摘要
本文在淮河流域洪涝变化分形特征、吸引子维数研究的基础上,以相空间重构为理论,通过Lyaponov指数论证了淮河流域洪涝变化的混沌性和耗散性,分析了洪涝变化的混沌演化特征.
Flood, as a kind of natural disaster, occurs frequently and seriously. Huaihe River Basin, inflenced by monsoon climate and its special landscape, generates flood easily. Flood is one of the most important factors impacting on social stability and economic development in the Basin.Following the forgoing work about the fractal features and strange attractor dimension of the flood series in Huaihe River Basin, this paper analyses the chaotic evolution of the flood series with Lyaponov exponents. Lyaponov exponents reflect the divergence or convergence of a dynamic system evolution nearby trajectories in phase-space reconstruction. So, if the system is chaotic, one Lyaponov exponent must be positive. If the system is dissipative, the sum of all Lyaponov exponents should be less than zero. The research shows that the system of the flood series in Huaihe River Basin is a chaotic system. It follows the endlessly diverge and converge chaotic evolution process. Furthermore, the chaotic system. of the flood series in Huaihe River Basin has dissipative structure from the value and trend of Lyaponov exponents.
出处
《地球信息科学学报》
CSCD
1999年第2期7-11,共5页
Journal of Geo-information Science
