. The set of fractal dimensions of the daily discharge in different space-scale watersheds tended to be saturated when the time scale was 120-150 days, and the critical threshold values of daily runoff might appear when the time scale exceeded this number of days.
authors.affiliation: College of Water Conservancy & Civil Engineering, China Agricultural University, Beijing 100083, China. 7166zhaohui@163.com
authors.forename: Hui
authors.initials: H
authors.lastname: Zhao
authors.forename: Suo-Yan
authors.initials: SY
authors.lastname: Guo
authors.forename: Ming-Shu
authors.initials: MS
authors.lastname: Xie
authors.forename: Ting-Wu
authors.initials: TW
authors.lastname: Lei
mesh_terms: D002681:China; D003247:Conservation of Natural Resources; D017753:Ecosystem; D004777:Environment; D004784:Environmental Monitoring; D017709:Fractals; D005618:Fresh Water / Q000032:analysis*; D011891:Rain; D045483:Rivers; D014872:Water Movements